UIPageControl -- View's not changing on click of dots - iphone

I'm using pageControl in my application. View's are not changing on click on dots but on the either end's of pageControl, when i click view's are changing. I want them to change on clicks on dot. What to do? Is there any method i need to implement?
Here's the Code
#import "ScrollingViewController.h"
#implementation ScrollingViewController
#synthesize scrollView;
#synthesize pageControl;
- (void)viewDidLoad
{
[super viewDidLoad];
[self setupPage];
pageControl =[[UIPageControl alloc] initWithFrame:CGRectMake(0,390,320,100)];
pageControl.userInteractionEnabled =YES;
pageControl.numberOfPages = 5;
pageControl.currentPage = 0;
[self.pageControl setBackgroundColor:[UIColor blackColor]];
pageControl.enabled = TRUE;
[pageControl setHighlighted:YES];
[pageControl addTarget:self action:#selector(changePage:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:pageControl];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload
{
[scrollView release];
[pageControl release];
}
- (void)dealloc
{
[super dealloc];
}
- (void)setupPage
{
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0,320,400)];
[scrollView setContentSize:CGSizeMake(1000, 800)];
//scrollView.contentSize = CGSizeMake(1000,800);
scrollView.scrollsToTop = NO;
[self.scrollView setBackgroundColor:[UIColor blackColor]];
[scrollView setCanCancelContentTouches:NO];
scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView.clipsToBounds = YES;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
NSUInteger nimages = 0;
CGFloat cx = 0;
for (; ; nimages++)
{
NSString *imageName = [NSString stringWithFormat:#"image%d.jpg", (nimages + 1)];
UIImage *image = [UIImage imageNamed:imageName];
if (image == nil)
{
break;
}
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect rect = imageView.frame;
rect.size.height = image.size.height;
rect.size.width = image.size.width;
rect.origin.x = ((scrollView.frame.size.width - image.size.width) / 2) + cx;
rect.origin.y = ((scrollView.frame.size.height - image.size.height) / 2);
imageView.frame = rect;
[scrollView addSubview:imageView];
[imageView release];
cx += scrollView.frame.size.width;
}
self.pageControl.numberOfPages = nimages;
[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];
scrollView.delegate = self;
[self.view addSubview:scrollView];
}
- (void)scrollViewDidScroll:(UIScrollView *)_scrollView
{
if (pageControlIsChangingPage)
{
return;
}
CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView
{
pageControlIsChangingPage = NO;
}
- (IBAction)changePage:(id)sender
{
/*
* Change the scroll view
*/
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * pageControl.currentPage;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];
pageControlIsChangingPage = YES;
}
#end

Increase the width of the page control as much as possible. Even if you keep the width of page control short enough to as many dots that it cannot hold, it can show them. But fails to receive the action.

Use in ScrollView.m
#pragma mark -
#pragma mark loadGalleryView
-(void) loadGalleryView{
galleryArr = [memberDic objectForKey:#"arrKey"];
if ([galleryArr count]%5 != 0)
{
noOfPages = ([galleryArr count]/5)+1;
}
else
{
noOfPages = [galleryArr count]/5;
}
viewControllers = [[NSMutableArray alloc] init];
for (int i=0; i<noOfPages; i++)
{
[viewControllers addObject:[NSNull null]];
}
[galleryScrollView setPagingEnabled:TRUE];
[galleryScrollView setContentSize:CGSizeMake(self.view.frame.size.width* noOfPages,69.0f)];
[galleryScrollView setShowsHorizontalScrollIndicator:FALSE];
[galleryScrollView setShowsVerticalScrollIndicator:FALSE];
[galleryScrollView setScrollsToTop:FALSE];
[galleryScrollView setDelegate:self];
[pageControl setNumberOfPages:noOfPages];
[pageControl setCurrentPage:0];
[self loadScrollViewWithPage:0];
[self loadScrollViewWithPage:1];
}
//-----------------Load scroll View----------------------------------
-(void) loadScrollViewWithPage:(int) page{
if (page < 0)
{
return;
}
if (page >= noOfPages)
{
return;
}
GalleryViewController *givc = [viewControllers objectAtIndex:page];
if ((NSNull *)givc == [NSNull null])
{
givc = [[GalleryViewController alloc] initWithPageNumber:page];
givc.imageArr = [galleryArr retain];
[viewControllers replaceObjectAtIndex:page withObject:givc];
[givc release];
}
if (nil == givc.view.superview)
{
CGRect frame = self.view.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0.0f;
givc.view.frame = frame;
[galleryScrollView addSubview:givc.view];
}
}
- (void)scrollViewDidScroll:(UIScrollView *)sender {
// We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
// which a scroll event generated from the user hitting the page control triggers updates from
// the delegate method. We use a boolean to disable the delegate logic when the page control is used.
// Switch the indicator when more than 50% of the previous/next page is visible
CGFloat pageWidth = galleryScrollView.frame.size.width;
int page = floor((galleryScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
// load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];
// A possible optimization would be to unload the views+controllers which are no longer visible
}
// At the end of scroll animation, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
isPageControlUsed = NO;
}
Use in GalleryView .m
- (void)viewDidLoad {
[super viewDidLoad];
float x = 7.0f;
for (int i = (pageNumber*5); i<(pageNumber+1)*5; i++)
{
if (i<[imageArr count])
{
NSString *url = [imageArr objectAtIndex:i];
MyImageView *imgView = [[MyImageView alloc] initWithFrame:CGRectMake(x, 7.5f, 55.0f, 55.0f)];
[imgView addImageFrom:url];
[self.view addSubview:imgView];
[imgView release];
x = x+62.5f;
}
}
}
-(id)initWithPageNumber:(int) page{
if (self = [super initWithNibName:#"GalleryViewController" bundle:nil])
{
pageNumber = page;
}
return self;
}

Related

How to Drag an Image with Gesture Recognition Xcode

I have made a little test to drag views in a UIScrollView to UIView where I can call any action.
I'm trying to be able to make the image I made in the UIScrollView Draggable. I have not been able to make this work.
I was able to create test views which are not images that are able to drag.
TestViewController.h
#import "JDDroppableView.h"
#interface TestViewController : UIViewController <JDDroppableViewDelegate>
{
UIScrollView* mScrollView;
UIView* mDropTarget;
UIImageView *images;
UIImageView *image;
CGPoint mLastPosition;
}
- (void) relayout;
- (void) addView: (id) sender;
- (void) scrollToBottomAnimated: (BOOL) animated;
#property (nonatomic, retain) IBOutlet UIImageView *images;
#property (nonatomic, retain) IBOutlet UIImageView *image;
#end
TestViewController.m
#import "TestViewController.h"
#import "JDDroppableView.h"
#import <QuartzCore/QuartzCore.h>
// setup view vars
static NSInteger sDROPVIEW_MARGIN = 3;
static CGFloat sCOUNT_OF_VIEWS_HORICONTALLY = 1.0;
static CGFloat sCOUNT_OF_VIEWS_VERTICALLY = 1.0;
#implementation TestViewController
#synthesize images;
#synthesize image;
- (void)loadView
{
[super loadView];
self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];
// increase viewcount on ipad
if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {
sCOUNT_OF_VIEWS_HORICONTALLY = 0;
sCOUNT_OF_VIEWS_VERTICALLY = 0;
}
// add button
UIButton* button = [UIButton buttonWithType: UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:#"002.jpg"] forState:UIControlStateNormal];
button.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
[button setTitle: #"+" forState: UIControlStateNormal];
[button addTarget: self action: #selector(addView:) forControlEvents: UIControlEventTouchUpInside];
button.backgroundColor = [UIColor colorWithRed: 0.75 green: 0.2 blue: 0 alpha: 1.0];
button.layer.cornerRadius = 5.0;
button.showsTouchWhenHighlighted = YES;
button.adjustsImageWhenHighlighted = YES;
button.frame = CGRectMake(20,
self.view.frame.size.height - 52,
self.view.frame.size.width - 40, // width
32); // height
[self.view addSubview: button];
// drop target
mDropTarget = [[UIView alloc] init];
mDropTarget.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
mDropTarget.backgroundColor = [UIColor orangeColor];
mDropTarget.frame = CGRectMake(0, 0, 30, 30);
mDropTarget.center = CGPointMake(self.view.frame.size.width/2, button.frame.origin.y - 50);
mDropTarget.layer.cornerRadius = 15;
[self.view addSubview: mDropTarget];
[mDropTarget release];
// scrollview
mScrollView = [[UIScrollView alloc] init];
mScrollView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
mScrollView.backgroundColor = [UIColor colorWithRed: 0.75 green: 0.2 blue: 0 alpha: 1.0];
mScrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
mScrollView.scrollIndicatorInsets = UIEdgeInsetsMake(5, 5, 5, 5);
mScrollView.contentInset = UIEdgeInsetsMake(6, 6, 6, 6);
mScrollView.layer.cornerRadius = 5.0;
mScrollView.frame = CGRectMake(20,20, self.view.frame.size.width - 40, mDropTarget.center.y - 70);
mScrollView.userInteractionEnabled = NO;
mScrollView.canCancelContentTouches = NO;
[self.view addSubview: mScrollView];
[mScrollView release];
// animate some draggable views in
int numberOfViews = sCOUNT_OF_VIEWS_HORICONTALLY*floor(sCOUNT_OF_VIEWS_VERTICALLY) + 2;
CGFloat animationTimePerView = 0.15;
for (int i = 0; i < numberOfViews; i++) {
[self performSelector: #selector(addView:) withObject: nil afterDelay: i*animationTimePerView];
if (i%(int)sCOUNT_OF_VIEWS_HORICONTALLY==0) {
[self performSelector: #selector(scrollToBottomAnimated:) withObject: [NSNumber numberWithBool: YES] afterDelay: i*animationTimePerView];
}
}
CGRect myImageRect = CGRectMake(0, 0, 320, 100);
image = [[UIImageView alloc] initWithFrame:myImageRect];
[image setImage:[UIImage imageNamed:#"002.jpg"]];
[image setUserInteractionEnabled:YES];
[self.view addSubview:image];
[mScrollView addSubview:image];
// reenable userinteraction after animation ended
[mScrollView performSelector: #selector(setUserInteractionEnabled:) withObject: [NSNumber numberWithBool: YES] afterDelay: numberOfViews*animationTimePerView];
}
#pragma layout
- (void) relayout
{
// cancel all animations
[mScrollView.layer removeAllAnimations];
for (UIView* subview in mScrollView.subviews)
[subview.layer removeAllAnimations];
// setup new animation
[UIView beginAnimations: #"drag" context: nil];
// init calculation vars
float posx = 0;
float posy = 0;
CGRect frame = CGRectZero;
mLastPosition = CGPointMake(0, -100);
CGFloat contentWidth = mScrollView.contentSize.width - mScrollView.contentInset.left - mScrollView.contentInset.right;
// iterate through all subviews
for (UIView* subview in mScrollView.subviews)
{
// ignore scroll indicators
if (!subview.userInteractionEnabled) {
continue;
}
// create new position
frame = subview.frame;
frame.origin.x = posx;
frame.origin.y = posy;
// update frame (if it did change)
if (frame.origin.x != subview.frame.origin.x ||
frame.origin.y != subview.frame.origin.y) {
subview.frame = frame;
}
// save last position
mLastPosition = CGPointMake(posx, posy);
// add size and margin
posx += frame.size.width + sDROPVIEW_MARGIN;
// goto next row if needed
if (posx > mScrollView.frame.size.width - mScrollView.contentInset.left - mScrollView.contentInset.right)
{
posx = 0;
posy += frame.size.height + sDROPVIEW_MARGIN;
}
}
// fix last posy for correct contentSize
if (posx != 0) {
posy += frame.size.height;
} else {
posy -= sDROPVIEW_MARGIN;
}
// update content size
mScrollView.contentSize = CGSizeMake(contentWidth, posy);
[UIView commitAnimations];
}
- (void) addView: (id) sender
{
CGFloat contentWidth = mScrollView.frame.size.width - mScrollView.contentInset.left - mScrollView.contentInset.right;
CGFloat contentHeight = mScrollView.frame.size.height - mScrollView.contentInset.top;
CGSize size = CGSizeMake(((contentWidth-sDROPVIEW_MARGIN*(sCOUNT_OF_VIEWS_HORICONTALLY-1))/sCOUNT_OF_VIEWS_HORICONTALLY),
floor((contentHeight-sDROPVIEW_MARGIN*(sCOUNT_OF_VIEWS_VERTICALLY-1))/sCOUNT_OF_VIEWS_VERTICALLY));
JDDroppableView * dropview = [[JDDroppableView alloc] initWithDropTarget: mDropTarget];
dropview.backgroundColor = [UIColor blackColor];
dropview.layer.cornerRadius = 3.0;
dropview.frame = CGRectMake(mLastPosition.x, mLastPosition.y, size.width, size.height);
dropview.delegate = self;
[mScrollView addSubview: dropview];
[dropview release];
[self relayout];
// scroll to bottom, if added manually
if ([sender isKindOfClass: [UIButton class]]) {
[self scrollToBottomAnimated: YES];
}
}
- (void) scrollToBottomAnimated: (BOOL) animated
{
[mScrollView.layer removeAllAnimations];
CGFloat bottomScrollPosition = mScrollView.contentSize.height;
bottomScrollPosition -= mScrollView.frame.size.height;
bottomScrollPosition += mScrollView.contentInset.top;
bottomScrollPosition = MAX(-mScrollView.contentInset.top,bottomScrollPosition);
CGPoint newOffset = CGPointMake(-mScrollView.contentInset.left, bottomScrollPosition);
if (newOffset.y != mScrollView.contentOffset.y) {
[mScrollView setContentOffset: newOffset animated: animated];
}
}
#pragma -
#pragma droppabe view delegate
- (BOOL) shouldAnimateDroppableViewBack: (JDDroppableView *)view wasDroppedOnTarget: (UIView *)target
{
[self droppableView: view leftTarget: target];
CGRect frame = view.frame;
frame.size.width *= 0.3;
frame.size.height *= 0.3;
frame.origin.x += (view.frame.size.width-frame.size.width)/2;
frame.origin.y += (view.frame.size.height-frame.size.height)/2;
[UIView beginAnimations: #"drag" context: nil];
[UIView setAnimationDelegate: view];
[UIView setAnimationDidStopSelector: #selector(removeFromSuperview)];
view.frame = frame;
view.center = target.center;
[UIView commitAnimations];
[self relayout];
[mScrollView flashScrollIndicators];
return NO;
}
- (void) droppableViewBeganDragging:(JDDroppableView *)view
{
[UIView beginAnimations: #"drag" context: nil];
view.backgroundColor = [UIColor colorWithRed: 1 green: 0.5 blue: 0 alpha: 1];
view.alpha = 0.8;
[UIView commitAnimations];
}
- (void) droppableView:(JDDroppableView *)view enteredTarget:(UIView *)target
{
target.transform = CGAffineTransformMakeScale(1.5, 1.5);
target.backgroundColor = [UIColor greenColor];
// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"image Collided"
// message:#"FuckYea"
// delegate:nil
// cancelButtonTitle:#"Reset!"
// otherButtonTitles:nil];
//[alert show];
CGRect myImageRect = CGRectMake(0, 0, 320, 100);
images = [[UIImageView alloc] initWithFrame:myImageRect];
[images setImage:[UIImage imageNamed:#"002.jpg"]];
[self.view addSubview:images];
}
- (void) droppableView:(JDDroppableView *)view leftTarget:(UIView *)target
{
target.transform = CGAffineTransformMakeScale(1.0, 1.0);
target.backgroundColor = [UIColor orangeColor];
}
- (void) droppableViewEndedDragging:(JDDroppableView *)view
{
[UIView beginAnimations: #"drag" context: nil];
view.backgroundColor = [UIColor blackColor];
view.alpha = 1.0;
[UIView commitAnimations];
}
#end
JDDroppableView.h
#class JDDroppableView;
#protocol JDDroppableViewDelegate <NSObject>
#optional
- (void) droppableViewBeganDragging: (JDDroppableView*) view;
- (void) droppableViewDidMove: (JDDroppableView*) view;
- (void) droppableView: (JDDroppableView*) view enteredTarget: (UIView*) target;
- (void) droppableView: (JDDroppableView*) view leftTarget: (UIView*) target;
- (BOOL) shouldAnimateDroppableViewBack: (JDDroppableView*) view wasDroppedOnTarget: (UIView*) target;
- (void) droppableViewEndedDragging: (JDDroppableView*) view;
#end
#interface JDDroppableView : UIView
{
UIView * mDropTarget;
UIView * mOuterView;
UIScrollView * mScrollView;
BOOL mIsDragging;
BOOL mIsOverTarget;
CGPoint mOriginalPosition;
}
#property (nonatomic, assign) id<JDDroppableViewDelegate> delegate;
- (id) initWithFrame:(CGRect)frame;
- (id) initWithDropTarget:(UIView*)target;
#end
JDDroppableView.m
#import "JDDroppableView.h"
#interface JDDroppableView (hidden)
- (void) beginDrag;
- (void) dragAtPosition: (UITouch *) touch;
- (void) endDrag;
- (void) changeSuperView;
- (BOOL) handleDroppedView;
#end
#implementation JDDroppableView
#synthesize delegate = _delegate;
- (id)init
{
return [self initWithFrame: [UIApplication sharedApplication].keyWindow.frame];
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
mIsDragging = NO;
mIsOverTarget = NO;
}
return self;
}
- (id) initWithDropTarget: (UIView *) target;
{
self = [self init];
if (self != nil) {
mDropTarget = target;
}
return self;
}
#pragma mark touch handling
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self beginDrag];
[self dragAtPosition: [touches anyObject]];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[self dragAtPosition: [touches anyObject]];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self endDrag];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[self endDrag];
}
#pragma mark dragging logic
- (void) beginDrag
{
mIsDragging = YES;
if ([_delegate respondsToSelector: #selector(droppableViewBeganDragging:)]) {
[_delegate droppableViewBeganDragging: self];
};
mOriginalPosition = self.center;
[self changeSuperView];
}
- (void) dragAtPosition: (UITouch *) touch
{
[UIView beginAnimations: #"drag" context: nil];
self.center = [touch locationInView: self.superview];
[UIView commitAnimations];
if ([_delegate respondsToSelector: #selector(droppableViewDidMove:)]) {
[_delegate droppableViewDidMove:self];
}
if (mDropTarget) {
CGRect intersect = CGRectIntersection(self.frame, mDropTarget.frame);
if (intersect.size.width > 10 || intersect.size.height > 10)
{
if (!mIsOverTarget)
{
mIsOverTarget = YES;
if ([_delegate respondsToSelector: #selector(droppableView:enteredTarget:)]) {
[_delegate droppableView: self enteredTarget: mDropTarget];
}
}
}
else if (mIsOverTarget)
{
mIsOverTarget = NO;
if ([_delegate respondsToSelector: #selector(droppableView:leftTarget:)]) {
[_delegate droppableView: self leftTarget: mDropTarget];
}
}
}
}
- (void) endDrag
{
mIsOverTarget = NO;
if([_delegate respondsToSelector: #selector(droppableViewEndedDragging:)]) {
[_delegate droppableViewEndedDragging: self];
}
if (mDropTarget) {
CGRect intersect = CGRectIntersection(self.frame, mDropTarget.frame);
if (intersect.size.width > 10 || intersect.size.height > 10) {
if([self handleDroppedView]) {
mIsDragging = NO;
return;
}
}
}
[self changeSuperView];
mIsDragging = NO; // this needs to be after superview change
[UIView beginAnimations: #"drag" context: nil];
self.center = mOriginalPosition;
[UIView commitAnimations];
}
- (BOOL) handleDroppedView
{
if (mDropTarget && [_delegate respondsToSelector: #selector(shouldAnimateDroppableViewBack:wasDroppedOnTarget:)]) {
return ![_delegate shouldAnimateDroppableViewBack: self wasDroppedOnTarget: mDropTarget];
}
return NO;
}
#pragma mark superview handling
- (void)willMoveToSuperview:(id)newSuperview
{
if (!mIsDragging && [newSuperview isKindOfClass: [UIScrollView class]]) {
mScrollView = newSuperview;
mOuterView = mScrollView.superview;
}
}
- (void) changeSuperView
{
if (!mScrollView) {
[self.superview bringSubviewToFront: self];
return;
}
UIView * tmp = self.superview;
[self removeFromSuperview];
[mOuterView addSubview: self];
mOuterView = tmp;
// set new position
CGPoint ctr = self.center;
if (mOuterView == mScrollView) {
ctr.x += mScrollView.frame.origin.x - mScrollView.contentOffset.x;
ctr.y += mScrollView.frame.origin.y - mScrollView.contentOffset.y;
} else {
ctr.x -= mScrollView.frame.origin.x - mScrollView.contentOffset.x;
ctr.y -= mScrollView.frame.origin.y - mScrollView.contentOffset.y;
}
self.center = ctr;
}
#end
AppDelegate.h
#interface AppDelegate : UIResponder <UIApplicationDelegate>
{
UIWindow* mWindow;
TestViewController* mViewController;
}
#end
AppDelegate.m
#import "AppDelegate.h"
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
mWindow = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
mWindow.backgroundColor = [UIColor whiteColor];
TestViewController* viewController = [[TestViewController alloc] init];
[mWindow addSubview: viewController.view];
[mWindow makeKeyAndVisible];
return YES;
}
- (void)dealloc
{
[mWindow release];
[mViewController release];
[super dealloc];
}
#end
Any help is much appreciated.
Thank you.
According to Apple's documentation
New image view objects are configured to disregard user events by
default. If you want to handle events in a custom subclass of
UIImageView, you must explicitly change the value of the
userInteractionEnabled property to YES after initializing the object.
You need to set userInteractionEnabled to YES on your UIImageView like this:
[image setUserInteractionEnabled:YES];
Hope this help.
You posted the complete example code of https://github.com/jaydee3/JDDroppableView/.
Perhaps you just ask a single question and refer to the project. But to use it for UIImageViews, you need to alloc init a JDDroppableView and put your imageView on it.
UIImageView *imageView = [[UIImageView alloc] initWithImage:...];
imageView.autoresizingMask = UIAutoresizingFlexibleWidth | UIAutoresizingFlexibleHeight;
JDDroppableView *droppableView = [[JDDroppableView alloc] initWithFrame:imageView.bounds];
[droppableView addSubview:imageView];

Why does my survey app make memory leak? (Multiple UIViews and UITextViews in one UIScrollView)

I am trying to make a survey app but I can't make the memory management although I am using ARC. My app makes memory leak. I get memory warning. When I make my app in interface builder statically there is no problem but when i make my app programmatically I get memory problem. Why is that happening? Here is my code:
#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>
int soruAdedi = 20;
#interface ViewController ()
#end
#implementation ViewController
#synthesize scrollView2;
-(void)textViewBicimle: (UITextField *)textAlani{
[textAlani.layer setBorderColor:[[[UIColor blackColor] colorWithAlphaComponent:1.0] CGColor]];
[textAlani.layer setBorderWidth:1.0];
}
- (void) tableCiz:(NSMutableArray *)hucreler sutun:(int)sutunSayisi satir:(int)satirSayisi{
int z = 0;
for (int i =0;i<satirSayisi;i++){
for(int j=0;j<sutunSayisi&&z<satirSayisi*sutunSayisi;j++,z++){
[self textViewBicimle:[hucreler objectAtIndex:z]];
[[hucreler objectAtIndex:z] setFrame:CGRectMake((20+j*100), (20+i*40), 100, 40)];
}
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
}
-(void)hucreArrayOlustur: (int)sutunSayisi suankiView:(UIView *)soruViewIki satir:(int)satirSayisi{
for (int i = 0; i <sutunSayisi*satirSayisi; i++){
textView = [[UITextField alloc]init];
textView.text = #"dsgfdh";
[hucreArray addObject:textView];
[soruViewIki addSubview:textView];
}
}
-(void)viewOlustur{
for (int i = 0; i <soruAdedi; i++){
hucreArray = [[NSMutableArray alloc]init];
if (i == 0){
soruView = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 728, 0)];
soruView.clipsToBounds = YES;
soruView.backgroundColor = [UIColor lightGrayColor];
[self hucreArrayOlustur:5 suankiView:soruView satir:10];
[self tableCiz:hucreArray sutun:5 satir:10];
CGRect frame = soruView.frame;
CGRect frame2 = [[hucreArray objectAtIndex:49] frame];
frame.size.height = frame2.origin.y+frame2.size.height+34;
soruView.frame = frame;
[viewArray addObject:soruView];
[scrollView2 addSubview:soruView];
}
else{
CGRect frameGecici = [[viewArray objectAtIndex:i-1] frame];
float geciciY = frameGecici.origin.y+frameGecici.size.height+1;
soruView = [[UIView alloc]initWithFrame:CGRectMake(20, geciciY, 728, 0)];
soruView.clipsToBounds = YES;
soruView.backgroundColor = [UIColor lightGrayColor];
[self hucreArrayOlustur:5 suankiView:soruView satir:10];
[self tableCiz:hucreArray sutun:5 satir:10];
CGRect frame = soruView.frame;
CGRect frame2 = [[hucreArray objectAtIndex:49] frame];
frame.size.height = frame2.origin.y+frame2.size.height+34;
soruView.frame = frame;
[viewArray addObject:soruView];
[scrollView2 addSubview:soruView];
}
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
scrollView2.delegate = self;
scrollView2.contentSize = CGSizeMake(0, 8000);
viewArray = [[NSMutableArray alloc]init];
[self viewOlustur];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidUnload {
[self setScrollView2:nil];
[super viewDidUnload];
}
#end

UIScrollView. Page Controller with many UIView inside

I have 2 views are connected with NavigationController. Second view is scrollView with page controll. My main view has 1 UIButton. When pressing on it are obtained 3-4 seconds delay. There are 21 views in scrollView. And I have spurts when scrolling between view in scrollView. How can I reduce delay and remove spurts?
My viewDidLoad method:
-(void)viewDidLoad {
self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0.0f, 280.0f, 320.0f, 20.0f)];
[self.view addSubview:self.pageControl];
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f, 30.0f, 480.0f, 250.0f)];
[self.view addSubview:self.scrollView];
pageControlBeingUsed = NO;
NSInteger firstNumber = 1;
for (NSUInteger i = 0; i < 20; i++) {
BIDExercisePrototype *view = [[BIDExercisePrototype alloc] initWithNumber:firstNumber];
[self.viewsArray addObject:view];
firstNumber += 50;
}
for (NSUInteger i = 0; i < 20; i++) {
UIViewController *someController = [[UIViewController alloc] init];
someController = [self.viewsArray objectAtIndex:i];
someController.view.frame = CGRectMake(480.0f*i, 0.0f, 480.0f, 280.0f);
[self.scrollView addSubview:someController.view];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * self.viewsArray.count, self.scrollView.frame.size.height);
self.pageControl.backgroundColor = [UIColor clearColor];
self.pageControl.currentPage = 0;
self.pageControl.numberOfPages = self.viewsArray.count;
self.scrollView.showsVerticalScrollIndicator = NO;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.pagingEnabled = YES;
self.scrollView.delegate = self;
[self.pageControl addTarget:self action:#selector(changePage) forControlEvents:UIControlEventValueChanged];
}
- (void)scrollViewDidScroll:(UIScrollView *)sender {
if (!pageControlBeingUsed) {
CGFloat pageWidth = self.scrollView.frame.size.width;
int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
self.pageControl.currentPage = page;
}
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
pageControlBeingUsed = NO;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
pageControlBeingUsed = NO;
}
- (void)changePage {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
[self.scrollView scrollRectToVisible:frame animated:YES];
pageControlBeingUsed = YES;
}
I think you should be able to follow the same practice for improving UITableView's scroll performance.
Do your drawing manually and have only one view in each cell.
Check out the following SO post which discusses multiple ways to improve scrolling performance by rendering your cells in specific ways.
Tricks for improving iPhone UITableView scrolling performance?
May I suggest you forget about recoding the wheel (so to speak) and use existing projects that have already solved the problems

Zooming problem in UIScrollView

I am using UIScrollView.In that scrollview I placing UIImageViews in serial order.Zooming is not working .This is my code
- (void)viewDidLoad
{
self.view.backgroundColor=[UIColor blackColor];
NSArray *imageArray=[[NSArray alloc]initWithObjects:[UIImage imageNamed:#"test1.png"],[UIImage imageNamed:#"test2.png"],[UIImage imageNamed:#"test3.png"], nil];
scrollView_=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width+20, self.view.frame.size.height)];
[scrollView_ setCanCancelContentTouches:NO];
scrollView_.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView_.clipsToBounds = NO;
scrollView_.scrollEnabled = YES;
scrollView_.pagingEnabled = YES;
scrollView_.delegate=self;
scrollView_.showsHorizontalScrollIndicator=NO;
scrollView_.showsVerticalScrollIndicator=NO;
scrollView_.contentSize = CGSizeMake([imageArray count]*self.scrollView_.frame.size.width, self.scrollView_.frame.size.height);
[scrollView_ setMaximumZoomScale:3.0];
[scrollView_ setMinimumZoomScale:1];
[scrollView_ setZoomScale:1];
[scrollView_ setBouncesZoom:YES];
[scrollView_ setBounces:YES];
for(int i=0;i<[imageArray count];i++)
{
UIImageView *imageView=[[UIImageView alloc]initWithImage:[imageArray objectAtIndex:i]];
imageView.frame=CGRectMake((i*320)+(i*20), 0, 320, 480);
[imageView_ setTag:i];
[scrollView_ addSubview:imageView];
[imageView release];
}
[self.view addSubview:scrollView_];
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return [scrollView_ viewWithTag:page_];
}
- (void)scrollViewDidScroll:(UIScrollView *)_scrollView
{
CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
self.page_=page;
}
Thanks in advance..
Where have you set -
[self.mainScroll setZoomScale:(float)];
I guess by default this is 1. So no zoom happens...
Create a container view, and add imageViews into the container view,
then use the container view as zoomview.
- viewDidLoad {
// ---
self.containerView =[[[UIView alloc] init] autorelease];
self.containerView.frame = CGRectMake(0, 0, [imageArray count]*self.scrollView_.frame.size.width, self.scrollView_.frame.size.height);
[scrollView_ addSubView:self.containerView];
for(int i=0;i<[imageArray count];i++)
{
UIImageView *imageView=[[UIImageView alloc]initWithImage:[imageArray objectAtIndex:i]];
imageView.frame=CGRectMake((i*320)+(i*20), 0, 320, 480);
[imageView_ setTag:i];
[self.containerView addSubview:imageView];
[imageView release];
}
// --
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.containerView;
}

scrollView with pagecontrol programmatically?

I want to create scrollView with pagecontrol programmatically. How can i do that?
#pragma mark -
#pragma mark loadGalleryView
-(void) loadGalleryView{
galleryArr = [memberDic objectForKey:#"arrKey"];
if ([galleryArr count]%5 != 0)
{
noOfPages = ([galleryArr count]/5)+1;
}
else
{
noOfPages = [galleryArr count]/5;
}
viewControllers = [[NSMutableArray alloc] init];
for (int i=0; i<noOfPages; i++)
{
[viewControllers addObject:[NSNull null]];
}
[galleryScrollView setPagingEnabled:TRUE];
[galleryScrollView setContentSize:CGSizeMake(self.view.frame.size.width* noOfPages,69.0f)];
[galleryScrollView setShowsHorizontalScrollIndicator:FALSE];
[galleryScrollView setShowsVerticalScrollIndicator:FALSE];
[galleryScrollView setScrollsToTop:FALSE];
[galleryScrollView setDelegate:self];
[pageControl setNumberOfPages:noOfPages];
[pageControl setCurrentPage:0];
[self loadScrollViewWithPage:0];
[self loadScrollViewWithPage:1];
}
//-----------------Load scroll View----------------------------------
-(void) loadScrollViewWithPage:(int) page{
if (page < 0)
{
return;
}
if (page >= noOfPages)
{
return;
}
GalleryViewController *givc = [viewControllers objectAtIndex:page];
if ((NSNull *)givc == [NSNull null])
{
givc = [[GalleryViewController alloc] initWithPageNumber:page];
givc.imageArr = [galleryArr retain];
[viewControllers replaceObjectAtIndex:page withObject:givc];
[givc release];
}
if (nil == givc.view.superview)
{
CGRect frame = self.view.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0.0f;
givc.view.frame = frame;
[galleryScrollView addSubview:givc.view];
}
}
- (void)scrollViewDidScroll:(UIScrollView *)sender {
// We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
// which a scroll event generated from the user hitting the page control triggers updates from
// the delegate method. We use a boolean to disable the delegate logic when the page control is used.
// Switch the indicator when more than 50% of the previous/next page is visible
CGFloat pageWidth = galleryScrollView.frame.size.width;
int page = floor((galleryScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
// load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];
// A possible optimization would be to unload the views+controllers which are no longer visible
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
isPageControlUsed = NO;
}
in gallary View Controller in .m file
- (void)viewDidLoad {
[super viewDidLoad];
float x = 7.0f;
for (int i = (pageNumber*5); i<(pageNumber+1)*5; i++)
{
if (i<[imageArr count])
{
NSString *url = [imageArr objectAtIndex:i];
MyImageView *imgView = [[MyImageView alloc] initWithFrame:CGRectMake(x, 7.5f, 55.0f, 55.0f)];
[imgView addImageFrom:url];
[self.view addSubview:imgView];
[imgView release];
x = x+62.5f;
}
}
}
-(id)initWithPageNumber:(int) page{
if (self = [super initWithNibName:#"GalleryViewController" bundle:nil])
{
pageNumber = page;
}
return self;
}