- (void)viewDidLoad
{
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected:)];
tapGesture.numberOfTapsRequired = 1;
tapGesture.numberOfTouchesRequired = 1;
scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
int numberOfImages = 32;
CGFloat currentX = 0.0f;
for (int i=1; i <= numberOfImages; i++) {
// create image
NSString *imageName = [NSString stringWithFormat:#"page-%d.jpg", i];
UIImage *image = [UIImage imageNamed:imageName];
imageView = [[UIImageView alloc] initWithImage:image];
// put image on correct position
CGRect rect = imageView.frame;
rect.origin.x = currentX;
imageView.frame = rect;
// update currentX
currentX +=454; //mageView.frame.size.width;
[scrollView addSubview:imageView];
[imageView release];
}
[scrollView addGestureRecognizer:tapGesture];
scrollView.contentSize = CGSizeMake(currentX, 800);
scrollView.pagingEnabled=YES;
scrollView.userInteractionEnabled = YES;
scrollView.maximumZoomScale = 15;
scrollView.minimumZoomScale = 0.5;
scrollView.bounces = NO;
scrollView.bouncesZoom = NO;
scrollView.delegate = self;
scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
[self.view addSubview:scrollView];
[scrollView release];
[super viewDidLoad];
}
}
in above code when i apply zoom or tap event with a single image then it work for that. But when same event apply for array of image then not working. why is it happened?
Its quiet complex to implement zoom in this kind of image flow. Anyway i wil suggest you one idea,
Add the gesture to each imageView. In the method, add a new scrollview, with the respective imageView.. then implement zoom.
EDIT:
In the tapgesture method,
1.Find out the which imageView is visible at that time.
2.Then create a new scrollview,with that single imageview.
3.Implement zoom functionality in that new scrollview.
4.During zoom out,If the new scrollview size is equal to the actual value,remove the new scrollview fro the super view so that the array of images is visible.
Simplest way is create a big wrapper view first, and insert it into ScrollView.
And then add all your imageViews to the wrapper view.
Related
I am a beginner in iOS. i have created a UIScrollview with 5 images and set its width, height and size change according to orientation. After adding all 5 images the scroll view subview count is 5. But when start dragging the count increases to 7. I don't know where the blank view is added.
CODE
-(void)addImageWithName:(NSString*)imageString atPosition:(int)position {
UIImage *image = [UIImage imageWithContentsOfFile:imageString];
imageView = [[UIImageView alloc] initWithImage:image];
// imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
imageView.frame = CGRectMake(position*scrollview.frame.size.width*2, 0, scrollview.frame.size.width *2,scrollview.frame.size.height );
imageView.tag = 1000 + position +1;
[scrollview addSubview:imageView];
}
-(void)imageLoad:(NSInteger)startImage
{
int Index = -1;
for (UIImageView *subview in scrollview.subviews)
{
[subview removeFromSuperview];
}
for (int i = startImage; i < startImage+5; i++) {
Index++;
fullPath = [dataPath stringByAppendingString:[NSString stringWithFormat:#"/image%d.jpg",i]];
[self addImageWithName:fullPath atPosition:Index];
scrollview.contentSize = CGSizeMake(i*scrollview.frame.size.width, 0);
}
}
When you start scrolling, the scrollbar views are added temporarily as subviews.
I followed the tutorial about how to create a scrollView Page Control: http://www.iosdevnotes.com/2011/03/uiscrollview-paging/
This tutorial is really good and I implement well the code. Here my question:
I want to put a space between the my PageViews, but when it change the page it show the space between the views in the next page. The scroll must stop after the space when I change the page.
I changed the tutorial code here:
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *colors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor blueColor], nil];
#define space 20
for (int i = 0; i < colors.count; i++) {
CGRect frame;
frame.origin.x = (self.scrollView.frame.size.width + space) * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.
UIView *subview = [[UIView alloc] initWithFrame:frame];
subview.backgroundColor = [colors objectAtIndex:i];
[self.scrollView addSubview:subview];
[subview release];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * colors.count+ space*(colors.count-1), self.scrollView.frame.size.height);
}
It sounds like you want a “gutter” between the pages, so that each page fills the scroll view and the gutter is only visible while the user is dragging the view. The built-in Photos app does this, for example.
Make your scroll view wider by space points. For example, if you want the scroll view to appear to be as wide as the screen (320 points), with a 20 point margin between items, then make the scroll view 340 points wide, with the extra 20 points hanging off the right edge of the screen.
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *colors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor blueColor], nil];
#define kGutterWidth 20
UIScrollView *scrollView = self.scrollView;
CGRect scrollViewFrame = scrollView.frame;
scrollViewFrame.size.width += kGutterWidth;
scrollView.frame = scrollViewFrame;
CGSize scrollViewSize = scrollView.bounds.size;
for (int i = 0; i < colors.count; i++) {
CGRect frame = CGRectMake(scrollViewSize.width * i, 0,
scrollViewSize.width - kGutterWidth, scrollViewSize.height);
UIView *subview = [[UIView alloc] initWithFrame:frame];
subview.backgroundColor = [colors objectAtIndex:i];
[scrollView addSubview:subview];
[subview release];
}
scrollView.contentSize = CGSizeMake(
colors.count * scrollViewSize.width,
scrollViewSize.height);
}
I've been down this road before, and I would advise laying out the scroll view as the tutorial code recommends, with no space between the subviews.
Instead, give each subview another subview whose frame is inset from it's parent...
CGRect scrollViewFrame = self.scrollView.frame;
for (int i=0; i<colors.count; i++) {
CGRect frame = CGRectMake(scrollViewFrame.size.width * i, 0, scrollViewFrame.size.width, scrollViewFrame.size.height);
// this will be our framing view, full size with no gaps
UIView *subview = [[UIView alloc] initWithFrame:frame];
subview.backgroundColor = [UIColor whiteColor];
// here's the trick - use CGRectInset on the framing view's bounds
UIView *colorView = [[UIView alloc] initWithFrame:CGRectInset(subview.bounds, 10, 10)];
colorView.backgroundColor = [colors objectAtIndex:i];
[subview addSubview:colorView];
[self.scrollView addSubview:subview];
// aren't you using ARC? your tutorial is probably older than ARC
// would strongly suggest converting to ARC
[subview release];
[colorView release];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * colors.count, self.scrollView.frame.size.height);
The benefit of this approach is that the math for the top level subview layout remains a simple multiple of the width. The only place you'll refer to that inset constant is on the CGRectInset where it belongs.
I am trying to Load 5 or 6 remotes images to a scrollview and swipe horizontal. I can get the URLs form my webserver (JSON output) , I'm trying to do this using AFnetworking for performances issues .
so far I can get the URL and load one picture to a UIImageview like this (Using Storyboard )
Jsonobject *items = [posterNSMarray objectAtIndex:0]; //load one url only
NSlog (#"Object url %#", items.pUrl); // picture URL
[self.imageview setImageWithURl :[NSURL URLWithString:items.pUrl] placeholderImage :[UIImage imageNamed:#"placeholder"]];
[EDITED QUESTION]
my question is how do I get all the images and save it to a NSMutableArray
Thanks for your help .
[EDIT]
Based upon your comments below, I might actually choose then a different methodology
Bring in All of your images. At this point you can use either UIImageView or UIButton actually to obtain the tap (from the scrollview) you wish. Assign the UIImages to your choice of UIButton or UIImageView, and the place them on your scrollview as you wish. You will have to dynamically create the actions for each Button or ImageView. Your action creation should then bring up another View to be place atop you scrollview, or another viewcontroller that you animate to, etc... In a View Controller you will have your UIImageView as full screen. At this point you can implement your own UIGestureRecognizers to implement the double taps, etc...
I would use a UIListView. Here is a great link to custom UIListView implementation.
http://cocoawithlove.com/2009/04/easy-custom-uitableview-drawing.html
I would load your images into an NSMutableArray, to be used by the drawing routine of the custom UITableView.
As for swiping, you can capture the swipe events, then you can do with the list items as you please (i.e. delete, edit, etc... from your image array).
Another link:
http://www.icodeblog.com/2009/05/24/custom-uitableviewcell-using-interface-builder/
From your question and comments it seems like you want to load a UIScrollView with multiple images and then swipe through each one. It also sounds like you want to be able to tap one and have it launch a blown up image for the user to view.
I wrote some of these functions for an old project (they are a little rough) but you may be able to use them as they are how I accomplished what I think you were asking.
-(void)setupPictures
{
imageSectionSlider = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, IMAGE_HEIGHT)];
imageSectionSlider.showsVerticalScrollIndicator = NO;
imageSectionSlider.showsHorizontalScrollIndicator = NO;
imageSectionSlider.pagingEnabled = YES;
imageSectionSlider.bounces = NO;
UIView* tilesHolder = [[UIView alloc]initWithFrame:CGRectMake(0, 0, (([[thisStory imageList]count] * (self.frame.size.width))), IMAGE_HEIGHT)];
tilesHolder.userInteractionEnabled = YES;
for (int count = 0; count < [[thisStory imageList]count]; count++)
{
[tilesHolder addSubview:[self createImageTile:[[thisStory imageList]objectAtIndex:count] Count:count Rect:CGRectMake( 320*count , 0, 320, IMAGE_HEIGHT)]];
}
[imageSectionSlider setContentSize:CGSizeMake( tilesHolder.frame.size.width , tilesHolder.frame.size.height)];
[imageSectionSlider addSubview:tilesHolder];
[tilesHolder release];
}
-(UIView*)createImageTile:(ImageItem*)input Count:(int)count Rect:(CGRect)rect
{
UIView* imageTile = [[UIView alloc]initWithFrame:rect];
[imageTile setTag:count];
UIImageView* image = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, imageTile.frame.size.width, imageTile.frame.size.height - 45)];
[image setImage:[input imageData]];
image.contentMode = UIViewContentModeScaleAspectFill;
image.clipsToBounds = YES;
image.userInteractionEnabled = YES;
image.tag = count;
UIGestureRecognizer* featureImageGesRec = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(countTaps:)];
[image addGestureRecognizer:featureImageGesRec];
[featureImageGesRec release];
[imageTile addSubview:image];
[image release];
return [imageTile autorelease];
}
- (void)countTaps:(NSObject*)sender {
tapCount++;
if (tapCount == 1) {
//do something with single tap
}
else if (tapCount == 2)
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
[self doubleTap:sender];
}
}
-(void)doubleTap:(NSObject*)sender
{
UITapGestureRecognizer* item = (UITapGestureRecognizer*)sender;
tapCount = 0;
//FullSizeImage
ImageItem* selectedItem = [[thisStory imageList]objectAtIndex:item.view.tag];
ExpandedView* pictureView = [[ExpandedView alloc]initWithImage:[selectedItem imageData]];
[thisParent.navigationController pushViewController:pictureView animated:YES];
[pictureView release];
}
Just pass your async loaded image here in this line...
[tilesHolder addSubview:[self createImageTile:/*Image*/ Count:count Rect:CGRectMake( 320*count , 0, 320, IMAGE_HEIGHT)]];
if you use AFNetworking Conect, you use Image Request concept :-
try this code:-
- (void)setupPage
{
scrollPage = 0 ;
scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0.0f,0, 320,367)];
[scrollView setBackgroundColor:[UIColor clearColor]];
[scrollView setDelegate:self];
[self.view addSubview:scrollView];
NSUInteger nimages = 0;
CGFloat cx = 0;
CGFloat cy = 0;
for (; nimages < [stealArr count]; nimages++)
{
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f,320.0f,367)];
CGRect rect = imageView.frame;
rect.size.height = 331;
rect.size.width = 320.0f;
rect.origin.y = 0.0f;
rect.origin.x = 0.0f+cx;
imageView.frame = rect;
[imageView setBackgroundColor:[UIColor clearColor]];
imageView.contentMode = UIViewContentModeScaleToFill;
[scrollView addSubview:imageView];
[imageView setImageWithURL:[NSURL URLWithString:#"http://i.imgur.com/r4uwx.jpg"] placeholderImage:[UIImage imageNamed:#"placeholderImage"]];
cx += scrollView.frame.size.width;
cy += scrollView.frame.size.height;
}
pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 331.0f, 320, 36)] ;
[pageControl setCurrentPage:0] ;
[pageControl addTarget: self action: #selector(pageControlClicked:) forControlEvents: UIControlEventValueChanged] ;
[pageControl setDefersCurrentPageDisplay: YES];
[pageControl setBackgroundColor:[UIColor blackColor]];
[self.view addSubview:pageControl];
pageControl.numberOfPages = [stealArr count];
[scrollView setContentSize:CGSizeMake(cx,[scrollView bounds].size.height)];
[scrollView setPagingEnabled:TRUE];
}
when Your are scroll the page
- (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 = scrollView.frame.size.width;
scrollPage = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = scrollPage;
be to unload the views+controllers which are no longer visible
}
for Paging
- (void)pageControlClicked:(id)sender
{
UIPageControl *thePageControl = (UIPageControl *)sender ;
// we need to scroll to the new index
[scrollView setContentOffset: CGPointMake(scrollView.bounds.size.width * thePageControl.currentPage, scrollView.contentOffset.y) animated: YES] ;
}
I am trying to add set of imageviews on a UIScrollView. My problem is that the imageviews are overlapping with each other even though I increase the x value. What's also weird is that this problem is only for devices with ios 4.2.1, but works on simulator 4.2 and other device ios.
Here is my code:
- (void)addScrollView {
[self setImages];
scrollView = [[UIScrollView alloc] initWithFrame:self.frame];
scrollView.delegate = self;
[scrollView setBackgroundColor:[UIColor blackColor]];
[scrollView setCanCancelContentTouches:NO];
scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView.clipsToBounds = YES;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
[self addSubview:scrollView];
NSUInteger nimages;
CGFloat cx = 0;
for (nimages = 1; nimages < [imagesArray count] ; nimages++) {
UIImage *image = [UIImage imageNamed:[imagesArray objectAtIndex:nimages]];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect rect = imageView.frame;
rect.origin.x = cx;
rect.origin.y = 0;
rect.size.width = 320;
rect.size.height = 480;
imageView.frame = rect;
[scrollView addSubview:imageView];
[imageView release];
cx += rect.size.width;
}
[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];
}
Called from here:
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self addScrollView];
UIImage *handImg;
UIImageView *longhand = [[UIImageView alloc] init];
minuteHand = [[UIView alloc] initWithFrame:CGRectMake(0, 55, 320, 480)];
handImg = [UIImage imageNamed:#"clock_long_hand.png"];
longhand.image = handImg;
/************** TRY COMMENT OUT HERE **************/
longhand.frame = CGRectMake(155 - (handImg.size.width / 2), 240 - handImg.size.height, handImg.size.width, handImg.size.height);
[minuteHand addSubview:longhand];
[self addSubview:minuteHand];
/************** END COMMENT OUT HERE **************/
[longhand release];
}
return self;
}
UPDATE:
This code is in a UIView subclass which is why I use [self...] instead of [self.view...].
I tried experimenting and found that when I comment out the indicated parts, the scrollview works fine. But when it is included, this is when the imageviews are overlapped.
I know that the scrollview's content size is correct because its indicator continues to scroll, with just a plain black background.
I am really confused why this works on some ios and not on others. Hope you can help.
This might have something to do with autoresizing mask. The width actual images, I mean .png files is bigger than 320, right?
I need to create a horizontal UIScrollView which to hold hundreds of thumbnail images, just like a slide of thumbnails.
For example, there will be 10 thumbnails showing in a single screen, each of them are horizontally adjacent to each other.
My problem is that I don't know how to make a horizontal UIScrollView to hold the multiple thumbnails which showing at the same time ?
A sample photo is as below. See the bottom part of the screen.
Thanks.
You can add all the thumbnails programatically to your scrollview and use the setContentSize method of UIScrollView. you have to pass 2 values in contentOffset. 1 for width and 1 for height. Please follow link to explore more on this. If you need further help please leave a comment.
Hope it helps.
Please consider Following example.
- (void)setupHorizontalScrollView
{
scrollView.delegate = self;
[self.scrollView setBackgroundColor:[UIColor blackColor]];
[scrollView setCanCancelContentTouches:NO];
scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView.clipsToBounds = NO;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
NSUInteger nimages = 0;
NSInteger tot=0;
CGFloat cx = 0;
for (; ; nimages++) {
NSString *imageName = [NSString stringWithFormat:#"image%d.jpg", (nimages + 1)];
UIImage *image = [UIImage imageNamed:imageName];
if (tot==15) {
break;
}
if (4==nimages) {
nimages=0;
}
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect rect = imageView.frame;
rect.size.height = 40;
rect.size.width = 40;
rect.origin.x = cx;
rect.origin.y = 0;
imageView.frame = rect;
[scrollView addSubview:imageView];
[imageView release];
cx += imageView.frame.size.width+5;
tot++;
}
self.pageControl.numberOfPages = nimages;
[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];
}
I suggest you to look at nimbus
Check out bjhomer's HSImageSidebarView project. It lets you load a scrollview horizontally or vertically and load in the images. Super easy to implement.
First of all, at storyboard drag and drop the scroll view and make the outlet of scrollview named scrollView. Two array one is mutable and one is immutable.
#property(nonatomic,strong)IBOutlet UIScrollView *scrollView;
#property(nonatomic,strong)NSMutableArray *images;
#property(nonatomic,strong)NSArray *imagesName;
The immutable array only store the images which we want to show on the scroll view.Make sure UIscrollview delegate is defined.
In viewcontoller.m file in didload function do following code:
imagesName = [[NSArray alloc]initWithObjects:#"centipede.jpg",#"ladybug.jpg",#"potatoBug.jpg",#"wolfSpider.jpg", #"ladybug.jpg",#"potatoBug.jpg",#"centipede.jpg",#"wolfSpider.jpg",nil];
// mutable array used to show the images on scrollview dynamic becaus after one
// image when scroll other will come
images = [[NSMutableArray alloc]init];
scrollView.delegate = self;
scrollView.scrollEnabled = YES;
int scrollWidth = 120;
scrollView.contentSize = CGSizeMake(scrollWidth,80);
int xOffset = 0;
//the loop go till all images will load
for(int index=0; index < [imagesName count]; index++)
{
UIImageView *img = [[UIImageView alloc] init];
// make the imageview object because in scrollview we need image
img.frame = CGRectMake(5+xOffset, 0, 160, 110);
// the offset represent the values, used so that topleft for each image will
// change with(5+xOffset, 0)and the bottomright(160, 110)
NSLog(#"image: %#",[imagesName objectAtIndex:index]);
img.image = [UIImage imageNamed:[imagesName objectAtIndex:index]];
// The image will put on the img object
[images insertObject:img atIndex:index];
// Put the img object at the images array which is mutable array
scrollView.contentSize = CGSizeMake(scrollWidth+xOffset,110);
//scroll view size show after 125 width the scroll view enabled
[scrollView addSubview:[images objectAtIndex:index]];
// set images on scroll view
xOffset += 170;
}
You can calculate content size width of the scrollview as width = number of images * size of each image. Then set contentSize of the scrollview to this width and the height that you want (scrollView.contentSize = CGSizeMake(width, height))