I don't understand why the scrollview isn't working, because I followed advices from tutorials.
I created the UIScrollView that contains an UIImageView and I also added the method
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return imgv;
}
and the UIScrollViewDelegate in the interface, but it isn't working.
Here is the code for the UIScrollView:
imgv = [[UIImageView alloc]
initWithFrame:CGRectMake(0, 0, 1000, 500)];
imgv.image = [UIImage imageWithData:retrievedData];
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 800, 800)];
scrollView setContentSize:CGSizeMake(imgv.image.size.width, imgv.image.size.height)];
scrollView.maximumZoomScale = 4;
scrollView.minimumZoomScale = 1;
[scrollView setScrollEnabled:YES];
scrollView.clipsToBounds = YES;
scrollView.delegate = self;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(hideImageView)];
[scrollView addSubview:imgv];
[view addSubview:scrollView];
I would be thankful, if someone could figure out what the problem could be.
You need to return imgv in your delegate method viewForZoomingInScrollView::
- (UIView *) viewForZoomingInScrollView:(UIScrollView *) view {
return imgv;
}
You have to add the imageView as a subview to the scrollview
[scrollView addSubview:imgv];
I believe you are forgetting to set the frame of your imageView properly
self.imageView.frame=CGRectMake(0, 0, self.imageView.image.size.width, self.imageView.image.size.height);
Related
I have implemented a gallery application by using iCarousel.Now I need to include pinch gestures to zoom in or zoom out each image.I added scroll view and tried the delegate methods.But no success.
please help me with this.
- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)indexs reusingView:(UIView *)view
{
imgview = [[UIImageView alloc] init];
UIImage * img = [items objectAtIndex:indexs];
view = [[UIImageView alloc] initWithFrame:CGRectMake(0, 50, 320.0f,568)];
((UIImageView *)view).image = [UIImage imageNamed:#"page.png"];
imgView.image= img ;
imgView.contentMode = UIViewContentModeScaleAspectFit;
self.scrollView = [[UIScrollView alloc] init];
self.scrollView.backgroundColor = [UIColor redColor];
self.scrollView .frame = CGRectMake(18,10, 282, 568);
self.scrollView.delegate =self;
self.scrollView.contentSize = CGSizeMake(imgView.frame.size.width, imgView.frame.size.height);
self.scrollView.maximumZoomScale = MAXIMUM_SCALE;
self.scrollView.minimumZoomScale = MINIMUM_SCALE;
self.scrollView.clipsToBounds = NO;
[view addSubview:self.scrollView];
imgView.contentMode = UIViewContentModeScaleAspectFit;
[self.scrollView addSubview:imgView];
view.backgroundColor=[UIColor whiteColor];
view.layer.borderColor=[[UIColor lightGrayColor] CGColor];
view.layer.borderWidth=1;
view.layer.cornerRadius = 5;
view.layer.masksToBounds = YES;
return view;
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return imgView;
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
{
}
I have tried something like this.
And I tried adding pinch gestures to imgView also.
I have a few buttons that each load a different image a UIScrollView, you can zoom in on these images. What happens is that after selecting a new images the previous one is still there in the scrollview. How do I clean up the scroll view before opening a new image in there?
This is the code so far:
- (UIView *) viewForZoomingInScrollView: (UIScrollView *)scrollView{
return imgView;
}
-(IBAction)buttonClicked: (UIButton *)sender{
switch (sender.tag) {
case 1:{
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];
self.imgView = myImageView;
[myImageView release];
scrollView.contentSize = CGSizeMake(imgView.frame.size.width, imgView.frame.size.height);
scrollView.maximumZoomScale = 4.0;
scrollView.minimumZoomScale = 1.0;
scrollView.clipsToBounds = YES;
scrollView.delegate = self;
[scrollView addSubview:imgView];
}
}
}
You keep adding new subviews without removing the previous ones. You could just replace the image content in the existing imageView instead of making a new one.
Replace this:
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];
self.imgView = myImageView;
[myImageView release];
with
self.imageView.image = [UIImage imageNamed:#"Gath.jpg"];
and remove this
[scrollView addSubview:imgView];
I assume you have linked the imageView to self.imageView elsewhere, such as in the storyboard, or when you create the scrollView.
you can try this,
[myImageView removeFromSuperView];
myImageView=nil;
myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];
I'm trying to add a view behind my grouped UITableView. Unfortunately, whenever I scroll, the background view moves as well. This happens even when I use [self.view insertSubview:backgroundView belowSubview:_tableView], or [_tableView setBackgroundView:backgroundView]. Why is this background view scrolling? Also, why does my tableView scroll, even though I have disabled scrolling? Are these related?
In app Delegate:
History *historyController = [[History alloc] init];
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:historyController];
In History.m:
- (void)viewDidLoad {
CGRect frame = self.view.frame;
frame.origin.x = 0;
frame.origin.y = 0;
_tableView = [[UITableView alloc] initWithFrame:frame style:UITableViewStyleGrouped];
_tableView.delegate = self;
_tableView.dataSource = self;
[_tableView setScrollEnabled:NO];
[_tableView setBackgroundColor:[UIColor clearColor]];
_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
UIView *bg = [[UIView alloc] initWithFrame:frame];
[bg setBackgroundColor:[UIColor scrollViewTexturedBackgroundColor]];
UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"CenterFade.png"]];
iv.alpha = .750;
[bg addSubview:iv];
[iv release]; iv = nil;
[self.view addSubview:bg];
[self.view addSubview:_tableView];
[bg release]; bg = nil;
[_tableView release];
[super viewDidLoad];
}
Try
- (void)viewDidLoad {
CGRect frame = self.view.frame;
frame.origin.x = 0;
frame.origin.y = 0;
UIView *bg = [[UIView alloc] initWithFrame:frame];
[bg setBackgroundColor:[UIColor scrollViewTexturedBackgroundColor]];
UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"CenterFade.png"]];
iv.alpha = .750;
[bg addSubview:iv];
[iv release];
iv = nil;
_tableView = [[UITableView alloc] initWithFrame:frame style:UITableViewStyleGrouped];
_tableView.delegate = self;
_tableView.dataSource = self;
[_tableView setScrollEnabled:NO];
[_tableView setBackgroundColor:[UIColor clearColor]];
_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
[bg addSubview:_tableView];
[_tableView release];
_tableView = nil;
[self.view addSubview:bg];
[bg release];
bg = nil;
[super viewDidLoad];
}
If your controller is an UITableViewController just change it to an UIViewController<UITableViewDelegate, UITableViewDatasource> with a tableView property (It's the same)
I don't know why this is happening, but for some reason self.view is a UITableView and not a UIView. Creating a new UIView and setting it to self.view fixed the problem. I am not using a UITableViewController, but a UIViewController. No idea where the UITableView is coming from!
set [_tableView setBackgroundColor:[UIColor clearColor]];
and then put your background view under UITableView in UIViewController view hierarchy.
UITableView has a backgroundView property.
Swift:
var backgroundView: UIView?
Objective-C
#property(nonatomic, readwrite, retain) UIView *backgroundView
This view will not be moved when you scroll the tableView
Help me.
addSubview doesn't work.
I want to add "ContentView" on scrollView.
But "ContentView" doesn't appear on screen.
"ContentView" is UIView.
When I change to self.view=scrollView from [self.view addSubview:scrollView],
addSubview doesn't work.
Please teach me how to add UIView on this screen!!
- (void)viewDidLoad {
[super viewDidLoad];
scrollViewMode = ScrollViewModeNotInitialized;
mode = 1;
imageViewArray = [[NSMutableArray alloc] init];
mainStatic = [[MainStatics alloc] init];
[mainStatic setSetting];
NSString* path = [[NSBundle mainBundle] pathForResource:#"Files" ofType:#"plist"];
NSArray* dataFiles = [NSArray arrayWithContentsOfFile:path];
kNumImages = [dataFiles count];
CGRect frame = [UIScreen mainScreen].applicationFrame;
scrollView = [[touchClass alloc] initWithFrame:frame];
scrollView.delegate = self;
scrollView.maximumZoomScale = 5.0f;
scrollView.minimumZoomScale = 1.0f;
[scrollView setBackgroundColor:[UIColor blackColor]];
[scrollView setDelegate:self];
scrollView.delaysContentTouches=NO;
scrollView.userInteractionEnabled = YES;
[scrollView setCanCancelContentTouches:NO];
NSUInteger i;
for (i=0;i<[dataFiles count];i++)
{
UIImage* image = [UIImage imageNamed:[dataFiles objectAtIndex:i]];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.userInteractionEnabled = NO;
CGRect rect = imageView.frame;
rect.size.height = 480;
rect.size.width = 320;
imageView.frame = rect;
imageView.tag = i+1;
[imageViewArray addObject:imageView];
}
self.view = scrollView;
[self setPagingMode];
UIView* contentView;
CGRect scRect = CGRectMake(0, 436, 320, 44);
contentView = [[UIView alloc] initWithFrame:scRect];
[contentView addSubview:toolView];
[self addSubview:contentView];
}
I used image array in following function.
toolView is UIView with UIToolbar.
So I want to add toolbar to screen.
Yes, touchClass is subclass of UIScrollView.
1.I see.I forgot release this.Thank you.
2.OK. I modified this.But "ContentView" didn't apear.
are there another reason?
- (void)setPagingMode {
CGSize pageSize = [self pageSize];
NSUInteger page = 0;
for (UIView *view in imageViewArray){
[scrollView addSubview:view];
view.frame = CGRectMake(pageSize.width * page++, 0, pageSize.width, pageSize.height);
}
scrollView.pagingEnabled = YES;
scrollView.showsVerticalScrollIndicator = scrollView.showsHorizontalScrollIndicator = YES;
scrollView.contentSize = CGSizeMake(pageSize.width * [imageViewArray count], pageSize.height);
scrollView.contentOffset = CGPointMake(pageSize.width * currentPage, 0);
scrollViewMode = ScrollViewModePaging;
}
Source isn't clear.
You never use array with UIImageView. There is no info what is toolView etc...
Please provide more detailed source. Is touchClass a subclass of UIScrollView?
What I noticed in your code:
You don't release image and imageView. All this images imageViews will be leaked. At the end of loop you should add [imageView release]; and [image release];
I don't think that it is good idea to send [self addSubview:contentView]; Try to use [self.view addSubview:contentView];
I am trying to add the UIButton to UIScrollView.
I have added the UIImageView with background image *(size: 320 * 620)*.
Then I added this UIImageView to UIScrollView, and It works fine.
But now I want to add UIButton at position at : (60, 500); (below screen that would appear after scrolling).
I have tried following code, but the button is added on UIView not on scrollview. Button is not getting displayed on the top.
Code :
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationController.navigationBar.hidden = TRUE;
UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"SingleModelVar.png"]];
self.imageView = tempImageView;
[tempImageView release];
imageView.userInteractionEnabled = YES;
scrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; //fit to screen
//scrollView.delaysContentTouches = NO;
scrollView.contentSize = CGSizeMake(320, imageView.frame.size.height); //imageView.frame.size.height=620 here
scrollView.maximumZoomScale = 4.0;
scrollView.minimumZoomScale = 0.75;
scrollView.clipsToBounds = YES;
scrollView.delegate = self;
//The Problem begins ..........
btnStartDate=[[UIButton alloc] initWithFrame:CGRectMake(60,500,100,20)];
[scrollView addSubview:btnStartDate];
//[self.view addSubview:btnStartDate];
btnEndDate=[[UIButton alloc] initWithFrame:CGRectMake(60,530,100,20)];
[scrollView addSubview:btnEndDate];
//[self.view addSubview:btnEndDate];
[scrollView addSubview:imageView];
[[self view] addSubview:scrollView];
}
it is not displayed at the top because you added them before you added the imageView.
Put [scrollView addSubview:imageView]; before btnStartDate=[[UIButton alloc] initWithFrame:CGRectMake(60,500,100,20)];