iphone Image doesn't appear after downloading - ios

Question

I am building a simple application to show images.
I send the image url, and it should be downloading.
This is my code:
#import "ImageViewController.h"
#interface ImageViewController ()
#property (nonatomic, strong) UIImageView * imageView;
#property (nonatomic, strong) UIImage * image;
#end
#implementation ImageViewController
-(void)setImageURL:(NSURL *)imageURL{
_imageURL = imageURL;
self.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:imageURL]];
}
-(UIImageView*)imageView{
if(!_imageView)
return [[UIImageView alloc]init];
return _imageView;
}
-(UIImage*)image{
return self.imageView.image;
}
-(void)setImage:(UIImage *)image{
self.imageView.image = image;
[self.imageView sizeToFit];
}
-(void)viewDidLoad{
[self.view addSubview:self.imageView];
NSLog(#"Image Url = %#", self.imageURL);
}
#end
I call it like this:
if ([segue.destinationViewController isKindOfClass:[ImageViewController class]]){
ImageViewController* ivc = (ImageViewController*)segue.destinationViewController;
ivc.imageURL = [[NSURL alloc]initWithString:[NSString stringWithFormat:#"http://images.apple.com/v/iphone-5s/gallery/a/images/download/%#.jpg", segue.identifier]];
I am 100% sure that the passed url is correct because I already check that through debugging
The image is absolutely being downloaded because its size is large and the screen is blocking while downloading it.
The problem is the that imageView doesn't show it after finishing downloading.
Could u help me please?
Edit
The header file
#import <UIKit/UIKit.h>
#interface ImageViewController : UIViewController
#property(nonatomic, strong) NSURL* imageURL;
#end
This is all my code, so you can test it if you want.
Edit2
I have a scroll view, maybe that is the problem ?
Please check the image

Answer 1

You have an issue in the getter of the imageView property. You are not initialising the attribute, but returning a different object each time. Replace the line:
return [[UIImageView alloc]init];
by
_imageView = [[UIImageView alloc]init];

Answer 2

Please try to edit your code as following it is working for me, in your case problem may be because you are passing url from different view controller that you are :
[self.imageView setImage:[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://images.apple.com/v/iphone-5s/gallery/a/images/download/photo_1.jpg"]]]];
You can check from attached screen shot..

Answer 3

Set the imageView's frame instead of sending sizeToFit method.
-(void)setImage:(UIImage *)image{
self.imageView.image = image;
// [self.imageView sizeToFit];
self.imageView.frame = CGRectMake(100.0, 100.0, image.size.width, image.size.height) ;
}
Edit :
I see there is a scrollView on 'self.view', so it may block self.imageView, try to bring it to front using [self.view bringSubviewToFront:self.imageView] ; if you want it be the topmost of all subView on self.view.

Answer 4

You are not assigning you newly created imageView to your _imageView. So every time it triggers imageView method, it returns a new UIImageView. try this...
- (UIImageView*)imageView
{
if(!_imageView) {
_imageView = [[UIImageView alloc]init];
return _imageView;
}
return _imageView;
}