Comments on: Download, Create and Display an Image from URL http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html iOS Developer Tips, Tricks and Tutorials. Wed, 08 Feb 2012 06:31:16 -0600 hourly 1 http://wordpress.org/?v=3.3.1 By: HockeyBias.com http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html#comment-60626 HockeyBias.com Tue, 27 Sep 2011 19:01:39 +0000 http://iPhoneDeveloperTips.com/?p=4476#comment-60626 Thanks! Thanks!

]]> By: book http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html#comment-7061 book Wed, 25 Nov 2009 07:08:01 +0000 http://iPhoneDeveloperTips.com/?p=4476#comment-7061 thanks thanks

]]> By: John Muchow http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html#comment-6257 John Muchow Wed, 04 Nov 2009 13:34:53 +0000 http://iPhoneDeveloperTips.com/?p=4476#comment-6257 Paul / Adrian, Good call on the background thread...in cases such as this, I typically request the synchronous code to run in a new thread, something similar to the following: <pre lang="objc"> - (void) loadImageInBackground { NSURL *url = [NSURL URLWithString: @"http://iphonedevelopertips.com/images/logo-iphone-dev-tips.png"]; // Assume image is an instance variable image = [[UIImage imageWithData: [NSData dataWithContentsOfURL:url]] retain]; } ... [NSThread detachNewThreadSelector:@selector(loadImageInBackground) toTarget:self withObject:nil]; ... [self.view addSubview:[[UIImageView alloc] initWithImage:image]]; </pre> Paul / Adrian,

Good call on the background thread…in cases such as this, I typically request the synchronous code to run in a new thread, something similar to the following:

- (void) loadImageInBackground
{
  NSURL *url = [NSURL URLWithString: 
     @"http://iphonedevelopertips.com/images/logo-iphone-dev-tips.png"];
 
  // Assume image is an instance variable
  image = [[UIImage imageWithData: [NSData dataWithContentsOfURL:url]] retain];
}
 
...
 
[NSThread detachNewThreadSelector:@selector(loadImageInBackground)
   toTarget:self withObject:nil];
 
...
 
[self.view addSubview:[[UIImageView alloc] initWithImage:image]];
]]> By: Adrian http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html#comment-6255 Adrian Wed, 04 Nov 2009 12:06:33 +0000 http://iPhoneDeveloperTips.com/?p=4476#comment-6255 The problem with this approach is that this will block the UI thread until the image is downloaded. I would suggest using EGOImageLoading by Enormego for example http://url.akosma.com/sz9xb which loads the image in a background thread, and even caches it so that later it's retrieved from the local disk. The problem with this approach is that this will block the UI thread until the image is downloaded. I would suggest using EGOImageLoading by Enormego for example http://url.akosma.com/sz9xb which loads the image in a background thread, and even caches it so that later it’s retrieved from the local disk.

]]> By: Paul Westbrook http://iPhoneDeveloperTips.com/cocoa/download-and-create-an-image-from-a-url.html#comment-6252 Paul Westbrook Wed, 04 Nov 2009 10:51:10 +0000 http://iPhoneDeveloperTips.com/?p=4476#comment-6252 The problem this code is that the fetch happens synchronously. If this is called in the UI thread, the app will appear block while the image is being fetched. The fetch should happen on a background thread. The problem this code is that the fetch happens synchronously. If this is called in the UI thread, the app will appear block while the image is being fetched.

The fetch should happen on a background thread.

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