Xcode iPhone Programming: Loading a jpg into a UIImageView from URL

Question

My app has to load an image from a http server and displaying it into an UIImageView
How can i do that??
I tried this:

NSString *temp = [NSString alloc]; [temp stringwithString:@"http://192.168.1.2x0/pic/LC.jpg"] temp=[(NSString *)CFURLCreateStringByAddingPercentEscapes(     nil,     (CFStringRef)temp,                          NULL,     NULL,     kCFStringEncodingUTF8) autorelease];   NSData *dato = [NSData alloc];  dato=[NSData dataWithContentsOfURL:[NSURL URLWithString:temp]];  pic = [pic initWithImage:[UIImage imageWithData:dato]]; 

This code is in viewdidload of the view but nothing is displayed! The server is working because i can load xml files from it. but i can't display that image!
I need to load the image programmatically because it has to change depending on the parameter passed! Thank you in advance. Antonio

Answer 1

It should be:

NSURL * imageURL = [NSURL URLWithString:@"http://192.168.1.2x0/pic/LC.jpg"]; NSData * imageData = [NSData dataWithContentsOfURL:imageURL]; UIImage * image = [UIImage imageWithData:imageData]; 

Once you have the image variable, you can throw it into a UIImageView via it's image property, ie:

myImageView.image = image; //OR [myImageView setImage:image]; 

If you need to escape special characters in your original string, you can do:

NSString * urlString = [@"http://192.168.1.2x0/pic/LC.jpg" stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; NSURL * imageURL = [NSURL URLWithString:urlString]; .... 

If you're creating your UIImageView programmatically, you do:

UIImageView * myImageView = [[UIImageView alloc] initWithImage:image]; [someOtherView addSubview:myImageView]; [myImageView release]; 

Answer 2

And because loading image from URL takes ages, it would be better to load it asynchronously. The following guide made it stupid-simple for me:

http://www.switchonthecode.com/tutorials/loading-images-asynchronously-on-iphone-using-nsinvocationoperation