"No visible #interface declares the selector" error - ios

Question

I inserted an image view in my view controller but dont actually know how to display image on it.
I tried this:
- (void)viewDidLoad
{
[super viewDidLoad];
id path = #"http://thestylishdog.com/wp-content/uploads/2009/07/cute-dog2.jpg";
NSURL *url = [NSURL URLWithString:path];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImageView *firstImage = [[UIImage alloc] initWithData:data cache:NO];
}
But then it says that 'No visible #interface for UIimage declares the selector initwithData:cache'
I tried adding this line to the .h file but does not work either:
#property (nonatomic, retain) UIImageView *firstImage;
I know that the last step would be to assign that .h create class to the UIimage in the viewcontroller.

Answer 1

You can use try this code to add image from the path in your imageview
NSURL *url = [NSURL URLWithString:#"http://thestylishdog.com/wp-content/uploads/2009/07/cute-dog2.jpg"];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *image = [UIImage imageWithData:data];
imageView = [[UIImageView alloc] initWithImage:image];
Don't forget to show your imageView as outlet to xib if you are adding through GUI otherwise add it to your view as subview

Answer 2

Try [[UIImage alloc] initWithData:data]; you can cache using an NSCachedURLResponse for the response.

Answer 3

You can use this to load images from URLs:
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://..."]]];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
But this will block your app until your image loads. It's best to load your images asynchronously when using images from the web. If the images are downloaded in a different thread user can keep interacting with the app. You can check this example from apple about lazy loading images: LazyTableImages
Or you can checkout this tutorial for async image download:
UItables with downloaded images