the uimageview not refresh me from a url - ios

Question

I need help, I have an application that collects my profile picture facebook, the problem is that if I change this profile picture on facebook and then go to my application, I still shows the old image, but the service returns me good url with the updated image, which can be happening?
if ([session sessionType] == MASTFacebook) {
NSLog (# "fbPictureURL:% #", [(MAFacebookSession *) session fbPictureURL]);
[self.userImgView setImageWithURL [(MAFacebookSession *) session fbPictureURL]];
}

Answer 1

Because you are caching image, try to use NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:-1]; and use method like setImageWithURLRequest to set your UIImageView.
In your case, the code should be like followings if you are using UIImageView+AFNetworking
if ([session sessionType] == MASTFacebook) {
NSLog (# "fbPictureURL:% #", [(MAFacebookSession *) session fbPictureURL]);
NSURL *url = [(MAFacebookSession *) session fbPictureURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:-1];
// if you are using UIImageView+AFNetworking. the method is as follows
[self.userImgView setImageWithURLRequest:request placeholderImage:nil success:nil failure:nil]];
}

Answer 2

Because you are using setImageWithURL so it will cache your image automatically by url , so you should also update image url after update image.

Answer 3

best way will be once you get the image url from Facebook convert it into UIImage and save it. depending on your requirement(app delegate , UserDefaults). Then assign it to ImageView. So that you can use image in any view controller as the your profile pic is already convert into Image it will not take time to convert(not caching but works as cache). when ever you login you can get the updated profile pic.
ex:
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"your image url" forKey:#"profileImage"];
Here you can saving Data (In UserDefaults we can not save image so we save data).
UIImageView *view =[[UIImageView alloc]initWithData:[defaults objectForKey:#"profileImage"]];