How to create a UIImage from Facebook response data? - ios

Question

I use the following code to download the profile picture from a Facebook user’s friends array:
NSString *urlString = friendData[#"picture"][#"data"][#"url"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:2.0f];
[NSURLConnection sendAsynchronousRequest:urlRequest
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *resp, NSData *data, NSError *error) {
UIImage *image = [UIImage imageWithData:data];
}];
urlString is valid, i.e. I can open it in Safari, and I do see the picture there.
In the completion handler, error is nil, and data has 1583 bytes.
However, image is initialized as nil, i.e. image could not be initialized from the specified data.
What is wrong with my code?
EDIT (due to the comment of rckoenes):
resp contains the following data:
{ status code: 200, headers {
"Access-Control-Allow-Origin" = "*";
"Cache-Control" = "max-age=1209600, no-transform";
"Content-Length" = 1583;
"Content-Type" = "image/jpeg";
Date = "Thu, 01 Oct 2015 09:19:41 GMT";
Expires = "Thu, 15 Oct 2015 08:08:18 GMT";
"Last-Modified" = "Thu, 01 Oct 2015 06:36:27 GMT";
"timing-allow-origin" = "*";
} }

Answer 1

Try this code
Download AsyncImageView Class Here
.M File
#import "AsyncImageView.h"
NSString *urlString = friendData[#"picture"][#"data"][#"url"];
AsyncImageView *DescimageRight = [[AsyncImageView alloc]initWithFrame:CGRectMake(4,4,146,146)];
DescimageRight.contentMode = UIViewContentModeScaleAspectFill;
DescimageRight.backgroundColor=[UIColor clearColor];
DescimageRight.tag=999;
DescimageRight.imageURL=[NSURL URLWithString:urlString];
[self.view addSubview:DescimageRight];

Answer 2

I found the problem:
The code is correct, and the image is also loaded correctly.
The problem was that I set a breakpoint to the last line of the code, i.e. to
}]; // breakpoint was set here
Apparently, when the debugger stops there, it left already the scope of the completion handler, and image was already nil.
After I inserted a dummy statement behind the assignment to image, and set the breakpoint to this dummy statement, everything was OK.
Sorry for bothering you.