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NSURLConnection download with progress callbacks
This is the place that will get the progress call back and the image.
It must conform to the MyImageDownloaderDelegate protocol
- (void)somFunction
{
MyImageDownloader *downloader = [[MyImageDownloader alloc] init];
[downloader downloadImageFromURL:someUrl withDelegate:self];
}
- (void)downloadFailed
{
NSLog(@"Something went wrong");
}
- (void)progressUpdated:(CGFloat)progress
{
self.progressBar.progress = progress;
}
- (void)imageDownloadFinished:(UIImage *)image
{
self.imageView.image = image;
}
@protocol MyImageDownloaderDelegate <NSObject>
- (void)downloadFailed;
- (void)imageDownloadFinished:(UIImage *)image;
- (void)progressUpdated:(CGFloat)progress;
@end
@interface MyImageDownloader : NSObject
- (void)downloadImageFromURL:(NSURL *)url withDelegate:(id <MyImageDownloaderDelegate>)delegate;
@end
#import "MyImageDownloader.h"
@interface MyImageDownloader () <NSURLConnectionDataDelegate, NSURLConnectionDownloadDelegate>
@property (nonatomic, strong) NSURLConnection *connection;
@property (nonatomic, strong) NSMutableData *receivedData;
@property (nonatomic, weak) id <MyImageDownloaderDelegate> delegate;
@end
- (void)downloadImageFromURL:(NSURL *)url withProgressDelegate:(id <NSURLConnectionDownloadDelegate>)progressDelegate completionDelegate:(id <MyImageDownloaderDelegate>)delegate;
{
self.delegate = delegate;
NSURLRequest *request = [NSURLRequest requestWithURL:url];
self.receivedData = [NSMutableData data];
self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startsImmediately:NO];
self.connection.downloadDelegate = self;
[self.connection start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// check for errors
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
// check for errors
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// store the data that comes down
[self.receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// get the image and pass to delegate
UIImage *image = [UIImage imageWithData:self.receivedData];
[self.delegate imageDownloadFinished:image];
}
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