SDWebImageDownloader.m
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/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import "SDWebImageDownloader.h"
@interface SDWebImageDownloader ()
@property (nonatomic, retain) NSURLConnection *connection;
@property (nonatomic, retain) NSMutableData *imageData;
@end
@implementation SDWebImageDownloader
@synthesize url, delegate, connection, imageData;
#pragma mark Public Methods
+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate
{
SDWebImageDownloader *downloader = [[[SDWebImageDownloader alloc] init] autorelease];
downloader.url = url;
downloader.delegate = delegate;
[downloader start];
return downloader;
}
+ (void)setMaxConcurrentDownloads:(NSUInteger)max
{
// NOOP
}
- (void)start
{
// In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
self.connection = [[[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO] autorelease];
// Ensure we aren't blocked by UI manipulations (default runloop mode for NSURLConnection is NSEventTrackingRunLoopMode)
[connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
[connection start];
[request release];
if (connection)
{
self.imageData = [NSMutableData data];
}
else
{
if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
{
[delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:nil];
}
}
}
- (void)cancel
{
if (connection)
{
[connection cancel];
self.connection = nil;
}
}
#pragma mark NSURLConnection (delegate)
- (void)connection:(NSURLConnection *)aConnection didReceiveData:(NSData *)data
{
[imageData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)aConnection
{
UIImage *image = [[UIImage alloc] initWithData:imageData];
self.imageData = nil;
self.connection = nil;
if ([delegate respondsToSelector:@selector(imageDownloader:didFinishWithImage:)])
{
[delegate performSelector:@selector(imageDownloader:didFinishWithImage:) withObject:self withObject:image];
}
[image release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
{
[delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:error];
}
self.connection = nil;
self.imageData = nil;
}
#pragma mark NSObject
- (void)dealloc
{
[url release], url = nil;
[connection release], connection = nil;
[imageData release], imageData = nil;
[super dealloc];
}
@end