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ImageLoader.m
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ImageLoader.m
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//
// My eBay App - ImageLoader.m
// Copyright 2010 eBay Inc. All rights reserved.
//
// Created by: Jon Reid
//
#import "ImageLoader.h"
@interface ImageLoader ()
@property (nonatomic, retain) NSMutableData *imageData;
@property (nonatomic, retain) NSURLConnection *imageDownload;
@end
@implementation ImageLoader
@synthesize imageURL;
@synthesize keepImageWhileURLIsLoading;
@synthesize imageData;
@synthesize imageDownload;
- (id)initWithImageView:(UIImageView *)anImageView
{
self = [super init];
if (self != nil)
{
imageView = [anImageView retain];
}
return self;
}
- (void) dealloc
{
[imageDownload cancel];
[imageView release];
[imageURL release];
[imageData release];
[imageDownload release];
[super dealloc];
}
- (void)setImageURL:(NSString *)URLString
{
if ([URLString isEqualToString:imageURL])
{
return;
}
if (!keepImageWhileURLIsLoading)
{
[imageView setImage:nil];
}
if (URLString != nil)
{
NSURL *URL = [[NSURL alloc] initWithString:URLString];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:URL];
// Initiate connection that starts without waiting for user interface to stop moving.
NSURLConnection *download = [[NSURLConnection alloc] initWithRequest:request
delegate:self
startImmediately:NO];
[self setImageDownload:download];
[download scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
[download start];
[download release];
[request release];
[URL release];
}
[imageURL release];
imageURL = [URLString retain];
}
/// Releases temporary data used for downloading image
- (void)clearDownloadData
{
[self setImageData:nil];
[self setImageDownload:nil];
}
- (void)cancelDownload
{
if (imageDownload != nil)
{
[imageDownload cancel];
[self clearDownloadData];
[self setImageURL:nil];
}
}
#pragma mark -
#pragma mark NSURLConnectionDelegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
if (connection != imageDownload)
{
return;
}
[imageData release];
long long expectedContentLength = [response expectedContentLength];
if (expectedContentLength != NSURLResponseUnknownLength)
{
imageData = [[NSMutableData alloc] initWithCapacity:expectedContentLength];
}
else
{
imageData = [[NSMutableData alloc] init];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
if (connection != imageDownload)
{
return;
}
[imageData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if (connection != imageDownload)
{
return;
}
UIImage *image = [[UIImage alloc] initWithData:imageData];
[imageView setImage:image];
[image release];
[self clearDownloadData];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
if (connection != imageDownload)
{
return;
}
[self clearDownloadData];
}
@end