本文給大家匯總了幾種IOS中實(shí)現(xiàn)異步加載圖片的方法，十分的簡(jiǎn)單實(shí)用，有需要的小伙伴可以參考下。

　　比較原始的方法：

　　代碼如下:

　　AsyncImageView.h:

　　#import

　　@interface AsyncImageView : UIView

　　{

　　NSURLConnection* connection;

　　NSMutableData* data;

　　}

　　- (void)loadImageFromURL:(NSURL*)url;

　　@end

　　AsyncImageView.m:

　　#import "AsyncImageView.h"

　　@implementation AsyncImageView

　　- (id)initWithFrame:(CGRect)frame

　　{

　　self = [super initWithFrame:frame];

　　if(self) {

　　// Initialization code

　　}

　　returnself;

　　}

　　- (void)loadImageFromURL:(NSURL*)url {

　　if(connection!=nil) { [connection release]; }

　　if(data!=nil) { [data release]; }

　　NSURLRequest* request = [NSURLRequest requestWithURL:url

　　cachePolicy:NSURLRequestUseProtocolCachePolicy

　　timeoutInterval:60.0];

　　connection = [[NSURLConnection alloc]

　　initWithRequest:request delegate:self];

　　}

　　- (void)connection:(NSURLConnection *)theConnection

　　didReceiveData:(NSData *)incrementalData {

　　if(data==nil) {

　　data =

　　[[NSMutableData alloc] initWithCapacity:2048];

　　}

　　[data appendData:incrementalData];

　　}

　　- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection {

　　[connection release];

　　connection=nil;

　　if([[self subviews] count] > 0) {

　　[[[self subviews] objectAtIndex:0] removeFromSuperview];

　　}

　　UIImageView *imageView = [[[UIImageView alloc] initWithImage:[UIImage imageWithData:data]] autorelease];

　　imageView.contentMode = UIViewContentModeScaleAspectFit;

　　imageView.autoresizingMask = ( UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight );

　　[self addSubview:imageView];

　　imageView.frame = self.bounds;

　　[imageView setNeedsLayout];

　　[self setNeedsLayout];

　　[data release];

　　data=nil;

　　}

　　- (UIImage*) image {

　　UIImageView* iv = [[self subviews] objectAtIndex:0];

　　return[iv image];

　　}

　　- (void)dealloc {

　　[connection cancel];

　　[connection release];

　　[data release];

　　[super dealloc];

　　}

　　@end

　　方法二：

　　復(fù)制代碼 代碼如下:

　　@interface UIButton (AsyncImage)

　　//size by point

　　- (void)setImageFromURL:(NSString *)urlString adjustToSize:(CGSize)size completion:(void (^)(void))completion logo:(UIImage *)logoImage;

　　@end

　　@implementation UIButton (AsyncImage)

　　- (void)setImageFromURL:(NSString *)urlString adjustToSize:(CGSize)size completion:(void (^)(void))completion logo:(UIImage *)logoImage

　　{

　　dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIOR