ios中ASIHTTPRequst的封装

#import <Foundation/Foundation.h>
#import "ASIHTTPRequest.h"
#import "ASIDownloadCache.h"
typedef void (^MyBlock)(UIImage *image);

@interface AsyncDownLoading : NSObject
+(id)ShareAsyncDownload;
-(void)LoadImageWithUrl:(NSString *)url;
@property(nonatomic,copy)MyBlock imageBlock;
@end

#import "AsyncDownLoading.h"

@implementation AsyncDownLoading

+(id)ShareAsyncDownload{

static dispatch_once_t onceToken;

static AsyncDownLoading *downLoad=nil;

dispatch_once(&onceToken, ^{

downLoad=[[AsyncDownLoadingalloc] init];

});

return downLoad;

}

//暂时没有用

-(NSString *)cacheFileForImage:(NSString *)imageUrl{

NSString *cacheFolder=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

cacheFolder=[cacheFolder stringByAppendingPathComponent:@"imagecache"];

NSFileManager *fmgr=[NSFileManagerdefaultManager];

if (![fmgr fileExistsAtPath:cacheFolder]) {

[fmgr createDirectoryAtPath:cacheFolder withIntermediateDirectories:YESattributes:nilerror:nil];

}

NSArray *paths=[imageUrl componentsSeparatedByString:@"/"];

NSString *saveStr= [[paths lastObject] length]>0?[paths lastObject]:@"";

return [NSString stringWithFormat:@"%@/%@",cacheFolder,saveStr];

}

-(void)LoadImageWithUrl:(NSString *)url{

__block ASIHTTPRequest *Request=nil;

if(url){

Request=[ASIHTTPRequestrequestWithURL:[NSURLURLWithString:url]];

[Request setDelegate: self];

//设置下载缓存

[Request setDownloadCache:[ASIDownloadCachesharedCache]];

// 设置缓存策略

[Request setCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];

//设置指定存储方式

[Request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];

//在后台也运行

[Request setShouldContinueWhenAppEntersBackground:YES];

[Request setTimeOutSeconds:60];

[Request setCompletionBlock:^{

if([Request didUseCachedResponse]){

NSLog(@"缓存");

}

else{

NSLog(@"重新创建");

}

NSLog(@"--1--%@",[NSThreadcurrentThread]);

UIImage *image=[UIImageimageWithData:[Request responseData]];

self.imageBlock(image);

}];

[Request setFailedBlock:^{

NSLog(@"请求失败error-->%@",Request.error.localizedDescription);

}];

[Request startAsynchronous];

}

}

-(void)dealloc

{

Block_release(self.imageBlock);

[super dealloc];

}

@end

- (IBAction)clicki2:(id)sender {
    AsyncDownLoading *down=[AsyncDownLoading ShareAsyncDownload];
    down.imageBlock=^(UIImage *image){
        self.img1.image=image;
    };
    [down LoadImageWithUrl:@"http://h.hiphotos.baidu.com/album/w%3D2048/sign=45753fa7e850352ab1612208677bfaf2/2e2eb9389b504fc2aae48015e4dde71190ef6d62.jpg"];

}