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"];
    
}