#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"]; }