ios中asihttprequest 下载缓存

asi中下载缓存第一种方法

#import <UIKit/UIKit.h>
#import "ASIHTTPRequest.h"
#import "ASIDownloadCache.h"
@interface ViewController : UIViewController<ASIHTTPRequestDelegate>
- (IBAction)click:(id)sender;
@property (retain, nonatomic) IBOutlet UIImageView *img1;

@end

#import "ViewController.h"

@interface ViewController ()
{

}
@property(nonatomic,retain)NSDate *startData;
@property(nonatomic,retain)NSDate *endData;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)click:(id)sender {

    [self download];

}

-(void)download{
    self.startData=[NSDate date];
           NSLog(@"start-->%@",self.startData);
    __block ASIHTTPRequest *request=nil;
  NSString *url=@"http://d.hiphotos.baidu.com/album/w%3D2048/sign=349954701b4c510faec4e51a5461272d/d1a20cf431adcbefc5d4f4beadaf2edda2cc9fa2.jpg";
  request=[ASIHTTPRequest requestWithURL:[NSURL URLWithString:url]];
    request.delegate=self;
    //设置缓存时间
    request.secondsToCache=***;//一周

    NSString *cachePath=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    cachePath =[cachePath stringByAppendingPathComponent:@"res"];
    //缓存类
   ASIDownloadCache *_cache=[ASIDownloadCache sharedCache];

    [request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
    [request setDownloadCache:_cache];
    [request setCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];
    [request startAsynchronous];

}

-(void)success:(ASIHTTPRequest *)request{
    if ([request didUseCachedResponse]) {
        NSLog(@"来自于缓存");
    }
    else{
        NSLog(@"NO");
    }
}

-(void)requestFinished:(ASIHTTPRequest *)request{
    if ([request didUseCachedResponse]) {
        self.endData=[NSDate date];
        NSLog(@"来缓存-->%@",self.endData);
        self.img1.image=[UIImage imageWithData:[request responseData]];
    }
    else{
        self.endData=[NSDate date];

        NSLog(@"   NO-->%@",self.endData);
            self.img1.image=[UIImage imageWithData:[request responseData]];
    }
}

-(void)requestFailed:(ASIHTTPRequest *)request{

}

- (void)dealloc {
    [_img1 release];
    [self.startData release];
    [self.endData release];
    [super dealloc];
}
@end

第二设置缓存

-(void)download{
    __block ASIHTTPRequest *request=nil;

    NSString *url=@"http://f.hiphotos.baidu.com/album/w%3D2048/sign=288b34a9e4dde711e7d244f693d7cc1b/18d8bc3eb13533fa7f621782a9d3fd1f40345b42.jpg";
  request=[ASIHTTPRequest requestWithURL:[NSURL URLWithString:url]];
    request.delegate=self;
    //设置缓存时间
    request.secondsToCache=***;//一周

    //设置完成时回调方法
    [request setDidFinishSelector:@selector(success:)];

    NSString *cachePath=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    cachePath =[cachePath stringByAppendingPathComponent:@"res"];
    //缓存类
    ASIDownloadCache *_cache=[ASIDownloadCache sharedCache];
    //设置缓存目录
    [_cache setStoragePath:cachePath];
    //设置缓存策略
    [_cache setDefaultCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];

    //request永久存储
    [request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
    [request setDownloadCache:_cache];

    [request startAsynchronous];
}

-(void)success:(ASIHTTPRequest *)request{
    if ([request didUseCachedResponse]) {
        NSLog(@"来自于缓存");
    }
    else{
        NSLog(@"NO");
    }
}

-(void)requestFailed:(ASIHTTPRequest *)request{

}