TTURLCache Three20 图片缓存-优快云博客

本文介绍了使用three20框架中的TTURLCache组件进行图片缓存的方法。通过实例展示了如何从网络加载图片并将其存储到缓存中，以及如何从缓存中获取已存储的图片。文中还对比了两种不同的缓存实现方式。

three20图片缓存, image cache:

UIImageView *image  = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 200, 200)];
    [image setBackgroundColor:[UIColor redColor]];
   // [self.view addSubview:image];

    NSString *imgurl=@"http://img1.cache.netease.com/www/logo/logo-ipad-icon.png";
    TTURLCache *cache = [TTURLCache sharedCache];

    if (![cache hasDataForKey:imgurl expires:3000]) {
        NSLog(@"缓存图片");
        [[UIImage alloc]initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imgurl]]];
        [cache storeImage:[[UIImage alloc]initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imgurl]]] forURL:imgurl];

    }   
    //取缓存图片
    if ([cache hasImageForURL:imgurl fromDisk:YES]) {
        NSLog(@"取缓存图片");
        [image setImage:[cache imageForURL:imgurl]];  
    }
    [self.view addSubview:image];

Date Cache:


UIImageView *image  = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 200, 200)];
    [image setBackgroundColor:[UIColor redColor]];
    // [self.view addSubview:image];

    NSString *imgurl=@"http://img1.cache.netease.com/www/logo/logo-ipad-icon.png";
    TTURLCache *cache = [TTURLCache sharedCache];
    NSLog(@"begin");
    if (![cache hasDataForURL:imgurl]) {
        NSLog(@"缓存图片");
        [cache storeData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imgurl]] forURL:imgurl];
    }
    //取缓存图片
    if ([cache hasDataForURL:imgurl]) {
        NSLog(@"取缓存图片");
        [image setImage:[UIImage imageWithData:[cache dataForURL:imgurl]]];
    }
    [self.view addSubview:image];
    NSLog(@"end");