使用
1. sd_setImageWithURL：
//图片缓存的基本代码，就是这么简单
[self.image1 sd_setImageWithURL:imagePath1];
2. sd_setImageWithURL: completed:
//用block 可以在图片加载完成之后做些事情
[self.image2 sd_setImageWithURL:imagePath2 completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
NSLog(@"这里可以在图片加载完成之后做些事情");
}];
3. sd_setImageWithURL: placeholderImage:
//给一张默认图片，先使用默认图片，当图片加载完成后再替换
[self.image1 sd_setImageWithURL:imagePath1 placeholderImage:[UIImage imageNamed:@"default"]];
4. sd_setImageWithURL: placeholderImage: completed:
//使用默认图片，而且用block 在完成后做一些事情
[self.image1 sd_setImageWithURL:imagePath1 placeholderImage:[UIImage imageNamed:@"default"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
NSLog(@"图片加载完成后做的事情");
}];
5. sd_setImageWithURL: placeholderImage: options:
//options 选择方式
[self.image1 sd_setImageWithURL:imagePath1 placeholderImage:[UIImage imageNamed:@"default"] options:SDWebImageRetryFailed];
一、options所有选项：
//失败后重试
SDWebImageRetryFailed = 1 << 0,
//UI交互期间开始下载，导致延迟下载比如UIScrollView减速。
SDWebImageLowPriority = 1 << 1,
//只进行内存缓存
SDWebImageCacheMemoryOnly = 1 << 2,
//这个标志可以渐进式下载,显示的图像是逐步在下载
SDWebImageProgressiveDownload = 1 << 3,
//刷新缓存
SDWebImageRefreshCached = 1 << 4,
//后台下载
SDWebImageContinueInBackground = 1 << 5,
//NSMutableURLRequest.HTTPShouldHandleCookies = YES;
SDWebImageHandleCookies = 1 << 6,
//允许使用无效的SSL证书
//SDWebImageAllowInvalidSSLCertificates = 1 << 7,
//优先下载
SDWebImageHighPriority = 1 << 8,
//延迟占位符
SDWebImageDelayPlaceholder = 1 << 9,
//改变动画形象
SDWebImageTransformAnimatedImage = 1 << 10,
二、SDImageCacheType所有选项：
SDImageCacheType 当下载请求结束时,通过这个枚举来告知图片的来源
if (cacheType == SDImageCacheTypeNone) {
NSLog(@"网络");
}else if (cacheType == SDImageCacheTypeDisk) {
NSLog(@"设备硬盘");
}else if (cacheType == SDImageCacheTypeMemory) {
NSLog(@"内存");
}
