iOS SDWebImage（二）
//1.下载图片且需要获取下载进度
//内存缓存&磁盘缓存
-(void)download
{
[self.imageView sd_setImageWithURL:[NSURL URLWithString:@"http://img4.duitang.com/uploads/blog/201310/18/20131018213446_smUw4.thumb.600_0.jpeg"] placeholderImage:[UIImage imageNamed:@"Snip20160221_306"] options:SDWebImageCacheMemoryOnly | SDWebImageProgressiveDownload progress:^(NSInteger receivedSize, NSInteger expectedSize) {
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
switch (cacheType) {
case SDImageCacheTypeNone:
NSLog(@"直接下载");
break;
case SDImageCacheTypeDisk:
NSLog(@"磁盘缓存");
break;
case SDImageCacheTypeMemory:
NSLog(@"内存缓存");
break;
default:
break;
}];NSLog(@"%@",[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]);}
//2.只需要简单获得一张图片,不设置
//内存缓存&磁盘缓存
-(void)download2
{
[[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:@"http://img4.duitang.com/uploads/blog/201310/18/20131018213446_smUw4.thumb.600_0.jpeg"] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {
NSLog(@"%f",1.0 * receivedSize / expectedSize);
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
//得到图片
self.imageView.image = image;
}];
}
//3.不需要任何的缓存处理
//没有做任何缓存处理|
-(void)download3
{
//data:图片的二进制数据
[[SDWebImageDownloader sharedDownloader] downloadImageWithURL:[NSURL URLWithString:@"http://img4.duitang.com/uploads/blog/201310/18/20131018213446_smUw4.thumb.600_0.jpeg"] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {
} completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
[[NSOperationQueue mainQueue]addOperationWithBlock:^{
self.imageView.image = image;
}];
}];
}
//4.播放Gif图片
-(void)gif
{
NSLog(@"%s",__func__);
//self.imageView.image = [UIImage imageNamed:@"39e805d5ad6eddc4f80259d23bdbb6fd536633ca"];
UIImage *image = [UIImage sd_animatedGIFNamed:@"39e805d5ad6eddc4f80259d23bdbb6fd536633ca"];
self.imageView.image = image;
}
-(void)type
{
NSData *imageData = [NSData dataWithContentsOfFile:@"/Users/xiaomage/Desktop/Snip20160221_306.png"];
NSString *typeStr = [NSData sd_contentTypeForImageData:imageData];
NSLog(@"%@",typeStr);
}
1.清除缓存
clear:直接删除缓存目录下面的文件,然后重新创建空的缓存文件
clean:清除过期缓存,计算当前缓存的大小,和设置的最大缓存数量比较,如果超出那么会继续删除(按照文件了创建的先后顺序)
过期时间:7天
[[SDWebImageManager sharedManager].imageCache clearMemory];
2.取消当前所有的操作
[[SDWebImageManager sharedManager] cancelAll];
3.最大并发数量==6
4.缓存文件的保存名称如何处理?拿到图片的URL路径,对该路径进行MD5加密
5.该框架内部对内存警告的处理方式?内部通过监听通知的方式请你缓存
6.该框架进行缓存处理的方式:可变字典--->NSCache
7.如何判断图片的类型:在判断图片类型的时候，只匹配第一个字节
8.队列中任务的处理方式:FIFO
9.如何下载图片的?发送网络请求下载图片,NSURLConnection
10.请求超时的时间15秒
