iOS清除APP图片缓存

废话不多说直接上代码，需要的自取
获取缓存大小：

-(void)getCacheSize{
//得到缓存路径
    NSString * path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
    NSFileManager * manager = [NSFileManager defaultManager];
    CGFloat size = 0;
//首先判断是否存在缓存文件
    if ([manager fileExistsAtPath:path]) {
        NSArray * childFile = [manager subpathsAtPath:path];
        for (NSString * fileName in childFile) {
            //缓存文件绝对路径
            NSString * absolutPath = [path stringByAppendingPathComponent:fileName];
            size = size + [manager attributesOfItemAtPath:absolutPath error:nil].fileSize;
        }
        //计算sdwebimage的缓存和系统缓存总和
        size = size + [[SDWebImageManager sharedManager].imageCache getSize];
    }
    size = [NSString stringWithFormat:@"%.2fM",size / 1024 / 1024];
}

删除缓存：

-(void)cleanCache{
//获取缓存路径
    NSString * path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
    NSFileManager * manager = [NSFileManager defaultManager];
//判断是否存在缓存文件
    if ([manager fileExistsAtPath:path]) {
        NSArray * childFile = [manager subpathsAtPath:path];
//逐个删除缓存文件
        for (NSString *fileName in childFile) {
            NSString * absolutPat = [path stringByAppendingPathComponent:fileName];
            [manager removeItemAtPath:absolutPat error:nil];
        }
//删除sdwebimage的缓存
        [[SDWebImageManager sharedManager].imageCache clearMemory];
    }
//这里是又调用了得到缓存文件大小的方法，是因为不确定是否删除了所有的缓存，所以要计算一遍，展示出来
    [self getCacheSize];
}