清除缓存

/**
 *  清除缓存
 */
+(void)clearCache{
    dispatch_async(
       dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
       , ^{
           NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];

           NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];
           NSLog(@"files :%lu",(unsigned long)[files count]);
           for (NSString *p in files)
           {
               NSError *error;
               NSString *path = [cachPath stringByAppendingPathComponent:p];
               if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
                   [[NSFileManager defaultManager] removeItemAtPath:path error:&error];
               }
           }
           [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});

}
/**
 *  清理成功
 */
-(void)clearCacheSuccess
{
    NSLog(@"清理成功");
}