iOS清理缓存 2016-04-19

//计算缓存文件的大小
- (NSString *)getCacheSize
{
    //定义变量存储总的缓存大小
    long long sumSize = 0;
   
    //01.获取当前图片缓存路径
    NSString *cacheFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
   
    //02.创建文件管理对象
    NSFileManager *filemanager = [NSFileManager defaultManager];
   
    //获取当前缓存路径下的所有子路径
    NSArray *subPaths = [filemanager subpathsOfDirectoryAtPath:cacheFilePath error:nil];
   
    //遍历所有子文件
    for (NSString *subPath in subPaths) {
        //1）.拼接完整路径
        NSString *filePath = [cacheFilePath stringByAppendingFormat:@"/%@",subPath];
        //2）.计算文件的大小
        long long fileSize = [[filemanager attributesOfItemAtPath:filePath error:nil]fileSize];
        //3）.加载到文件的大小
        sumSize += fileSize;
    }
    float size_m =((float)sumSize)/(1024*1024);
    return [NSString stringWithFormat:@"%.2fM",size_m];
   
}

//清理缓存
-(void)myClearCacheAction{
    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];});
}

-(void)clearCacheSuccess
{
    [self hiddenHUD];
    [self showTips:@"清除数据成功!"];
    [self.tableView reloadData];

}