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+ (void)deleteFiles:(NSString *)path;{
// 1. 判斷文件還是目錄
NSFileManager * fileManger = [NSFileManager defaultManager]; 
BOOL isDir = NO;
BOOL isExist = [fileManger fileExistsAtPath:pathisDirectory:&isDir];
// 2.  判斷是不是目錄
if (isExist) {
    if (isDir) {
 NSArray * dirArray = [fileMangercontentsOfDirectoryAtPath:path error:nil];
 NSString * subPath = nil;
        for (NSString * str in dirArray) {
 subPath = [pathstringByAppendingPathComponent:str];
 BOOL issubDir = NO; 
[fileManger fileExistsAtPath:subPath isDirectory:&issubDir];
 [self deleteFiles:subPath];
                }
 }else{ NSLog(@"%@",path);
 [manager removeItemAtPath:filePath error:nil];
       }
}else{
NSLog(@"你打印的是目錄或者是不存在 ");
      }
}