NSFileManager——沙盒

 NSString * webPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Private Documents/Temp"];
    NSFileManager * fileManage = [NSFileManager defaultManager];
    if (![fileManage fileExistsAtPath:webPath]) {
        [fileManage createDirectoryAtPath:webPath withIntermediateDirectories:YES attributes:nil error:nil];
        
    }