IOS如何替换电话号码中间4位为"-"符号

- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view.  //电话号码 UILabel *telLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 200, 20)]; telLabel.textColor = [UIColor grayColor]; telLabel.text = @"13793333281"; //字符串的截取 NSString *string = [telLabel.text substringWithRange:NSMakeRange(4,4)]; //字符串的替换 telLabel.text = [telLabel.text stringByReplacingOccurrencesOfString:string withString:@"----"]; [self.view addSubview:telLabel];}