替换电话号码中间4位为"-"号
这个效果的实现很简单，首先截取需要替换成＊号的内容，然后再进行替换
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//电话号码 UILabel *telLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, yy+30, 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];
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