IOS隐藏手机号码****显示

// 隐藏手机号码6-10位显示*
- (NSString *)ConvertStr:(NSString *)str
{
    NSMutableString * phoneStr = [NSMutableString stringWithString:str];
    [phoneStr replaceCharactersInRange:NSMakeRange(6, 4) withString:@"****"];
    return phoneStr;
}