iOS 小技巧总结

代码版本：

 NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"点击注册代表您已经同意我们的《用户协议》"];
    NSRange strRange = {14,6};
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor colorInSkinWithKey:@"useColor1"] range:strRange];  //设置颜色
    [str addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:strRange];

//因为是   NSMutableAttributedString  所以要使用

[_radioButton setAttributedTitle:str forState:UIControlStateNormal];

经常看新手一个一个输入框的收键盘，其实一句话就好了：

@interface UIView (UITextField)
- (BOOL)endEditing:(BOOL)force;    // use to make the view or any subview that is the first responder resign (optionally force)
@end

[view.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]; //删除所有子视图