如何不让键盘挡住UITextField控件

最新推荐文章于 2021-01-17 13:32:20 发布

转载最新推荐文章于 2021-01-17 13:32:20 发布 · 245 阅读

本文介绍两种处理iOS应用中键盘显示和隐藏时界面调整的方法。一种通过UIScrollView调整位置，另一种利用代理方法调整整个界面，确保键盘不会遮挡输入框。

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参考：

苹果的官方参考

http://www.apple.com.cn/developer/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/TextandWeb/TextandWeb.html#//apple_ref/doc/uid/TP40007072-CH20-SW3

方法一：

http://blog.163.com/joke_001/blog/static/191753316201182522223307/

UIScrollView，
当textViewShouldBeginEditing时候，
用setContentOffset函数

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
    NSLog(@"   begin editing ");
    [postScrollView setContentOffset:CGPointMake(0, 150) animated:YES];
    return YES;
}

//写完之后  在某一个事件方法中（如：发送的方法）取消焦点：[postTextView resignFirstResponder];  接下来会自动运行一下委托：

- (void)textViewDidEndEditing:(UITextView *)textView
{
    NSLog(@"   did end editing ");
    [postScrollView setContentOffset:CGPointMake(0.0, 0.0) animated:YES];
}

第二个问题解答：
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyBoard:)];
    tapGestureRecognizer.numberOfTapsRequired = 1;
    [myScrollView addGestureRecognizer: tapGestureRecognizer];   //只需要点击非文字输入区域就会响应hideKeyBoard

- (void)hideKeyBoard:（id）sender
{
  [myTextView  resignFirstResponder];
//or [myTextField resignFirstResponder];
}

也可以这样做，在UITextField的代理方法textFieldShouldBeginEditiing中，将这个view上移，然后在textFieldShouldEndEditing中将上移的view再下移（动画实现）：
上移代码：
NSTimeInterval animationDuration=0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
float width=self.view.frame.size.width;
float height=self.view.frame.size.height;
CGRect rect=CGRectMake(0.0f,-80,width,height);//上移80个单位，按实际情况设置
self.view.frame=rect;
[UIView commitAnimations];
下移类同，把frame还原即可。

方法二：

http://blog.youkuaiyun.com/silva_831/article/details/7074762

实现以下三个方法，如果弹出的键盘会遮住输入框，整体的界面会向上移动，这样就不会遮住输入框了。自己增加UITextFieldDelegate委托。
只适合iPhone,如果想要支持iPad,只要把216改成iPad上面键盘的高度即可。
C代码
- (void)keyboardWillShow:(NSNotification *)noti
{
      //键盘输入的界面调整
      //键盘的高度
      float height = 216.0;
      CGRect frame = self.view.frame;
      frame.size = CGSizeMake(frame.size.width, frame.size.height - height);
      [UIView beginAnimations:@"Curl"context:nil];//动画开始
      [UIView setAnimationDuration:0.30];
      [UIView setAnimationDelegate:self];
      [self.view setFrame:frame];
      [UIView commitAnimations];
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
// When the user presses return, take focus away from the text field so that the keyboard is dismissed.
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);
self.view.frame = rect;
[UIView commitAnimations];
[textField resignFirstResponder];
return YES;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
      CGRect frame = textField.frame;
      int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//键盘高度216
      NSTimeInterval animationDuration = 0.30f;
      [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
      [UIView setAnimationDuration:animationDuration];
      float width = self.view.frame.size.width;
      float height = self.view.frame.size.height;
      if(offset > 0)
      {
            CGRect rect = CGRectMake(0.0f, -offset,width,height);
            self.view.frame = rect;
      }
      [UIView commitAnimations];

}

另外我自己做了一点修改：
在实际用的时候，键盘消失原来的控件并没有回归都原来的位置，而是上移了20个像素，我估计是因为顶部Bar的原因，只要将22行代码改成如下就可以了：
CGRect rect = CGRectMake(0.0f, 20.0f, self.view.frame.size.width, self.view.frame.size.height);