Question

如何实现被键盘遮挡时，带有textfield的tableview自动上移

Answer 1

您好，很高兴为您解答。

用通知
step 1：
在进入视图的时候添加监视：（viewDidLoad什么的）

// Observe keyboard hide and show notifications to resize the text view appropriately. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotifi
cation object:nil];
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotifi
cation object:nil];

    

step 2:

在键盘动作的时候移动视图：

- (void)keyboardWillShow:(NSNotification *)notification { 
NSDictionary *userInfo = [notification userInfo];
 
// Get the origin of the keyboard when it's displayed.
  NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserIn
foKey]; 
// Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
 CGRect keyboardRect = [aValue CGRectValue];
 keyboardRect = [self.view convertRect:keyboardRect fromView:nil];
 CGFloat keyboardTop = keyboardRect.origin.y;
  CGRect newTextViewFrame = self.view.bounds;
  newTextViewFrame.size.height = keyboardTop - self.view.bounds.origin.y;
 
// Get the duration of the animation.
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurat
ionUserInfoKey];
NSTimeInterval animationDuration;
 
 [animationDurationValue getValue:&animationDuration];
 // Animate the resize of the text view's frame in sync with the keyboard's appearance.
 [UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:animationDuration];
 
 textView.frame = newTextViewFrame;
[UIView commitAnimations];
}- (void)keyboardWillHide:(NSNotification *)notification { 
NSDictionary* userInfo = [notification userInfo];
 
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurat
ionUserInfoKey];
NSTimeInterval animationDuration;
 [animationDurationValue getValue:&animationDuration];
 
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:animationDuration];
 textView.frame = self.view.bounds;
 
[UIView commitAnimations];
}

   

step 3:
在退出视图的时候注销通知
viewDidUnload:

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

   

dealloc:

[[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil];

    

代码摘自apple sample code KeyboardAccessory.细节修改下

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