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最正规的办法，用通知
step 1： 在进入视图的时候添加监视：（viewDidLoad什么的） 复制代码 // Observe keyboard hide and show notifications to resize the text view appropriately. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; step 2: 在键盘动作的时候移动视图： 复制代码 - (void)keyboardWillShow:(NSNotification *)notification { /* Reduce the size of the text view so that it‘s not obscured by the keyboard. Animate the resize so that it‘s in sync with the appearance of the keyboard. */ NSDictionary *userInfo = [notification userInfo]; // Get the origin of the keyboard when it‘s displayed. NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]; // 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:UIKeyboardAnimationDurationUserInfoKey]; 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]; /* Restore the size of the text view (fill self‘s view). Animate the resize so that it‘s in sync with the disappearance of the keyboard. */ NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey]; 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: 复制代码 [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil]; dealloc: 复制代码 [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil]; 这些代码是摘自apple sample code KeyboardAccessory. 些许细节自己修改下就好了，比如那个textView |
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原文地址：http://www.cnblogs.com/wangxiaorui/p/5158148.html
