iOS 8键盘隐藏了我的文本视图

我有一个UIViewController呈现使用self.accountViewController.modalPresentationStyle = UIModalPresentationFormSheet; 现在在iOS 8中，最后一个UITextView在键盘上被隐藏起来。 如何避免它？

Answer 1

@奥列格的解决scheme是好的，但它没有考虑到键盘尺寸的变化，而它已经显示..他也硬编码的animation持续时间和其他一些参数。 见下面我的解决scheme：

将UIKeyboardWillChangeFrameNotification的观察者添加到viewDidLoad

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardFrameWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil]; 

然后添加方法：

 - (void)keyboardFrameWillChange:(NSNotification *)notification { CGRect keyboardEndFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue]; CGRect keyboardBeginFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue]; UIViewAnimationCurve animationCurve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue]; NSTimeInterval animationDuration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] integerValue]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:animationDuration]; [UIView setAnimationCurve:animationCurve]; CGRect newFrame = self.view.frame; CGRect keyboardFrameEnd = [self.view convertRect:keyboardEndFrame toView:nil]; CGRect keyboardFrameBegin = [self.view convertRect:keyboardBeginFrame toView:nil]; newFrame.origin.y -= (keyboardFrameBegin.origin.y - keyboardFrameEnd.origin.y); self.view.frame = newFrame; [UIView commitAnimations]; } 

不要忘记在viewDidUnload和Dealloc中删除键盘观察者。

Answer 2

为了解决你的问题，你应该改变frame或constrain的textview 。

小提示给你：

使用通知来检测键盘何时显示或隐藏。

通知示例：

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; 

而不是改变上面提到的参数之一。

改变框架的例子：

 - (void)keyboardWillHide:(NSNotification *)notification { [self.view layoutIfNeeded]; [UIView animateWithDuration:0.2 animations:^{ [self setStartingFrame:self.commentsView.frame.size.height - commentViewOutlet_.frame.size.height - tabBarOffset_]; [self.view layoutIfNeeded]; }]; } 

Answer 3

上面的@ newton_guima的答案迅速版本 incase任何人都想要它。

将UIKeyboardWillChangeFrameNotification观察者添加到viewDidLoad() ：

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardFrameWillChange:", name: UIKeyboardWillChangeFrameNotification, object: nil) 

然后添加这个方法：

 func keyboardFrameWillChange(notification: NSNotification) { let keyboardBeginFrame = (notification.userInfo! as NSDictionary).objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue let keyboardEndFrame = (notification.userInfo! as NSDictionary).objectForKey(UIKeyboardFrameEndUserInfoKey)!.CGRectValue let animationCurve = UIViewAnimationCurve(rawValue: (notification.userInfo! as NSDictionary).objectForKey(UIKeyboardAnimationCurveUserInfoKey)!.integerValue) let animationDuration: NSTimeInterval = (notification.userInfo! as NSDictionary).objectForKey(UIKeyboardAnimationDurationUserInfoKey)!.doubleValue UIView.beginAnimations(nil, context: nil) UIView.setAnimationDuration(animationDuration) UIView.setAnimationCurve(animationCurve!) var newFrame = self.view.frame let keyboardFrameEnd = self.view.convertRect(keyboardEndFrame, toView: nil) let keyboardFrameBegin = self.view.convertRect(keyboardBeginFrame, toView: nil) newFrame.origin.y -= (keyboardFrameBegin.origin.y - keyboardFrameEnd.origin.y) self.view.frame = newFrame; UIView.commitAnimations() } 

然后移除观察者，无论您从视图转移还是deinit ：

 NSNotificationCenter.defaultCenter().removeObserver(self)