关于ios：UItextview在iphone app中上下移动（键盘出现和消失时）

UItextview move up and down in iphone app( when keyboard appear and disappear)

本问题已经有最佳答案，请猛点这里访问。

当键盘出现或消失时，如何在iPhone应用程序中的UIScrollView中上下移动UItextview。

其中一种方法是——>在viewDidLoad或ViewWillAppear中添加这些观察者

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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(keyboardDisappeared) name:UIKeyboardWillHideNotification object:nil];
[center addObserver:self selector:@selector(keyboardAppeared) name:UIKeyboardWillShowNotification object:nil];

将keyboardDisappeared和keyboardAppeared写如下

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-(void) keyboardDisappeared
{
[UIView beginAnimations:@"animate" context:nil];
[UIView setAnimationDuration:0.2f];
[UIView setAnimationBeginsFromCurrentState: NO];
self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y+100(same as you do in keyboardAppeared), self.view.frame.size.width, self.view.frame.size.height);
[UIView commitAnimations];
}

-(void) keyboardAppeared
{
[UIView beginAnimations:@"animate" context:nil];
[UIView setAnimationDuration:0.2f];
[UIView setAnimationBeginsFromCurrentState: NO];
self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y-(as much you want), self.view.frame.size.width, self.view.frame.size.height);
[UIView commitAnimations];
}

更新：

斯威夫特3×4 / X

添加这些观察者-

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NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

以及选择器方法：

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@objc func keyboardWillShow(notification:NSNotification) {
adjustView(show: true, notification: notification)
}

@objc func keyboardWillHide(notification:NSNotification) {
adjustView(show: false, notification: notification)
}

func adjustView(show:Bool, notification:NSNotification) {
var userInfo = notification.userInfo!
let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let animationDurarion = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! TimeInterval
let changeInHeight = (keyboardFrame.size.height + 40/*or any value as per need*/) * (show ? 1 : -1)
UIView.animate(withDuration: animationDurarion, animations: { () -> Void in
// change height Constraint or change height with changeInHeight here to your UItextView/other view
})

}

别忘了删除观察者！！！！

相关讨论

只需在-viewDidLoad或-viewWillAppear:中添加键盘操作的通知观察器：

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NSNotificationCenter * notificationCetner = [NSNotificationCenter defaultCenter];
[notificationCetner addObserver:self
selector:@selector(_keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
[notificationCetner addObserver:self
selector:@selector(_keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];

然后在-_keyboardWasShown:和-_keyboardWillHide:方法中更新文本视图的框架。

有一个叫TPKeyboardAvoiding的好图书馆，你可以使用(在这里找到它)。

或者，您可以自己编程，并使用UIScrollView的contentOffset属性将内容向下或向上移动。然后，您应该听键盘的keyboardDidShow和keyboardWillHide方法。

希望它有帮助！

首先设置textview的委托，然后尝试实现这些方法….

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- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
[self scrollViewToCenterOfScreen:textView];
return YES;
}

- (void) scrollViewToCenterOfScreen:(UIView *)theView
{
CGFloat viewCenterY = theView.center.y;
CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];

CGFloat availableHeight = applicationFrame.size.height - 300; // Remove area covered by keyboard

CGFloat y = viewCenterY - availableHeight / 2.0;

if (y < 0)
{
y = 0;
}
[scrollView setContentOffset:CGPointMake(0, y) animated:YES];
}

// -------- Modified --------

- (BOOL)textView:(UITextView *)txtView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)tempText
{
if( [tempText rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]].location == NSNotFound )
{
return YES;
}

[txtView resignFirstResponder];
[self.scrollView setContentOffset:CGPointMake(0.0f, 0.0f) animated:TRUE];
return NO;
}