ios 存在键盘时如何使 UITextView 向上移动

How to make a UITextView move up when keyboard is present

提问by Bug

How to move UITextViewUp and Down when you start entering some value. Like in TextField we use its delegate method. What to do in case of UITextView?

当您开始输入某个值时如何上下移动UITextView。就像在 TextField 中一样，我们使用它的委托方法。在UITextView 的情况下怎么办？

采纳答案by Bhrigesh

While editing complete View will move up and after done editing will move down...

编辑完成时，视图将向上移动，完成编辑后将向下移动...

- (void)textViewDidBeginEditing:(UITextView *)textView
{
   [self animateTextView: YES];
 }

- (void)textViewDidEndEditing:(UITextView *)textView
 {
   [self animateTextView:NO];
  }

- (void) animateTextView:(BOOL) up
    {
        const int movementDistance =heightKeyboard; // tweak as needed
        const float movementDuration = 0.3f; // tweak as needed
        int movement= movement = (up ? -movementDistance : movementDistance);
        NSLog(@"%d",movement);

        [UIView beginAnimations: @"anim" context: nil];
        [UIView setAnimationBeginsFromCurrentState: YES];
        [UIView setAnimationDuration: movementDuration];
        self.view.frame = CGRectOffset(self.inputView.frame, 0, movement);
        [UIView commitAnimations];
    }

I hope this will help you...

我希望这能帮到您...

回答by laucel

I suggest you to take a look at this guide

我建议你看看这个指南

in particular at section: Moving Content That Is Located Under the Keyboard. I have used this approach successfully several times.

特别是在部分：移动位于键盘下的内容。我已经多次成功地使用了这种方法。

回答by Iducool

Here is a sample code that will handle the keyboard automatically for you. Keyboard avoiding

这是一个示例代码，它将为您自动处理键盘。键盘避让

If you are using TableView then your tableView must be a subclass of TPKeyboardAvoidingTableViewand if you are using scrollview then your scrollview must be a subclass of TPKeyboardAvoidingScrollView. And this library will automatically do keyboard handling for you.

如果你正在使用的TableView那么你的tableView必须是一个子类TPKeyboardAvoidingTableView，如果你使用的是滚动视图那么你的滚动视图必须是一个子类TPKeyboardAvoidingScrollView。这个库会自动为你做键盘处理。

回答by iPhone 7

I did by changing the frame.

我是通过改变框架来做到的。

-(void)textViewDidBeginEditing:(UITextView *)textView{

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:viewMsg cache:YES];
viewMsg.frame = CGRectMake(10, 50, 300, 200);
[UIView commitAnimations];

NSLog(@"Started editing target!");

}

-(void)textViewDidEndEditing:(UITextView *)textView
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:viewMsg cache:YES];
viewMsg.frame = CGRectMake(10, 150, 300, 200);
[UIView commitAnimations];
}

回答by Maulik Kundaliya

#define kOFFSET_FOR_KEYBOARD 80.0

-(void)keyboardWillShow {
    // Animate the current view out of the way
    if (self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
    else if (self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}

-(void)keyboardWillHide {
    if (self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
    else if (self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if ([sender isEqual:mailTf])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    }
}

//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view

    CGRect rect = self.view.frame;
    if (movedUp)
    {
        // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
        // 2. increase the size of the view so that the area behind the keyboard is covered up.
        rect.origin.y -= kOFFSET_FOR_KEYBOARD;
        rect.size.height += kOFFSET_FOR_KEYBOARD;
    }
    else
    {
        // revert back to the normal state.
        rect.origin.y += kOFFSET_FOR_KEYBOARD;
        rect.size.height -= kOFFSET_FOR_KEYBOARD;
    }
    self.view.frame = rect;

    [UIView commitAnimations];
}


- (void)viewWillAppear:(BOOL)animated
{
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

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

- (void)viewWillDisappear:(BOOL)animated
{
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

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

try This CODE.....

试试这个代码.....