iphone - 如何在自定义 UIView 类中设置基于键盘的 Textview 上移动画

Question

我在一个文本视图中有自定义 UIView 类。自定义 View 类框架仅设置某个视图控制器。我的想法是当文本视图委托方法 textviewdidbeginediting 基于键盘高度的文本视图动画无法正常工作时。我正在使用以下代码

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;
- (void)textViewDidBeginEditing:(UITextView *)textView {
CGRect textFieldRect=
[self.window convertRect:textView.bounds fromView:textView];
CGRect viewRect =[self.window convertRect:self.bounds fromView:self];
//So now we have the bounds, we need to calculate the fraction between the top and bottom of the middle section for the text field's midline:
CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator = midline - viewRect.origin.y
- MINIMUM_SCROLL_FRACTION * viewRect.size.height;
CGFloat denominator =(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)* viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
//Clamp this fraction so that the top section is all "0.0" and the bottom section is all "1.0".
if (heightFraction < 0.0)
{
    heightFraction = 0.0;
}
else if (heightFraction > 1.0)
{
    heightFraction = 1.0;
}

//    Now take this fraction and convert it into an amount to scroll by multiplying by the keyboard height for the current screen orientation. Notice the calls to floor so that we only scroll by whole pixel amounts.
UIInterfaceOrientation orientation =
[[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait ||orientation == UIInterfaceOrientationPortraitUpsideDown)
{
    animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
}
else
{
    animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
//Finally, apply the animation. Note the use of setAnimationBeginsFromCurrentState: — this will allow a smooth transition to new text field if the user taps on another.

CGRect viewFrame = self.frame;
viewFrame.origin.y -= animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self setFrame:viewFrame];

[UIView commitAnimations];

 }

-(void)textViewDidEndEditing:(UITextView *)textView{
CGRect viewFrame = self.frame;
viewFrame.origin.y += animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

[self setFrame:viewFrame];
[UIView commitAnimations];
 }

并附上了我的屏幕截图

如何解决这个问题

Answer 1

您并使用动画移动您的 textView ，

这是代码，你可以根据你的设置框架

-(void)makeAnimation
{
    yourView.alpha = 0;
    CGRect optionsFrame = yourView.frame;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:.5];

    CGRect optionsFrame2  = {0,0,320,266};
    yourView.frame  = optionsFrame2;
    yourView.alpha=1;
    [UIView commitAnimations];
}