如何找到键盘未覆盖的视图部分（UIModalPresenationStyleFormSheet）？ [英] How can I find portion of my view which isn't covered by the keyboard (UIModalPresenationStyleFormSheet)?

问题描述

我有一个视图控制器显示带有UITextView的视图，我想在键盘出现时调整视图大小，以便键盘不会覆盖UITextView。我几乎在所有情况下都能正常工作。我仍然在iPad上看到一些奇怪的东西，只有当视图控制器出现在ModalPresentationStyleFormSheet中时，并且仅在LandscapeRight方向上，据我所知。

I've got a view controller showing a view with a UITextView, and I want to resize the view when the keyboard appears so that the UITextView isn't covered by the keyboard. I have this working correctly in almost all cases. I'm still seeing some weirdness on the iPad, only when the view controller is presented in ModalPresentationStyleFormSheet, and only in LandscapeRight orientation, as far as I can tell.

相关我的视图控制器的部分-keyboardWillShow：

Relevant parts of my view controller's -keyboardWillShow:

// We'll store my frame above the keyboard in availableFrame
CGRect availableFrame = self.view.frame;

// Find the keyboard size
NSDictionary *userInfo = [notification userInfo];
NSValue keyboardFrameScreenValue = userInfo[UIKeyboardFrameBeginUserInfoKey];
CGRect keyboardFrameScreen =  [keyboardFrameScreenValue CGRectValue];
CGRect keyboardFrame = [self.view convertRect:keyboardFrameScreen fromView:nil];
CGSize keyboardSize = keyboardFrame.size;

// Figure out how much of my frame is covered by the keyboard
CGRect screenBounds = [self.view convertRect:[UIScreen mainScreen].bounds
                                    fromView:nil];
CGRect myBoundsScreen = [self.view boundsInWindow]; // See below
CGFloat myBottom = myBoundsScreen.origin.y + myBoundsScreen.size.height;
CGFloat keyboardTop = screenBounds.size.height - keyboardSize.height;
CGFloat lostHeight = myBottom - keyboardTop;
availableFrame.size.height -= lostHeight;

- [UIView boundsInWindow]：

-[UIView boundsInWindow]:

- (CGRect)boundsInWindow {
  UIInterfaceOrientation orientation =
    [UIApplication sharedApplication].statusBarOrientation;
  CGRect bounds = [self convertRect:self.bounds toView:self.window];
  if (UIInterfaceOrientationIsLandscape(orientation)) {
    // Swap origin
    CGFloat x = bounds.origin.y;
    bounds.origin.y = bounds.origin.x;
    bounds.origin.x = x;
    // Swap size
    CGFloat width = bounds.size.height;
    bounds.size.height = bounds.size.width;
    bounds.size.width = width;
  }

  return bounds;
}

大部分时间都可以使用。当我的应用程序处于用户界面方向LandscapeRight时，我从-boundsInWindow得到的原点比它应该低得多。可能导致这种情况的原因是什么？

This works, most of the time. When my app is in user interface orientation LandscapeRight though, the origin I get from -boundsInWindow is quite a bit lower than it should be. What could be causing this?

感谢您的帮助！

推荐答案

Will的回答是正确的想法，但我必须调整一下以使其正确

Will's answer was the right idea but I had to tweak it quite a bit to get it right

extension UIView {
    func heightCoveredByKeyboardOfSize(keyboardSize: CGSize) -> CGFloat {
        let frameInWindow = convertRect(bounds, toView: nil)
        guard let windowBounds = window?.bounds else { return 0 }

        let keyboardTop = windowBounds.size.height - keyboardSize.height
        let viewBottom = frameInWindow.origin.y + frameInWindow.size.height

        return max(0, viewBottom - keyboardTop)
    }
}

这篇关于如何找到键盘未覆盖的视图部分（UIModalPresenationStyleFormSheet）？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！