在 iOS 9 Shortcut Bar only 模式下，与键盘顶部对齐的视图出现在错误的位置 [英] View aligned to top of keyboard appears in wrong place in iOS 9 Shortcut Bar only mode

问题描述

iOS 9 为 iOS 8 添加了
(注意红色视图是如何连接到键盘顶部的)

实际行为:

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将红色视图附加到键盘顶部的正确方法是什么?

解决方案

问题在于大多数代码 (

当键盘处于仅快捷栏模式时，这是矩形:

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请注意键盘的大部分是如何在屏幕外的，但它仍然是相同的高度.

要获得正确的行为，请使用 CGRectIntersection 与视图的边界和该视图内的键盘框架:

//✅ 好代码，使用CGRect keyboardScreenEndFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];CGRect keyboardViewEndFrame = [self.view convertRect:keyboardScreenEndFrame fromView:self.view.window];CGRect keyboardFrame = CGRectIntersection(self.view.bounds, keyboardViewEndFrame);CGFloat keyboardHeight = keyboardFrame.size.height;//= 55

出于同样的原因，应该使用 UIKeyboardFrameEndUserInfoKey 而不是 UIKeyboardFrameBeginUserInfoKey.

iOS 9 adds a Shortcut Bar to the iOS 8 QuickType bar.

As part of this change, if you connect a bluetooth keyboard to an iPad, the keyboard is in a minimized Shortcut Bar only mode (which can be simulated by pressing command-k in the simulator).

I have code which gets the keyboard height using a method similar to the following:

CGRect keyboardFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat keyboardHeight = keyboardFrame.size.height; // = 313

The problem is that when the keyboard is toggled between the expanded and collapsed state, the height remains the same, causing my view to appear in its old location:

Desired behavior:

(Notice how the red view is attached to the top of the keyboard)

Actual behavior:

What's the correct way to get the red view to be attached to the top of the keyboard?

解决方案

The problem is that most code out there (including Apple's) ignores the fact that UIKeyboardFrameEndUserInfoKey is a CGRect and not a CGSize.

// ❌ Bad code, do not use
- (void)keyboardWasShown:(NSNotification*)aNotification {
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect bkgndRect = activeField.superview.frame;
    bkgndRect.size.height += kbSize.height;
    [activeField.superview setFrame:bkgndRect];
    [scrollView setContentOffset:CGPointMake(0.0, activeField.frame.origin.y-kbSize.height) animated:YES];
}

Here you see that only the keyboard height (kbSize.height) is being used. The origin of the rect is important, and should not be ignored.

When the keyboard is visible, this is the rect that is reported:

When the keyboard is in Shortcut Bar only mode, this is the rect:

Notice how the majority of the keyboard is offscreen, yet it is still the same height.

To get the correct behavior, use CGRectIntersection with the view's bounds and the keyboard frame within that view:

// ✅ Good code, use
CGRect keyboardScreenEndFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect keyboardViewEndFrame = [self.view convertRect:keyboardScreenEndFrame fromView:self.view.window];
CGRect keyboardFrame = CGRectIntersection(self.view.bounds, keyboardViewEndFrame);
CGFloat keyboardHeight = keyboardFrame.size.height; // = 55

For this same reason, UIKeyboardFrameEndUserInfoKey should be used as opposed to UIKeyboardFrameBeginUserInfoKey.

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