iOS 8.3 自定义键盘中的“UIView-Encapsulated-Layout-Width”

我已经实现了自定义键盘。它在运行 iOS 8.2 的设备上运行良好。

但是，当我在 iOS 8.3 的设备上运行相同的代码时，我收到以下警告，并且键盘的高度设置不正确：

Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x15dd1da0 h=-&- v=-&- Keyboard:0x15db2b00.width == UIView:0x15da7b90.width - 320>",
    "<NSLayoutConstraint:0x15dd2520 'UIView-Encapsulated-Layout-Width' H:[UIView:0x15da7b90(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x15dd2520 'UIView-Encapsulated-Layout-Width' H:[UIView:0x15da7b90(0)]>

我不懂这啥意思。请帮我弄清楚。

    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x15dd1da0 h=-&- v=-&- Keyboard:0x15db2b00.width == UIView:0x15da7b90.width - 320>",
    "<NSLayoutConstraint:0x15dd2520 'UIView-Encapsulated-Layout-Width' H:[UIView:0x15da7b90(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x15dd2520 'UIView-Encapsulated-Layout-Width' H:[UIView:0x15da7b90(0)]>

它告诉你它无法同时满足所有约束。

你有一个限制<NSAutoresizingMaskLayoutConstraint:0x15dd1da0 h=-&- v=-&- Keyboard:0x15db2b00.width == UIView:0x15da7b90.width - 320>，这表明键盘的宽度等于键盘的宽度UIView at 0x15da7b90负320（检查调试器是哪一个，我通常会查看GUI调试器，如果我知道是什么UIViews 可能是导致问题的原因）。

另一个相互冲突的约束是<NSLayoutConstraint:0x15dd2520 'UIView-Encapsulated-Layout-Width' H:[UIView:0x15da7b90(0)]>，它决定了宽度UIView at 0x15da7b90（同上）为0。它不能同时满足这一点和上面的一项，所以破坏了这一点。

我发现你的第一个约束是以下类型之一NSAutoresizingMaskLayoutConstraint，所以你可以尝试设置setTranslatesAutoresizingMaskIntoConstraints根据您的观点，将其设置为 false，这可能会消除第一个约束，从而消除冲突。

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