在iOS 8自定义键盘中显示建议栏

Question

是否可以在自定义键盘中启用与附加快照相同的建议栏。如果没有，那么我将不得不创建自定义栏，所以我将不得不增加键盘的高度。你有代码来增加键盘的高度。

Answer 1

尝试：（viewDidAppear是UIInputViewController子类的方法）

- (void)viewDidAppear {
    [super viewDidAppear];

    CGFloat _expandedHeight = 250;
    NSLayoutConstraint *_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: _expandedHeight];
    [self.view addConstraint: _heightConstraint];
}

警告：写入 viewDidAppear: 方法

它不起作用。日志：

2014-10-01 17:10:38.532 Coloured[7232:308451] Unable to simultaneously satisfy constraints.
    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) 
(
    "<NSLayoutConstraint:0x79829970 V:[UIInputView:0x79b2f660(250)]>",
    "<NSLayoutConstraint:0x79824ea0 'UIView-Encapsulated-Layout-Height' V:[UIInputView:0x79b2f660(216)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x79829970 V:[UIInputView:0x79b2f660(250)]>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.