Swift iOS输入法开发( 七 ) _ios自定义键盘

var topConstraint = NSLayoutConstraint(item: deleteButton, attribute: .Top, relatedBy: .Equal, toItem: view, attribute: .Top, multiplier: 1.0, constant: +10.0)

view.addConstraints([rightSideConstraint, topConstraint])

隐藏键盘
当被按下时，这个会在er上调用。

func addHideKeyboardButton() {
hideKeyboardButton = UIButton.buttonWithType(.System) as UIButton
hideKeyboardButton.setTitle("Hide Keyboard", forState: .Normal)
hideKeyboardButton.sizeToFit()
hideKeyboardButton.setTranslatesAutoresizingMaskIntoConstraints(false)
hideKeyboardButton.addTarget(self, action: "dismissKeyboard", forControlEvents: .TouchUpInside)
view.addSubview(hideKeyboardButton)
var rightSideConstraint = NSLayoutConstraint(item: hideKeyboardButton, attribute: .Right, relatedBy: .Equal, toItem: view, attribute: .Right, multiplier: 1.0, constant: -10.0)
var bottomConstraint = NSLayoutConstraint(item: hideKeyboardButton, attribute: .Bottom, relatedBy: .Equal, toItem: view, attribute: .Bottom, multiplier: 1.0, constant: -10.0)
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