如何在导航栏Swift右侧添加自定义视图？
问题描述：
我正在 UINavigationBar 右侧添加 自定义视图 。我尝试的是以下内容，但视图没有显示出来！请帮助，提前谢谢！
I am trying to add a custom view on right of UINavigationBar. What I tried is the following, but the view is not showing up! Please help, thanks in advance!
let viewOnrightButton = UIView(frame: CGRect(x: 2, y: 2, width: 60, height: 22))
// viewOnrightButton.frame = CGRectMake(2, 2, 60, 22)
viewOnrightButton.layer.cornerRadius = 2
viewOnrightButton.backgroundColor = UIColor(red: 0.961, green: 0.827, blue: 0.239, alpha: 1.00)
lblNumbersOfBanana.frame = CGRectMake(2, 1, viewOnrightButton.frame.width-20, 20)
lblNumbersOfBanana.text = "001"
var bananaImgView = UIImageView(frame: CGRect(x: viewOnrightButton.frame.width-22, y: 0, width: 20, height: 20))
// bananaImgView.frame = CGRectMake(viewOnrightButton.frame.width-22, 0, 20, 20)
bananaImgView.image = UIImage(named: "banana")
viewOnrightButton.addSubview(lblNumbersOfBanana)
viewOnrightButton.addSubview(bananaImgView)
self.navigationItem.rightBarButtonItem?.customView = viewOnrightButton
答
//创建uiview并添加thre e自定义按钮
// creating uiview and add three custom buttons
func addRightButton(){
let viewFN = UIView(frame: CGRectMake(0, 0, 180,40))
viewFN.backgroundColor = UIColor.yellowColor()
let button1 = UIButton(frame: CGRectMake(0,8, 40, 20))
button1.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
button1.setTitle("one", forState: .Normal)
button1.addTarget(self, action: #selector(self.didTapOnRightButton), forControlEvents: UIControlEvents.TouchUpInside)
let button2 = UIButton(frame: CGRectMake(40, 8, 60, 20))
button2.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
button2.setTitle("tow", forState: .Normal)
let button3 = UIButton(frame: CGRectMake(80, 8, 60, 20))
button3.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
button3.setTitle("three", forState: .Normal)
button3.addTarget(self, action: #selector(self.didTapOnRightButton), forControlEvents: UIControlEvents.TouchUpInside)
viewFN.addSubview(button1)
viewFN.addSubview(button2)
viewFN.addSubview(button3)
let rightBarButton = UIBarButtonItem(customView: viewFN)
self.navigationItem.rightBarButtonItem = rightBarButton
}