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我有兩個ViewControllers。我想在導航欄上添加一個UIView。Push Segue後添加UIView在導航欄上
我可以通過創建一個UINavigationItem出口以及將所述的UIView編程創建到UINavigationItem出口titleview的在第一導航欄的頂部添加的UIView。
代碼片段（HomeVC - 拳套的ViewController）：
class HomeVC: UIViewController {
@IBOutlet weak var homeNavigationItem: UINavigationItem!
let navBarView = UIView()
let topNavBarLabel = UILabel()
let screenWidth = UIScreen.main.bounds.width
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
navBarView.frame = CGRect(x: 0.0, y: 0.0, width: screenWidth, height: 50.0)
topNavBarLabel.text = "Hello World"
topNavBarLabel.textAlignment = NSTextAlignment.center
topNavBarLabel.textColor = UIColor.white
topNavBarLabel.frame = CGRect(x: 0.0, y: 10.0, width: screenWidth, height: 20.0)
navBarView.addSubview(topNavBarLabel)
homeNavigationItem.titleView = navBarView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
截圖景觀：
現在櫃面SecondVC的我試圖做推後，同樣的事情塞格。
代碼片段（DetailVC - 第二的ViewController）：
class DetailsVC: UIViewController {
let navBarView = UIView()
let screenWidth = UIScreen.main.bounds.width
let navBarTopLabel = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
navBarView.frame = CGRect(x: 0.0, y: 50.0, width: screenWidth, height: 50.0)
navBarView.backgroundColor = UIColor.black
navBarTopLabel.frame = CGRect(x: 0.0, y: 10.0, width: screenWidth, height: 20.0)
navBarTopLabel.textColor = UIColor.white
navBarTopLabel.text = "Details Hello"
navBarTopLabel.textAlignment = NSTextAlignment.center
navBarView.addSubview(navBarTopLabel)
self.view.addSubview(navBarView)
self.view.bringSubview(toFront: navBarView)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
截圖詳情查看：
故事板截圖：
視圖層次：
注：我特意指派的Y位置到視圖大於0，以確保正在創建
的看法，但因爲我不能創建一個UINavigationItem，我將以編程方式創建的視圖添加到視圖中，甚至試圖將子視圖放在前面。
注：是的，UINavigationBar的的尺寸已經增大，請參考這裏：Change width/height UINavigationBar embedded in a Navigation Controller