導航欄顏色不存儲

Question

我有兩個不同導航欄的視圖控制器。每個導航欄都有不同的顏色。

VC1 and VC2

如果我從VC1移動到VC2我會看到不同的顏色，但如果回遷，我會從VC2 VC1導航欄的顏色看。

View Controller 1 Returned

所以從VC1導航欄的顏色是不保存正確

VC1：

import UIKit 

class TableViewController_1: UITableViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     self.navigationController?.navigationBar.barTintColor = UIColor(red: 56.0/255.0, green: 208.0/255.0, blue: 125.0/255.0, alpha: 1.00) 

     // Uncomment the following line to preserve selection between presentations 
     // self.clearsSelectionOnViewWillAppear = false 

     // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
     // self.navigationItem.rightBarButtonItem = self.editButtonItem() 
    } 

VC2：

import UIKit 

class TableViewController_2: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     self.navigationController?.navigationBar.barTintColor = UIColor(red: 105.0/255.0, green: 28.0/255.0, blue: 56.0/255.0, alpha: 1.00) 

     // Uncomment the following line to preserve selection between presentations 
     // self.clearsSelectionOnViewWillAppear = false 

     // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
     // self.navigationItem.rightBarButtonItem = self.editButtonItem() 
    } 

如何使固定導航欄顏色VC1 ？謝謝你的幫助！

Answer 1

而不是改變導航欄的顏色在viewDidLoad中，做到在viewWillAppear中：

VC1

override func viewWillAppear(_ animated: Bool) { 
     self.navigationController?.navigationBar.barTintColor = UIColor(red: 56.0/255.0, green: 208.0/255.0, blue: 125.0/255.0, alpha: 1.00) 
    } 

VC2

override func viewWillAppear(_ animated: Bool) { 
     self.navigationController?.navigationBar.barTintColor = UIColor(red: 105.0/255.0, green: 28.0/255.0, blue: 56.0/255.0, alpha: 1.00) 
    } 

Answer 2

如果你現在從VC1到VC2，他們有不同的導航控制器。所以，導航欄顏色不應該有任何問題。因爲他們使用不同的導航。但是，如果您從VC1推送到VC​​2，並且從VC2移回VC1時，應該在方法viewWillAppear中設置VC1的導航欄顏色。因爲當你移回到VC1時，由於已經在內存中創建了VC1，所以它會連續運行viewWillAppear，而不是viewDidLoad。