[英]Swift iOS -NSMutableAttributedString Not Presenting ViewController?
[英]presenting ViewController with NavigationViewController swift
我有系統“NavigationViewController - > MyViewController”,我編程想要在第三個視圖控制器中呈現MyViewController。 問題是我在呈現它之后在MyViewController中沒有導航欄。 你能幫助我嗎?
var VC1 = self.storyboard.instantiateViewControllerWithIdentifier("MyViewController") as ViewController
self.presentViewController(VC1, animated:true, completion: nil)
調用presentViewController
在現有導航堆棧之外以模態 presentViewController
呈現視圖控制器; 它不包含在您的UINavigationController或任何其他內容中。 如果您希望新視圖控制器具有導航欄,則有兩個主要選項:
選項1.將新視圖控制器推送到現有導航堆棧,而不是以模態方式呈現:
let VC1 = self.storyboard!.instantiateViewControllerWithIdentifier("MyViewController") as! ViewController
self.navigationController!.pushViewController(VC1, animated: true)
選項2.將新視圖控制器嵌入到新的導航控制器中,並以模態方式顯示新的導航控制器:
let VC1 = self.storyboard!.instantiateViewControllerWithIdentifier("MyViewController") as! ViewController
let navController = UINavigationController(rootViewController: VC1) // Creating a navigation controller with VC1 at the root of the navigation stack.
self.present(navController, animated:true, completion: nil)
請記住,此選項不會自動包含“后退”按鈕。 你必須自己建立一個緊密的機制。
哪個最適合您的是人機界面設計問題,但通常清楚哪些是最有意義的。
SWIFT 3
let VC1 = self.storyboard!.instantiateViewController(withIdentifier: "MyViewController") as! MyViewController
let navController = UINavigationController(rootViewController: VC1)
self.present(navController, animated:true, completion: nil)
我的導航欄沒有顯示,所以我在Swift 2 iOS 9中使用了以下方法
let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("Dashboard") as! Dashboard
// Creating a navigation controller with viewController at the root of the navigation stack.
let navController = UINavigationController(rootViewController: viewController)
self.presentViewController(navController, animated:true, completion: nil)
我使用了UIViewController的擴展和一個結構來確保我的當前視圖是從收藏夾中顯示的
1.構建全球Bool
struct PresentedFromFavourites {
static var comingFromFav = false}
2.UIVeiwController擴展:通過“stefandouganhyde - Option 2”在第二個選項中以模態方式呈現並解決后面的問題
extension UIViewController {
func returnToFavourites()
{
// you return to the storyboard wanted by changing the name
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let mainNavigationController = storyBoard.instantiateViewController(withIdentifier: "HomeNav") as! UINavigationController
// Set animated to false
let favViewController = storyBoard.instantiateViewController(withIdentifier: "Favourites")
self.present(mainNavigationController, animated: false, completion: {
mainNavigationController.pushViewController(favViewController, animated: false)
})
}
// call this function in viewDidLoad()
//
func addBackToFavouritesButton()
{
if PresentedFromFavourites.comingFromFav
{
//Create a button
// I found this good for most size classes
let buttonHeight = (self.navigationController?.navigationBar.frame.size.height)! - 15
let rect = CGRect(x: 2, y: 8, width: buttonHeight, height: buttonHeight)
let aButton = UIButton(frame: rect)
// Down a back arrow image from icon8 for free and add it to your image assets
aButton.setImage(#imageLiteral(resourceName: "backArrow"), for: .normal)
aButton.backgroundColor = UIColor.clear
aButton.addTarget(self, action:#selector(self.returnToFavourites), for: .touchUpInside)
self.navigationController?.navigationBar.addSubview(aButton)
PresentedFromFavourites.comingFromFav = false
}
}}
接受的答案很棒。 這不是答案,只是對問題的說明。
我提出了一個像這樣的viewController:
在vc1里面:
func showVC2() {
if let navController = self.navigationController{
navController.present(vc2, animated: true)
}
}
在vc2里面:
func returnFromVC2() {
if let navController = self.navigationController {
navController.popViewController(animated: true)
}else{
print("navigationController is nil") <-- I was reaching here!
}
}
正如'stefandouganhyde'所說:“它不是由你的UINavigationController或任何其他包含的”
新解決方案:
func returnFromVC2() {
dismiss(animated: true, completion: nil)
}
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