[英]Swift 4 - How to set and show a new root view controller from current view controller
Struggling a couple of days with this... 在这方面挣扎了几天...
I have set a rootVC
from AppDelegate
in didFinishLaunchingWithOptions
and this is working fine. 我已经在didFinishLaunchingWithOptions
从AppDelegate
设置了rootVC
,并且工作正常。
Now from that rootVC
I want that, if some condition is met, eg. 现在从rootVC
我希望,如果满足某些条件,例如。 if x=y
a new rootVC
is set and displayed. if x=y
则设置并显示一个新的rootVC
。
I stack overflowed long long time, found different solutions, but none is working. 我的堆栈很长一段时间都溢出了,找到了不同的解决方案,但是没有一个起作用。
The below is compiling, and executing, I checked with breakpoint, but nothing shows up in the app. 下面是编译并执行的程序,我检查了断点,但应用程序中未显示任何内容。
animated Bool false
self Regional2.IrelandViewController 0x0000000102b0ff30
newViewController Regional2.IrelandMain 0x0000000102d0d300
customViewControllersArray NSArray 0x00000001c000b620
ObjectiveC.NSObject NSObject
Exception State Registers
far unsigned long 0x00000001b0a7ba78
esr unsigned int 0x92000007
exception unsigned int 0x00000000
Floating Point Registers
General Purpose Registers
and the piece of the code . 和一段代码。 . 。 . 。
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let newViewController = self.storyboard?.instantiateViewController(withIdentifier: "IrelandMain") as! IrelandMain
let customViewControllersArray : NSArray = [newViewController]
self.navigationController?.viewControllers = customViewControllersArray as! [UIViewController]
self.navigationController?.pushViewController(newViewController, animated: true)
} }
Please notice that navigationController
show produces the same output. 请注意, navigationController
show会产生相同的输出。 Nothing changes. 没有什么变化。
That code works for me. 该代码对我有用。 It simply replaces the whole UIWindow. 它只是替换了整个UIWindow。
When I tried to only replace the rootViewController it did it but it created another one (so I had two loaded viewControllers in the view hierarchy) 当我尝试只替换rootViewController时,它做到了,但是又创建了另一个(所以我在视图层次结构中加载了两个viewControllers)
if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
// If we only reloads the rootViewController than the main window has 2 subviews
// The older cannot be removed and the new can be removed.
// The workaround I found is to replace the whole UIWindow with new one
let root = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateInitialViewController()
let newWindow = UIWindow()
appDelegate.replaceWindow(newWindow)
newWindow.rootViewController = root
}
And in your AppDelegate 并在您的AppDelegate中
func replaceWindow(_ newWindow: UIWindow) {
if let oldWindow = window {
newWindow.frame = oldWindow.frame
newWindow.windowLevel = oldWindow.windowLevel
newWindow.screen = oldWindow.screen
newWindow.isHidden = false
window = newWindow
oldWindow.removeFromSuperview()
}
}
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