iOS：AppDelegate中的SwiftAccess按钮-iOS:SwiftAccessbuttoninAppDelegate

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Access your ViewController via the rootViewController option:

通过rootViewController选项访问ViewController:

let viewCOntroller= self.window!.rootViewController as! ViewController
viewController.btn_stop.hidden = false // Found nil error

But even in this case it will find nil. The viewController is instantiated but not loaded yet. You should probably unhide the button in the viewDidLoad function of the ViewController.

但即使在这种情况下它也会找到零。 viewController已实例化但尚未加载。您应该取消隐藏ViewController的viewDidLoad函数中的按钮。