我有一个UITabBarController和一个名为ScreenLocker的类,在UITabBarController / ViewDidApear中我使用回调初始化ScreenLocker,c秒后屏幕锁定器或当应用程序转到后台时应该调用此回调,
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
}
override func viewDidAppear(_ animated: Bool) {
lockAppCallBack()
}
func lockAppCallBack() {
let callBack = {
let myModalViewController = R.storyboard.authentication.authenticationViewController()
ScreenLocker.isAutoLocked = true
myModalViewController!.modalPresentationStyle = UIModalPresentationStyle.fullScreen
myModalViewController!.modalTransitionStyle = UIModalTransitionStyle.coverVertical
self.present(myModalViewController!, animated: true, completion: nil)
}
AuthenticationPatternPresenter.initScreenLocker(callBack: callBack)
}
ScreenLocker
class ScreenLocker: NSObject{
static var isAutoLocked = false
static let instance : ScreenLocker = {
let instance = ScreenLocker()
return instance
}()
var timer:Timer!
var time:Int!
var callBack = {
}
func _init(time:Int, callBack: @escaping () -> ()){
self.time = time
self.callBack = callBack
}
每个选项卡都有一个UINavigationController一切正常,但是当我更改UITabBarController的选项卡并导航到下一个视图并返回上一个视图时,选项卡的ViewDidAppear不会调用。当我删除Tab栏的ViewDidAppear时,每件事都没问题,当我在标签栏中再次添加一个空的ViewDidAppear时,出现了同样的问题。 UITabBarController的ViewDidAppear有什么问题吗?有什么建议吗?