一旦小部件消失，哪些功能被调用？

Question

什么是小部件生命周期？首先调用哪个函数？

Answer 1

viewDidLoad()在视图生命周期中只调用一次。

根据您的需要，使用：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // do stuff you want to do before the view actually appears
} 

或：

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    // do stuff you want to do when the view appears
} 

有关UIView生命周期访问Apples Documentation

的详细信息