viewDidLoad、viewWillAppear等ViewController事件發生順序介紹

viewDidLoad、viewWillAppear、viewDidAppear… 啊！這些到底是什麼啊？看着都暈了！不過沒關係，只要我們看看通過Swift代碼撰寫的例子，一定很快就能明白這一系列ViewController事件的發生順序啦～

先用視頻來看看準確順序

viewDidLoad

View 被載入時：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    println("viewDidLoad")
}

viewWillAppear

View 要被呈現前，發生於 viewDidLoad 之後：

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    println("viewWillAppear")
}

viewDidAppear

View 呈現後，發生於 viewWillAppear 之後：

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    println("viewDidAppear")
}

viewWillDisappear

View 要結束前，要切換到下一個 View 時會發生此事件：

override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)

    println("viewWillDisappear")
}

viewDidDisappear

View 完全結束後，發生於 viewWillDisappear 之後：

override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)
        
    println("viewDidDisappear")
}

原文鏈接

http://www.arefly.com/ios-view-controller-event/