ios - UIActivityIndi​​cator 显示一瞬间

Question

当用户在呈现下一个 View 之前点击按钮时，我试图为我的应用程序显示一个旋转事件指示器 - 它有点有效，我瞬间看到了它

@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!
@IBOutlet weak var eventsbtn: UIButton!
@IBOutlet weak var pubsbtn: UIButton!
override func viewWillAppear(animated: Bool) {

    myActivityIndicator.stopAnimating()
    myActivityIndicator.hidden = true
}
override func viewDidLoad() {
    super.viewDidLoad()

    eventsbtn.layer.cornerRadius = 8
    pubsbtn.layer.cornerRadius = 8
}



@IBAction func getEvents(sender: AnyObject) {

    myActivityIndicator.hidden = false
    myActivityIndicator.startAnimating()
}

Answer 1

重构您的代码。您不需要停止 viewWillAppear 中的事件指示器。您可以将其隐藏在viewDidLoad中。代码如下:

@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!
@IBOutlet weak var eventsbtn: UIButton!
@IBOutlet weak var pubsbtn: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()

    eventsbtn.layer.cornerRadius = 8
    pubsbtn.layer.cornerRadius = 8
    myActivityIndicator.hidden = true

}

@IBAction func getEvents(sender: AnyObject) {

    myActivityIndicator.hidden = false
    myActivityIndicator.startAnimating()
}

确保用于事件指示器的 IBOutlet 和用于获取事件的 IBAction 在 Interface Builder 中正确连接。