swift - 自定义键盘 iOS 8 中的 UIActivityIndi​​catorView 不会快速设置动画

Question

我正在快速做一个 iOS 8 自定义键盘，我已经在 View 中添加了一个 UIActivityIndi​​catorView，问题是我可以看到它，但不旋转，它是静态的，这是代码:

@IBOutlet var menuLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    self.load_indicator = UIActivityIndicatorView(frame: CGRectMake(0,0, 50, 50)) as UIActivityIndicatorView
    self.load_indicator.hidesWhenStopped = true
    self.load_indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
    self.view.addSubview(self.load_indicator)
}

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

    dispatch_async(dispatch_get_main_queue(), {
        self.load_indicator.startAnimating()
        })
}

出现加载指示器，但它是静态的，我该怎么办？

Answer 1

load_indicator = UIActivityIndicatorView(frame: CGRectMake(0,0, 50, 50))
load_indicator.hidesWhenStopped = true
load_indicator.startAnimating()
load_indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
view.addSubview(load_indicator)  

你需要用

开始动画

load_indicator.startAnimating()

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