自定义键盘iOS 8中的UIActivityIndi​​catorView没有动画swift

Question

我在swift中做了一个iOS 8自定义键盘，我在视图中添加了一个UIActivityIndi​​catorView，问题是我可以看到它，但是没有旋转，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，但它是静态的，我该怎么做？

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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