ios - subview 的框架向下移动

Question

我正在尝试设置一个覆盖整个屏幕的 View 。我设置了 frame = uiView.frame 但顶部似乎有一个空间并且 frame center 似乎被向下推了。有没有办法强制 View 适合实际框架？

代码:

func showActivityIndicator(uiView: UIView) {
    container.frame = uiView.frame
    container.center = uiView.center
    container.backgroundColor = UIColor.blueColor() //UIColorFromHex(0xffffff, alpha: 0.3)

    loadingView.frame = CGRectMake(0, 0, 80, 80)
    loadingView.center = uiView.center
    loadingView.backgroundColor = UIColorFromHex(0x444444, alpha: 0.7)
    loadingView.clipsToBounds = true
    loadingView.layer.cornerRadius = 10

    activityIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
    activityIndicator.center = CGPointMake(loadingView.frame.size.width / 2, loadingView.frame.size.height / 2);

    loadingView.addSubview(activityIndicator)
    container.addSubview(loadingView)
    uiView.addSubview(container)
    activityIndicator.startAnimating()
}

图片(将背景颜色设置为蓝色以显示我的意思)

Answer 1

为了覆盖整个屏幕，您需要将 View 添加到主 UIWindow，否则它将始终位于选项卡栏和导航栏下方。也无需设置中心和框架。只需确保 subview 框架等于父 View 边界(而不是框架)。请参阅此处以获取解释:UIView frame, bounds and center

试试这个:

    // Get the main window
    let window: UIWindow = (UIApplication.sharedApplication().windows.first as UIWindow)

    // Match the size of the overlay view to the window
    container.frame = window.bounds

    // Add it to the window as a subview
    window.addSubview(overlayView)

如果您想在导航栏下方添加加载指示器覆盖层，只需将其添加到 View Controller View 即可。此代码假定它在 View Controller 内运行(因此 self = View Controller )

    container.frame = self.view.bounds
    self.view.addSubview(container)