[英]Controls not dimming when view controller is presented locally and alert displayed
当我在视图控制器上显示UIAlertController
,控件将按预期变暗。
但是,如果同一视图控制器本身是模态呈现的,则警报控制器的显示不会使控件变暗(两个按钮保持蓝色)。
如何使呈现的视图控制器本身正确处理呈现并使其控件变暗?
这是一个小示例项目。 相关代码在MainViewController.swift
。
到目前为止,我最好的解决方法是使用一个自定义的UIAlertController
子类,使用transitionCoordinator
设置tintAdjustmentMode
及其出现/消失的动画:
/// A `UIAlertController` that can udpates its presenting view controller's `tintAdjustmentMode` code as it appears and disappears
class TintAdjustingAlertController: UIAlertController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
animatePresentingViewTintAdjustmentMode(tintAdjustmentMode: .dimmed, forViewControllerAtKey: .from)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
animatePresentingViewTintAdjustmentMode(tintAdjustmentMode: .automatic, forViewControllerAtKey: .to)
}
private func animatePresentingViewTintAdjustmentMode(tintAdjustmentMode mode: UIView.TintAdjustmentMode, forViewControllerAtKey key: UITransitionContextViewControllerKey) {
transitionCoordinator?.animate(alongsideTransition: { context in
if let presentingNavigationController = context.viewController(forKey: key) as? UINavigationController {
presentingNavigationController.navigationBar.tintAdjustmentMode = mode
presentingNavigationController.viewControllers.forEach { $0.view.tintAdjustmentMode = mode }
} else if let presentingViewController = context.viewController(forKey: key) {
presentingViewController.view.tintAdjustmentMode = mode
}
}, completion: nil)
}
}
这行得通,但是我希望不必在我的整个代码中都使用它。 还是想知道a)是否有一种简单的方法可以按预期进行此工作,或者b)如果这确实是iOS错误,是否有更优雅的解决方法?
我还为此提交了雷达: http : //www.openradar.me/radar?id=6113750608248832
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