CustomPresenter
关于
CustomPresenter 是 UIViewControllerAnimatedTransitioning 的一个实现，它是一套用于实现自定义视图控制器转换动画的方法（更多信息请参阅这里）。
该库为视图控制器的显示（CustomControllerPresentationAnimator）和消失（CustomControllerDismissAnimator）提供了实现。通过显示上下文可以自定义转换。
protocol CustomControllerPresentationContext {
// Transition properties
var backgroundViewForPresentation: UIView? { get set }
var backgroundAlpha: CGFloat { get }
var duration: TimeInterval { get }
var animationSpringDumping: CGFloat? { get }
var animationInitialSpringVelocity: CGFloat? { get }
// Optional object that controls presentation/dismissal animation
var animationDriver: CustomControllerPresentationAnimationDriver? { get }
// Final frame of presented view controller or initial frame of dismissed one;
// `transitionedView` is presented view during presentation, or dismissed one if we are undergoing dismissal
func controllerFrame(for containerView: UIView, transitionedView: transitionedView) -> CGRect
}配置
要使用 CustomPresenter 与您的视图控制器，需要遵循以下3个步骤
- 将视图控制器的
modalPresentationStyle设置为.custom - 创建一个实现
CustomControllerPresentationContext的实例，该实例将描述转换（不用担心，所有属性都有默认值，所以需要的努力很少）。 - 确保您的视图控制器成为
transitioningDelegate并实现代理方法。
class MyViewController: UIViewController {
private class MyPresentationContext: CustomControllerPresentationContext {}
private var myPresentationContext = MyPresentationContext()
}
extension MyViewController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return CustomControllerPresentationAnimator(presentationContext: myPresentationContext)
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return CustomControllerDismissAnimator(presentationContext: myPresentationContext)
}
}重要
请注意，如果您在包裹在 UINavigationController 中的视图控制器中进行显示，则必须确保导航控制器上将 modalPresentationStyle 设置为 .custom，并且将 transitioningDelegate 设置为实现它（如上面示例中所示的）视图控制器。
要求
iOS 8, Swift 4
安装
Cocoapods
CustomPresenter通过CocoaPods提供。要安装它，只需将以下行添加到您的Podfile中
pod 'CustomPresenter'Carthage
只需将其添加到您的Cartfile中
github "azubala/CustomPresenter"
作者
Aleksander Zubala | zubala.com
许可证
CustomPresenter在MIT许可证下提供。更多详细信息请参见LICENSE文件。