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弹框淡入淡出的效果 如 自定义alert弹框
设置modalPresentationStyle，modalTransitionStyle
let detailController = LZCenterDetailViewController()
detailController.modalPresentationStyle = .custom
detailController.modalTransitionStyle = .crossDissolve
self.present(detailController, animated: true)
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用 UIPresentationController 实现pop 转场动画 (有demo)
效果
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主要实现代码
//
// MOPresentationController.swift
// MOCustomTransitionAnimation
//
// Created by LiZhi on 2023/11/26.
// Copyright © 2023 LiZhi. All rights reserved.
//
import UIKit
class MOPresentationController: UIPresentationController {
// presentVC 在动画容器上的 frame
override var frameOfPresentedViewInContainerView: CGRect {
get {
print(self, #line, "frameOfPresentedViewInContainerView")
let containerBounds: CGRect = self.containerView?.bounds ?? .zero
let width = CGFloat(floorf(Float(containerBounds.size.width) / 2.0))
let height = containerBounds.size.height
let originX = containerBounds.size.width - width
return CGRect(x: originX, y: 0.0, width: width, height: height)
}
}
// MARK: - 将要开始 present，设置初始值 和 动画回调
override func presentationTransitionWillBegin() {
super.presentationTransitionWillBegin()
print(self, #line, "presentationTransitionWillBegin")
// 1. get animation container view (获取动画容器视图)
guard let containerView = containerView else { return }
// 2. set initial value for animation views and add to container view (设置动画视图的初始值， 并添加到都到容器上)
self.moDimmingView.frame = containerView.bounds
self.moDimmingView.alpha = 0.0
containerView.insertSubview(self.moDimmingView, at: 0)
// 3. execute animation (执行动画)
// 这里尝试去拿一个时间点的回调，能拿到就在回调里执行显示动画；拿不到就直接设置显示
guard let transitionCoordinator = self.presentedViewController.transitionCoordinator else {
self.moDimmingView.alpha = 1.0
return
}
transitionCoordinator.animateAlongsideTransition(in: self.presentedView) { context in
self.moDimmingView.alpha = 1.0
}
}
// MARK: - present 动画结束
override func presentationTransitionDidEnd(_ completed: Bool) {
super.presentationTransitionDidEnd(completed)
print(self, #line, "presentationTransitionDidEnd")
// remove dark background view when transition fail
if !completed {
self.moDimmingView.removeFromSuperview()
}
}
// MARK: - 将要开始 dismiss，设置初始值 和 动画回调
override func dismissalTransitionWillBegin() {
super.dismissalTransitionWillBegin()
print(self, #line, "dismissalTransitionWillBegin")
guard let transitionCoordinator = self.presentedViewController.transitionCoordinator else {
self.moDimmingView.alpha = 0.0
return
}
transitionCoordinator.animateAlongsideTransition(in: self.presentedView) { context in
self.moDimmingView.alpha = 0.0
}
}
// MARK: - dismiss 动画结束
override func dismissalTransitionDidEnd(_ completed: Bool) {
super.dismissalTransitionDidEnd(completed)
print(self, #line, "dismissalTransitionDidEnd")
if completed {
self.moDimmingView.removeFromSuperview()
}
}
// 暗色背景
lazy var moDimmingView: UIView = {
let view = UIView(frame: .zero)
view.backgroundColor = UIColor(white: 0.0, alpha: 0.4)
view.alpha = 0.0
return view
}()
}
参考地址 ：blog.csdn.net/Margaret_MO…
demo地址：github.com/lizhi0123/L…
