我正在使用这个很棒的video为我的项目创建自定义过渡，因为我正在为iPad开发，所以我不想让目标 View Controller 全屏显示，而是希望它占据整个屏幕的一半，如下所示:
我的自定义过渡类代码是:
class CircularTransition: NSObject {
var circle = UIView()
var startingPoint = CGPoint.zero {
didSet {
circle.center = startingPoint
}
}
var circleColor = UIColor.white
var duration = 0.4
enum circularTransitionMode: Int {
case present, dismiss
}
var transitionMode = circularTransitionMode.present
}
extension CircularTransition: UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return duration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let containerView = transitionContext.containerView
if transitionMode == .present {
if let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to) {
var viewCenter = presentedView.center
var viewSize = presentedView.frame.size
if UIDevice.current.userInterfaceIdiom == .pad {
viewCenter = CGPoint(x: viewCenter.x, y: viewSize.height)
viewSize = CGSize(width: viewSize.width, height: viewSize.height)
}
circle = UIView()
circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
circle.layer.cornerRadius = circle.frame.size.width / 2
circle.center = startingPoint
circle.backgroundColor = circleColor
circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
containerView.addSubview(circle)
presentedView.center = startingPoint
presentedView.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
presentedView.alpha = 0
containerView.addSubview(presentedView)
UIView.animate(withDuration: duration, animations: {
self.circle.transform = CGAffineTransform.identity
presentedView.transform = CGAffineTransform.identity
presentedView.alpha = 1
presentedView.center = viewCenter
}, completion: {(sucess: Bool) in transitionContext.completeTransition(sucess)})
}
} else {
if let returningView = transitionContext.view(forKey: UITransitionContextViewKey.from) {
let viewCenter = returningView.center
let viewSize = returningView.frame.size
circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
circle.layer.cornerRadius = circle.frame.size.width / 2
circle.center = startingPoint
UIView.animate(withDuration: duration + 0.1, animations: {
self.circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
returningView.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
returningView.center = self.startingPoint
returningView.alpha = 0
}, completion: {(success: Bool) in
returningView.center = viewCenter
returningView.removeFromSuperview()
self.circle.removeFromSuperview()
transitionContext.completeTransition(success)
})
}
}
}
func frameForCircle(withViewCenter viewCenter: CGPoint, size viewSize: CGSize, startPoint: CGPoint) -> CGRect {
let xLength = fmax(startingPoint.x, viewSize.width - startingPoint.x)
let yLength = fmax(startingPoint.y, viewSize.height - startingPoint.y)
let offsetVector = sqrt(xLength * xLength + yLength * yLength) * 2
let size = CGSize(width: offsetVector, height: offsetVector)
return CGRect(origin: CGPoint.zero, size: size)
}
}
还有我的 View Controller 中的代码部分:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let secondVC = segue.destination as! ResultViewController
secondVC.transitioningDelegate = self
secondVC.modalPresentationStyle = .custom
}
// MARK: - Animation
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transtion.transitionMode = .dismiss
transtion.startingPoint = calculateButton.center
transtion.circleColor = calculateButton.backgroundColor!
return transtion
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transtion.transitionMode = .present
transtion.startingPoint = calculateButton.center
transtion.circleColor = calculateButton.backgroundColor!
return transtion
}
但是 Controller 显示全屏。
最佳答案
至此，我已经完成了答案的创建。与其他答案所采用的方法不同，所以请耐心等待。
我认为最好的方法不是添加容器 View ，而是创建UIViewController子类(我称为CircleDisplayViewController)。然后，所有需要具有此功能的VC都可以从中继承(而不是从UIViewController)。
这样，您呈现和关闭ResultViewController的所有逻辑都可以在一个地方处理，并且可以在应用程序中的任何位置使用。
VC可以使用它的方式如下:
class AnyViewController: CircleDisplayViewController {
/* Only inherit from CircleDisplayViewController,
otherwise you inherit from UIViewController twice */
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func showCircle(_ sender: UIButton) {
openCircle(withCenter: sender.center, radius: nil, resultDataSource: calculator!.iterateWPItems())
//I'll get to this stuff in just a minute
//Edit: from talking to Bright Future in chat I saw that resultViewController needs to be setup with calculator!.iterateWPItems()
}
}
其中showCircle将使用过渡委托(delegate)将您的ResultViewController呈现为圆心在发送UIButtons中心。
CircleDisplayViewController子类是这样的:
class CircleDisplayViewController: UIViewController, UIViewControllerTransitioningDelegate, ResultDelegate {
private enum CircleState {
case collapsed, visible
}
private var circleState: CircleState = .collapsed
private var resultViewController: ResultViewController!
private lazy var transition = CircularTransition()
func openCircle(withCenter center: CGPoint, radius: CGFloat?, resultDataSource: ([Items], Int, String)) {
let circleCollapsed = (circleState == .collapsed)
DispatchQueue.main.async { () -> Void in
if circleCollapsed {
self.addCircle(withCenter: center, radius: radius, resultDataSource: resultDataSource)
}
}
}
private func addCircle(withCenter circleCenter: CGPoint, radius: CGFloat?, resultDataSource: ([Items], Int, String])) {
var circleRadius: CGFloat!
if radius == nil {
circleRadius = view.frame.size.height/2.0
} else {
circleRadius = radius
}
//instantiate resultViewController here, and setup delegate etc.
resultViewController = UIStoryboard.resultViewController()
resultViewController.transitioningDelegate = self
resultViewController.delegate = self
resultViewController.modalPresentationStyle = .custom
//setup any values for resultViewController here
resultViewController.dataSource = resultDataSource
//then set the frame of resultViewController (while also setting endFrame)
let resultOrigin = CGPoint(x: 0.0, y: circleCenter.y - circleRadius)
let resultSize = CGSize(width: view.frame.size.width, height: (view.frame.size.height - circleCenter.y) + circleRadius)
resultViewController.view.frame = CGRect(origin: resultOrigin, size: resultSize)
resultViewController.endframe = CGRect(origin: resultOrigin, size: resultSize)
transition.circle = UIView()
transition.startingPoint = circleCenter
transition.radius = circleRadius
transition.circle.frame = circleFrame(radius: transition.radius, center: transition.startingPoint)
present(resultViewController, animated: true, completion: nil)
}
func collapseCircle() { //THIS IS THE RESULT DELEGATE FUNCTIONS
dismiss(animated: true) {
self.resultViewController = nil
}
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.transitionMode = .dismiss
transition.circleColor = UIColor.red
return transition
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.transitionMode = .present
transition.circleColor = UIColor.red
return transition
}
func circleFrame(radius: CGFloat, center: CGPoint) -> CGRect {
let circleOrigin = CGPoint(x: center.x - radius, y: center.y - radius)
let circleSize = CGSize(width: radius*2, height: radius*2)
return CGRect(origin: circleOrigin, size: circleSize)
}
}
public extension UIStoryboard {
class func mainStoryboard() -> UIStoryboard { return UIStoryboard(name: "Main", bundle: Bundle.main) }
}
private extension UIStoryboard {
class func resultViewController() -> ResultViewController {
return mainStoryboard().instantiateViewController(withIdentifier: "/* Your ID for ResultViewController */") as! ResultViewController
}
}
从DisplayCircleViewController继承的VC调用的唯一函数是openCircle，openCircle具有circleCenter参数(应该是我猜测的按钮中心)，可选的radius参数(如果为nil，则默认值为一半)。查看高度，然后设置ResultViewController需要执行任何其他操作。
在addCircle函数中，有一些重要的东西:
您需要设置ResultViewController，但是在演示之前必须这样做(就像您准备进行测试一样)，
然后为其设置框架(我尝试将其设置为可见的圆形区域，但在此处相当粗糙，可能值得尝试)，
然后在这里重置过渡圆(而不是在过渡类中)，以便可以在此处设置圆的起点，半径和框架。
那只是正常的礼物。
如果尚未为ResultViewController设置标识符，则需要这样做(请参见UIStoryboard扩展)
我还更改了TransitioningDelegate函数，因此您无需设置圆心，这是因为为了使其具有通用性，我将这一职责赋予了继承自此函数的ViewController。 (请参见代码的最高位)
最后，我更改了CircularTransition类
我添加了一个变量:
var radius: CGFloat = 0.0 //set in the addCircle function above
并更改了animateTransition:
(删除了注释行):
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let containerView = transitionContext.containerView
if transitionMode == .present {
if let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to) {
...
// circle = UIView()
// circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
circle.layer.cornerRadius = radius
...
}
} else {
if let returningView = transitionContext.view(forKey: UITransitionContextViewKey.from) {
...
// circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
...
}
}
}
最后，我制定了一个协议(protocol)，以便ResultViewController可以消除圆圈
protocol ResultDelegate: class {
func collapseCircle()
}
class ResultViewController: UIViewController {
weak var delegate: ResultDelegate!
var endFrame: CGRect!
var dataSource: ([Items], Int, String)! // same as in Bright Future's case
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidLayoutSubviews() {
if endFrame != nil {
view.frame = endFrame
}
}
@IBAction func closeResult(_ sender: UIButton) {
delegate.collapseCircle()
}
}
事实证明，这是一个很大的答案，对此我感到很抱歉，我匆忙写了一下，所以如果不清楚，请说。
希望这可以帮助!
编辑:我发现了问题，iOS 10更改了它们布局 View 的方式，因此，为了解决此问题，我在ResultViewController中添加了endFrame属性，并将其 View 框架设置为viewDidLayoutSubviews中的框架。我还在addCircle中同时设置了frame和endFrame。我更改了上面的代码以反射(reflect)更改。这不是理想的方法，但是稍后再看，看是否有更好的修复方法。
编辑:这看起来像是对我开放