更新 - 使用 CocoaPods
我创建了一个简单的 pod PhotoCropController,其中包括一个基本的照片裁剪控制器,该控制器将从 PHPickerViewControllerDelegate 呈现。它提供转换以推送到模态呈现的控制器并弹出或关闭。裁剪视图的纵横比也可以编辑。要使用使您的视图控制器符合 PhotoCropDelegate 协议,并从您的 PHPickerViewControllerDelegate 呈现 PhotoCropController。实现将如下所示:
extension ViewController: PHPickerViewControllerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, PhotoCropDelegate {
func browsePhotoLibrary() {
if #available(iOS 14, *) {
var config = PHPickerConfiguration()
config.filter = PHPickerFilter.images
config.selectionLimit = 1
config.preferredAssetRepresentationMode = .compatible
let picker = PHPickerViewController(configuration: config)
picker.delegate = self
let nav = UINavigationController(rootViewController: picker)
nav.setNavigationBarHidden(true, animated: false)
nav.setToolbarHidden(true, animated: true)
present(nav, animated: true) } else {
let picker = UIImagePickerController()
picker.delegate = self
picker.allowsEditing = true
present(picker, animated: true)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let edited = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
image = edited
} else if let selected = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
image = selected
}
presentedViewController?.dismiss(animated: true)
}
@available(iOS 14, *)
func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
if let provider = results.last?.itemProvider,
provider.canLoadObject(ofClass: UIImage.self) {
provider.loadObject(ofClass: UIImage.self) { [weak self] result, error in
if let image = result as? UIImage {
DispatchQueue.main.async { self?.select(image: image) }
} else if let error = error {
NSLog("Error picking image: %@", error.localizedDescription)
DispatchQueue.main.async { picker.dismiss(animated: true) }
}
}
} else { DispatchQueue.main.async { picker.dismiss(animated: true) } }
}
func select(image: UIImage) {
let destinationSize = AVMakeRect(aspectRatio: image.size, insideRect: view.frame).integral.size
//Best Performance
let resizedImage = UIGraphicsImageRenderer(size: destinationSize).image { (context) in
image.draw(in: CGRect(origin: .zero, size: destinationSize))
}
let cropController = PhotoCropController()
cropController.delegate = self
cropController.image = resizedImage
presentedViewController?.present(cropController, animated: true)
}
@objc func cropViewDidCrop(image: UIImage?) {
self.image = image
presentedViewController?.dismiss(animated: true) { [weak self] in
self?.presentedViewController?.dismiss(animated: true)
}
}
}
在 PHPickerViewController 前面模态显示另一个控制器:
您的视图控制器的 presentViewController 属性将是您的 photoPickerController,因此您可以在其前面显示另一个控制器,如下所示:
present(photoPickerController, animated: true)
presentedViewController?.present(yourViewController, animated: true)
如果从presentedViewController 中关闭,您将需要调用两次,一次关闭yourViewController,然后再次关闭photoPickerController,如果它们都出现了:
presentedViewController?.dismiss(animated: true)
presentedViewController?.dismiss(animated: true)
在导航堆栈顶部推送自定义控制器
要创建推送到 PHPickerViewController 堆栈的外观,您可以使用自定义 UIPresentationController 和 UIViewControllerAnimatedTransitioning 类来呈现您的视图。以下类将模拟对模态呈现的导航控制器的推送:
import UIKit
import PhotosUI
class SlideInModalPresentationController: UIPresentationController {
var offset: CGFloat = 0.0
override func containerViewWillLayoutSubviews() {
super.containerViewWillLayoutSubviews()
presentedView?.frame.origin.y = offset
presentedView?.frame.size.height -= offset
presentedView?.layer.cornerRadius = 10
presentedView?.clipsToBounds = true
}
}
class SlideInTransition: NSObject, UIViewControllerAnimatedTransitioning {
private let duration = 0.3
var isPresenting: Bool = true
var dismissModally: Bool = false
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return duration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let toController = transitionContext.viewController(forKey: .to),
let fromController = transitionContext.viewController(forKey: .from)
else { return}
if isPresenting {
toController.view.frame.origin.x = fromController.view.frame.width
transitionContext.containerView.addSubview(toController.view)
UIView.animate(withDuration: duration, animations: {
toController.view.frame.origin.x = 0
}, completion: { _ in
transitionContext.completeTransition(true)
})
} else if dismissModally {
var stack: UIView? = nil
if #available(iOS 14, *), toController is PHPickerViewController {
stack = toController.view.superview
toController.dismiss(animated: false)
} else if toController is UIImagePickerController {
stack = toController.view.superview
toController.dismiss(animated: false)
}
UIView.animate(withDuration: duration, animations: {
stack?.frame.origin.y = fromController.view.frame.height
fromController.view.frame.origin.y = fromController.view.frame.height
}, completion: { _ in
transitionContext.completeTransition(true)
fromController.view.removeFromSuperview()
})
} else {
UIView.animate(withDuration: duration, animations: {
fromController.view.frame.origin.x = fromController.view.frame.width
}, completion: { _ in
transitionContext.completeTransition(true)
fromController.view.removeFromSuperview()
})
}
}
}
要在您的视图控制器中实现:
class ViewController: UIViewController {
let slidInTransition = SlideInTransition()
}
extension ViewController: UIViewControllerTransitioningDelegate {
private func presentYourController(_ image: UIImage) {
let yourController = YourController()
yourController.image = image
yourController.modalPresentationStyle = .custom
yourController.transitioningDelegate = self
slidInTransition.dismissModally = false
presentedViewController?.present(yourController, animated: true)
}
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
let presentationController = SlideInModalPresentationController(presentedViewController: presented, presenting: presenting)
presentationController.offset = view.convert(source.view.frame, to: nil).origin.y + 10
return presentationController
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
slidInTransition.isPresenting = true
return slidInTransition
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
slidInTransition.isPresenting = false
return slidInTransition
}
private func dismissPhotoStack() {
slidInTransition.dismissModally = true
presentedViewController?.dismiss(animated: true)
}
}
当您准备好关闭整个堆栈时,您可以调用dismissPhotoStack。