在 Playground 中使用实时照片

Working with Live Photos in Playground(在 Playground 中使用实时照片)

问题描述

我已经在网上进行了大量搜索，但我目前正在尝试在 Playground 中使用实时照片".我知道框架(PHLivePhoto)，我只是不知道是否可以在 Playground 中使用它们，因为没有太多导入"，因为似乎没有任何实时照片"可用用于在线下载.有什么想法吗?

I've done a fair amount of searching the web, but I'm currently attempting to work with "Live Photos" in Playground. I'm aware of the framework (PHLivePhoto), I just have no clue if working with them in Playground is possible due to that fact that there's not much to "import" as there doesn't seem to be any "Live Photos" available for download online. Any ideas?

推荐答案

可以在 Playground从实际 Live Photo 的元素中制作和查看 PHLivePhoto.

It's possible to make and view a PHLivePhoto in the Playground from the elements of an actual Live Photo.

在 OS X 的 Photos 应用中，选择一张 Live Photo 并转到菜单

In OS X's Photos app, select a Live Photo and go to menu

文件 > 导出 > 导出原始文件...

File > Export > Export original...

它将创建一个 .JPG 和一个 .mov.

It will create a .JPG and a .mov.

将这两个文件放到 Playground 的 Resources 文件夹中(菜单 View > Navigator > Show Project Navigator).

Drop these two files in the Resources folder of the Playground (menu View > Navigators > Show Project Navigator).

使用 NSBundle 获取这两个文件的 URL(在我的示例中，文件是IMG_0001.JPG"和IMG_0001.mov"):

Get the URLs for these two files with NSBundle (in my example the files are "IMG_0001.JPG" and "IMG_0001.mov"):

let imgURL = NSBundle.mainBundle().URLForResource("IMG_0001", withExtension: "JPG")!
let movURL = NSBundle.mainBundle().URLForResource("IMG_0001", withExtension: "mov")!

并创建一个实际图像，我们将需要它用于 Live Photo 预览图像:

And create an actual image, we will need it for the Live Photo preview image:

let prevImg = UIImage(named: "IMG_0001.JPG")!

导入必要的框架:

import Photos
import PhotosUI
import XCPlayground

并将 Playground 设置为异步模式:

And set the Playground in asynchronous mode:

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

现在我们将使用 PHLivePhoto 的 requestLivePhotoWithResourceFileURLs 方法从我们的元素创建一个 PHLivePhoto:

Now we're going to use PHLivePhoto's requestLivePhotoWithResourceFileURLs method to create a PHLivePhoto from our elements:

func makeLivePhotoFromItems(imageURL: NSURL, videoURL: NSURL, previewImage: UIImage, completion: (livePhoto: PHLivePhoto) -> Void) {
    PHLivePhoto.requestLivePhotoWithResourceFileURLs([imageURL, videoURL], placeholderImage: previewImage, targetSize: CGSizeZero, contentMode: PHImageContentMode.AspectFit) {
        (livePhoto, infoDict) -> Void in
        // for debugging: print(infoDict)
        if let lp = livePhoto {
            completion(livePhoto: lp)
        }
    }
}

然后我们这样调用:

makeLivePhotoFromItems(imgURL, videoURL: movURL, previewImage: prevImg) { (livePhoto) -> Void in
    // "livePhoto" is your PHLivePhoto object
}

例如，假设您希望 Playground 进行实时取景:

For example, let's say you want the Playground to make a live view:

makeLivePhotoFromItems(imgURL, videoURL: movURL, previewImage: prevImg) { (livePhoto) -> Void in
    let rect = CGRect(x: 0, y: 0, width: 2048, height: 1536)
    let livePhotoView = PHLivePhotoView(frame: rect)
    livePhotoView.livePhoto = livePhoto
    XCPlaygroundPage.currentPage.liveView = livePhotoView
    livePhotoView.startPlaybackWithStyle(PHLivePhotoViewPlaybackStyle.Full)
}

请注意，由于无法与实时视图交互来开始播放实时照片，我们必须自己使用 PHLivePhotoView 的 startPlaybackWithStyle 方法来完成.

Note that since there's no way to interact with the live view to start the playback of the Live Photo we have to do it ourselves with PHLivePhotoView's startPlaybackWithStyle method.

您可以通过在菜单中显示助手编辑器来强制实时视图出现在 Playground 中

You can force the live view to appear in the Playground by showing the Assistant Editor in menu

查看 > 助理编辑器 > 显示助理编辑器

View > Assistant Editor > Show Assistant Editor

注意:Playground 可能需要一些时间来创建 PHLivePhoto 并启动实时取景.

借助 Xcode 7.3b+，我们终于可以在 Playgrounds 中进行一些 UI 交互了.

With Xcode 7.3b+ we can finally have some UI interaction in Playgrounds.

我已经用一个简单的视图和 touchesBegan 对这个答案进行了改编，只需在控制台这样说时单击 LivePhoto:

I've made an adaptation of this answer with a simple view and touchesBegan, just click the LivePhoto when the console says so:

import UIKit
import XCPlayground

import Photos
import PhotosUI

class PLView: UIView {

    let image: UIImage
    let imageURL: NSURL
    let videoURL: NSURL

    let liveView: PHLivePhotoView

    init(image: UIImage, imageURL: NSURL, videoURL: NSURL) {
        self.image = image
        self.imageURL = imageURL
        self.videoURL = videoURL
        let rect = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)
        self.liveView = PHLivePhotoView(frame: rect)
        super.init(frame: rect)
        self.addSubview(self.liveView)
    }

    func prepareLivePhoto() {
        makeLivePhotoFromItems { (livePhoto) in
            self.liveView.livePhoto = livePhoto
            print("
Ready! Click on the LivePhoto in the Assistant Editor panel!
")
        }
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        print("
Clicked! Wait for it...
")
        self.liveView.startPlaybackWithStyle(.Full)
    }

    private func makeLivePhotoFromItems(completion: (PHLivePhoto) -> Void) {
        PHLivePhoto.requestLivePhotoWithResourceFileURLs([imageURL, videoURL], placeholderImage: image, targetSize: CGSizeZero, contentMode: .AspectFit) {
            (livePhoto, infoDict) -> Void in
            // This "canceled" condition is just to avoid redundant passes in the Playground preview panel.
            if let canceled = infoDict[PHLivePhotoInfoCancelledKey] as? Int where canceled == 0 {
                if let livePhoto = livePhoto {
                    completion(livePhoto)
                }
            }
        }
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}



XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

let plview = PLView(image: UIImage(named: "IMG_0001.JPG")!,
                 imageURL: NSBundle.mainBundle().URLForResource("IMG_0001", withExtension: "JPG")!,
                 videoURL: NSBundle.mainBundle().URLForResource("IMG_0001", withExtension: "mov")!)

XCPlaygroundPage.currentPage.liveView = plview

plview.prepareLivePhoto()

<小时>

Swift 3.0.2 (Xcode 8.2.1) 的相同示例:

import UIKit
import PlaygroundSupport
import Photos
import PhotosUI

class PLView: UIView {

    let image: UIImage
    let imageURL: URL
    let videoURL: URL

    let liveView: PHLivePhotoView

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    init(image: UIImage, imageURL: URL, videoURL: URL) {
        self.image = image
        self.imageURL = imageURL
        self.videoURL = videoURL
        let rect = CGRect(x: 0, y: 0, width: 300, height: 400)
        self.liveView = PHLivePhotoView(frame: rect)
        super.init(frame: rect)
        self.addSubview(self.liveView)
    }

    func prepareLivePhoto() {
        makeLivePhotoFromItems { (livePhoto) in
            self.liveView.livePhoto = livePhoto
            print("
Ready! Click on the LivePhoto in the Assistant Editor panel!
")
        }
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        print("
Clicked! Wait for it...
")
        self.liveView.startPlayback(with: .full)
    }

    private func makeLivePhotoFromItems(completion: @escaping (PHLivePhoto) -> Void) {
        PHLivePhoto.request(withResourceFileURLs: [imageURL, videoURL], placeholderImage: image, targetSize: CGSize.zero, contentMode: .aspectFit) {
            (livePhoto, infoDict) -> Void in

            if let canceled = infoDict[PHLivePhotoInfoCancelledKey] as? NSNumber,
                canceled == 0,
                let livePhoto = livePhoto
            {
                completion(livePhoto)
            }
        }
    }

}

let plview = PLView(image: UIImage(named: "IMG_0001.JPG")!,
                    imageURL: Bundle.main.url(forResource: "IMG_0001", withExtension: "JPG")!,
                    videoURL: Bundle.main.url(forResource: "IMG_0001", withExtension: "mov")!)

PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.liveView = plview

plview.prepareLivePhoto()

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