ios - 截取屏幕截图，然后将其保存到相机胶卷。 swift 4.2，Xcode 10

Question

我从互联网上找到了一个源代码，可以从当前屏幕截取屏幕截图，然后将其保存到相机胶卷。但是当我点击下面的按钮时出现错误

@IBAction func btnTakeScreenShot(_ sender: UIButton) {
    self.takeScreenshot()
}

open func takeScreenshot(_ shouldSave: Bool = true) -> UIImage? {
    print("takeScreenshot")
    var screenshotImage :UIImage?
    let layer = UIApplication.shared.keyWindow!.layer
    let scale = UIScreen.main.scale
    UIGraphicsBeginImageContextWithOptions(layer.frame.size, false, scale);
    guard let context = UIGraphicsGetCurrentContext() else {return nil}
    layer.render(in:context)
    screenshotImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    if let image = screenshotImage, shouldSave {
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }
    return screenshotImage
}

错误截图如下:

我有两个问题:

(1) 我是否应该从 Xcode 用户的build设置窗口授予任何权限以将其保存到相机胶卷？如果是的话，你能说清楚它是什么吗？ (点击 HTTP 链接的权限:App Transport Security Settings, Allow Arbitrary Loads ..)

(2) 你知道为什么这个源代码会报错吗？这个源代码是否可以正常获取屏幕截图并将其保存到相机胶卷？

Swift 4.2, Xcode 10

Answer 1

您应该检查控制台是否有以下错误，

This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSPhotoLibraryAddUsageDescription key with a string value explaining to the user how the app uses this data.

所以只需在 Info.plist 文件中添加 NSPhotoLibraryAddUsageDescription 键。