单击按钮时以编程方式将图像发送到新的视图控制器

Question

我正在尝试制作一个在“WebController”中加载 UIWebView 的应用程序，UIWebView 下方是一个按钮，用于截取 UIWebView 的屏幕截图并将其保存到我的 PhotoLibrary。我想将单击按钮时刚刚拍摄的照片发送到新控制器“ViewImageController”，并插入到 ViewImageController 中的 UIImageView 中以编辑或执行其他操作。我试图在我的 WebController 中使用 segue 将图像发送到我的 ViewImageController。我看过很多关于在视图控制器之间传递图像的文章，但我只发现它们处理我没有使用的 UIImagePickerController 委托，因为我试图发送一张刚刚拍摄的照片而不是拍摄照片，然后选择该图像从 ImagePicker 发送。如果不清楚，请告诉我，以便我尝试更好地解释。

WebController.swift

var sendImage:UIImage!
....
....
....
@IBAction func takePhotoBtn(_ sender: UIButton) {
    print("Screenshot")
    // = UIImage
    UIGraphicsBeginImageContext(webPageView.frame.size)
    if let aContext = UIGraphicsGetCurrentContext(){
        webPageView.layer.render(in: aContext)
    }
    var viewImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(viewImage!, nil, nil, nil)
    viewImage = sendImage
    self.performSegue(withIdentifier: "viewLargePhoto", sender: AnyObject.self)

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let viewImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    if segue.identifier == "viewLargePhoto" {
        var viewPhotoController = segue.destination as! ViewPhotoController
        //Line beneath is the trouble causer
        viewPhotoController.imageView = sendImage//Cannot assign value of type 'UIImage!' to type 'UIImageView!'
    }
}

ViewPhotoController.swift

@IBOutlet weak var imageView: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {
    self.navigationController?.hidesBarsOnTap = true
    self.displayPhoto()
}
....
....
....
func displayPhoto(){
    let screenSize: CGSize = UIScreen.main.bounds.size
    let targetSize = CGSize(width: screenSize.width, height: screenSize.height)

    let imageManager = PHImageManager.default()
    imageManager.requestImage(for: self.photoAsset[self.index] as! PHAsset, targetSize: targetSize, contentMode: .aspectFit, options: nil, resultHandler: {(result,info)->Void in
        self.imageView.image = result
    })
}

Answer 1

在您的 ViewPhotoController.swift 中创建 var imageFromWebController: UIImage?

然后从 WebController.swift 传递你的图像 像下面的代码

if segue.identifier == "viewLargePhoto" {
        var viewPhotoController = segue.destination as! ViewPhotoController
        //Line beneath is the trouble causer
        viewPhotoController.imageFromWebController = sendImage
    }

将该图像分配给 ViewPhotoController 中的 imageView

override func viewDidLoad() {
        super.viewDidLoad()
        imageView.image = imageFromWebController
    }