swift - 将图像从collectionview传递到VC

Question

尝试了很多方法都无法实现

ViewController 1 有:Collectionview > Cell > 单元格内的图像

ViewController 2想要显示VC 1中的图像

当您单击单元格时，它会自动将您推至 VC 2

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if segue.identifier == "popup" {

        let viewController: friendpopup = segue.destination as! friendpopup
        let indexPath = sender as! NSIndexPath
        let nicknamex = self.nicknameArray[indexPath.row]
        let usernamex = self.userArray[indexPath.row]
        let photox = self.friendsphotos[indexPath.row] // the photos PFFiles i think


        viewController.snick = nicknamex
        viewController.suser = usernamex
        viewController.sphoto = // ????
}

昵称和用户工作正常，只是图像无法显示。

我尝试过，当您单击单元格时，它会将图像发送到 var，但不起作用

var photovar:UIImage!

didSelectItemAt( self.photovar = cell.profilepic.image)然后在prepareSegue(viewcontroller.sphoto = self.photovar)

没有醒来，任何人都可以帮我解决这个问题以显示图像吗？谢谢

Answer 1

稍微收紧你的代码......

第一个风险投资

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "popup" {
        if let vc = segue.destination as? friendpopup {
            let indexPath = sender as! NSIndexPath
            vc.snick = self.nicknameArray[indexPath.row]
            vc.suser = self.userArray[indexPath.row]
            vc.sphoto = self.friendsphotos[indexPath.row]
        }
    }
}

第二个风险投资:

// making assumptions on variable types
var snick:String!
var suser:String!
var sphoto:UIImage!

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // do work here
    if sphoto != nil {
        imageView.image = sPhoto
    } else {
        // set a default image here
    }
}

其中大部分内容与您的代码类似，但最后要注意 - 如果前 2 个属性正确，请检查您正在正确提取图像的第一个 VC。