Question

因此，经过研究，研究和外包，我无法解决我的问题:(。我目前正在尝试习惯于在传递价值时观察视图。那么最好开发一个简单的应用程序吗？

我的应用程序是这样的......第一页有一个图像数组，当视图加载时随机吐出一个图像，一个动作但是使用segue preform函数触发视图segue到下一个视图。

第二页包含一个关闭按钮和一个应该更改的图像视图，这取决于来自普通视图图像阵列的随机传递的图像。

除了我看不到随机传递的图像外，一切正常。

以下是我的代码：

第1页

import UIKit

class MainWelcomVC: UIViewController {



var ImageArr = [UIImageView]()

@IBOutlet weak var BackGround: UIImageView!



override func viewDidLoad() {
    super.viewDidLoad()

    for x in 0...2 {

        let image = UIImage(named: "char\(x).png")
        let imageview = (UIImageView(image: image))
        ImageArr.append(imageview)

    }


}

@IBAction func PlayButtonPressed(_ sender: Any) {

    let randomIndex = Int(arc4random_uniform(UInt32(ImageArr.count)))
    let CharImage = ImageArr[randomIndex]

    performSegue(withIdentifier: "CharDisplayVC", sender: CharImage)

}



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

    if let destination = segue.destination as? CharDisplayVC{

        if let ImageFinal = sender as? UIImage {
            destination.ImageToDisplay = ImageFinal
        }
}


}
}

第2页

import UIKit

class CharDisplayVC: UIViewController {

private var _ImageToDisplay: UIImage!

var ImageToDisplay: UIImage {

    get {

        return _ImageToDisplay

    } set {

        _ImageToDisplay = newValue
    }

}


@IBOutlet weak var CharPicture: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

    CharPicture.image = _ImageToDisplay


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func PlayAgainBtnPressed(_ sender: Any) {

    dismiss(animated: true, completion: nil)
}



}

Answer 1

这不是我在segues中使用sender参数的方式。通常我会调用self，因为UIViewController正在进行performSegue调用。以下内容应该有效。

import UIKit

class MainWelcomVC: UIViewController {

    var ImageArr = [UIImageView]()
    var CharImage: UIImage?

    @IBOutlet weak var BackGround: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        for x in 0...2 {

            let image = UIImage(named: "char\(x).png")
            let imageview = (UIImageView(image: image))
            ImageArr.append(imageview)
        }
    }

    @IBAction func PlayButtonPressed(_ sender: Any) {

        let randomIndex = Int(arc4random_uniform(UInt32(ImageArr.count)))
        self.CharImage = ImageArr[randomIndex].image

        performSegue(withIdentifier: "CharDisplayVC", sender: self)
    }



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

        if let destination = segue.destination as? CharDisplayVC {

            if let ImageFinal = self.CharImage as? UIImage {
                destination.ImageToDisplay = ImageFinal
            }
        }
    }
}

Answer 2

所以终于找到了一个解决方案，并且让所有内容成为包含数组的UIimage对象，下面是第1页的新代码：

import UIKit

class MainWelcomVC: UIViewController {

var ImageArr = [UIImage]()
var CharImage: UIImage?

@IBOutlet weak var BackGround: UIImageView!


override func viewDidLoad() {
    super.viewDidLoad()

    for x in 0...2 {

        let image = UIImage(named: "char\(x).png")
        ImageArr.append(image!)
    }
}




@IBAction func PlayButtonPressed(_ sender: Any) {

    let randomIndex = Int(arc4random_uniform(UInt32(ImageArr.count)))
    self.CharImage = ImageArr[randomIndex]

    performSegue(withIdentifier: "CharDisplayVC", sender: self)
}



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

   if let destination = segue.destination as? CharDisplayVC {

        if let ImageFinal = self.CharImage as? UIImage! {
            destination.ImageToDisplay = ImageFinal
        }
   }
  }
 }

我仍然有一个黄色警告，上面写着“来自'UIImage'的有条件演员？” 'UIImage！'总是成功“和另一个说”模式匹配从'UIImage'引入隐含的促销！以下代码中的'UIImage！？'“：

  if let ImageFinal = self.CharImage as? UIImage! {

  }

传递图像并显示它

2 个答案: