Question

目前，我正在通过以下操作更改图像视图：

@IBOutlet var bgImage: UIImageView!

在情节提要中创建连接的UIimage视图和

var counter = 0
    @IBAction func ChangePic(){

        //print(counter)
        if(counter == 15){
              counter = 0
        }

        let image: UIImage = UIImage(named: String(counter))!
        bgImage = UIImageView(image: image)
        bgImage.image = UIImage(named: String(counter))
        self.view.addSubview(bgImage!)
        counter = counter + 1

    }

在此处修改图像视图，此功能连接到情节提要中的按钮，因此单击该按钮可更改图像。出现计数器的原因是因为照片是从0到14枚举的，所以我可以轻松地显示它们。这样效果很好，但是图像会自动调整大小并不断出现在彼此之上

Answer 1

由于您已经拥有imageView bgImage，因此您要做的就是在bgImage上设置image属性。您不需要每次都创建一个新的imageView。

@IBAction func ChangePic(){

   if(counter == 15){
          counter = 0
    }
    bgImage.image = UIImage(named: String(counter))
    counter = counter + 1
}

Answer 2

如果您只想更改图像，则只需执行以下操作：

@IBAction func ChangePic(){

        //print(counter)
        if(counter == 15){
              counter = 0
        }

        bgImage.image = UIImage(named: String(counter))
        counter = counter + 1

    }

您当前的代码：

@IBAction func ChangePic(){

        //print(counter)
        if(counter == 15){
              counter = 0
        }

        // You create new image
        let image: UIImage = UIImage(named: String(counter))!

        // You set new instance to your imageView with your updated image (No need to do this because the object is not nil)
        bgImage = UIImageView(image: image)

        // You set again your updated image (only this line required )
        bgImage.image = UIImage(named: String(counter))

        // No needed
        self.view.addSubview(bgImage!)


        counter = counter + 1

    }

是否有更好的方法通过单击按钮来更改ImageView中的Image？

2 个答案: