Question

我正在尝试根据我正在显示的应用程序的哪个部分更改UIImageView。

在我的视图控制器中，这可用于设置图像：

let screenSize = UIScreen.main.bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height

let imageName = "sectionOneBackground"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)
imageView.frame = CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight)
view.addSubview(imageView)

但是，如果我将图像包装成if if：

var imageName = ""

if (section == "one") {
    imageName = "sectionOneBackground"
}

if (section == "two") {
    imageName = "sectionTwoBackground"
}

if (section == "three") {
    imageName = "sectionThreeBackground"
}

然后它就不会出现在视图上。我完全错过了什么。有没有更简单的方法来更改视图的背景？

提前致谢。

Answer 1

将Imageview创建为全局

的字符串名称

class ViewController: UIViewController
{
 var imageView : UIImageView!
 var imageName : String!

}

在viewdidload上

创建imageview就像

一样

 override func viewDidLoad() {
    super.viewDidLoad()

    let screenSize = UIScreen.main.bounds
    let screenWidth = screenSize.width
    let screenHeight = screenSize.height

    imageName = "sectionOneBackground"
    imageView = UIImageView(image: UIImage(named: imageName)!)
    imageView.frame = CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight)
    view.addSubview(imageView)

}

<强>最后

每当您将imageview名称更改为

时

if (section == "one") {
imageName = "sectionOneBackground"
}

else if (section == "two") {
imageName = "sectionTwoBackground"
}

else if (section == "three") {
imageName = "sectionThreeBackground"
}
 imageView.image = UIImage(named: imageName)

将最终图片名称设置为图片视图

  imageView.image = UIImage(named: imageName)

Swift：根据IF更改UIImageView

1 个答案: