如何以编程方式创建 UIImage 视图 - Swift

Question

我正在尝试以编程方式创建 UIImage 视图，我有一个新视图，我尝试这样做

let imageName = "yourImage.png"
yourview.backgroundColor = UIColor.colorWithPatternImage(UIImage(named:imageName))

这不起作用，因为我不知道你在第二行中的观点应该是什么。

问题：如何通过编码而不是在情节提要中使 UIImageView 出现在屏幕上

Answer 1

首先从图像文件创建一个UIImage ，然后从中创建一个UIImageView ：

let imageName = "yourImage.png"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)

最后，您需要为imageView一个框架并将其添加到您的视图中以使其可见：

imageView.frame = CGRect(x: 0, y: 0, width: 100, height: 200)
view.addSubview(imageView)

Answer 2

首先创建 UIImageView 然后在 UIImageView 中添加图像。

    var imageView : UIImageView
    imageView  = UIImageView(frame:CGRectMake(10, 50, 100, 300));
    imageView.image = UIImage(named:"image.jpg")
    self.view.addSubview(imageView)

Answer 3

这个答案是对 Swift 3 的更新。

这是您可以通过编程方式添加图像视图的方式，您可以在其中控制约束。

Class ViewController: UIViewController {

    let someImageView: UIImageView = {
       let theImageView = UIImageView()
       theImageView.image = UIImage(named: "yourImage.png")
       theImageView.translatesAutoresizingMaskIntoConstraints = false //You need to call this property so the image is added to your view
       return theImageView
    }()

    override func viewDidLoad() {
       super.viewDidLoad()

       view.addSubview(someImageView) //This add it the view controller without constraints
       someImageViewConstraints() //This function is outside the viewDidLoad function that controls the constraints
    }

    // do not forget the `.isActive = true` after every constraint
    func someImageViewConstraints() {
        someImageView.widthAnchor.constraint(equalToConstant: 180).isActive = true
        someImageView.heightAnchor.constraint(equalToConstant: 180).isActive = true
        someImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        someImageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 28).isActive = true
    }

}

Answer 4

您可以在一行中使用上面的内容。

  let imageView = UIImageView(image: UIImage(named: "yourImage.png")!)

Answer 5

在 Swift 3.0 中：

var imageView : UIImageView
    imageView  = UIImageView(frame:CGRect(x:10, y:50, width:100, height:300));
    imageView.image = UIImage(named:"Test.jpeg")
    self.view.addSubview(imageView)

Answer 6

谢谢，Mennabah，只是添加到您的代码中，您在声明语句中缺少=符号：

let someImageView: UIImageView = {
   let theImageView = UIImageView()
   theImageView.image = UIImage(named: "yourImage.png")
   theImageView.translatesAutoresizingMaskIntoConstraints = false //You need to call this property so the image is added to your view
   return theImageView
}()

其他一切都非常适合 Swift 3。

Answer 7

在 Swift 4.2 和 Xcode 10.1 中

//Create image view simply like this.
let imgView = UIImageView()
imgView.frame = CGRect(x: 200, y: 200, width: 200, height: 200)
imgView.image = UIImage(named: "yourimagename")//Assign image to ImageView
imgView.imgViewCorners()
view.addSubview(imgView)//Add image to our view

//Add image view properties like this(This is one of the way to add properties).  
extension UIImageView {
    //If you want only round corners
    func imgViewCorners() {
        layer.cornerRadius = 10
        layer.borderWidth = 1.0
        layer.masksToBounds = true
    }
}

Answer 8

确保放置：

imageView.translatesAutoresizingMaskIntoConstraints = false

如果你不放，你的图像视图将不会显示，不要问我为什么。

Answer 9

斯威夫特 4：

首先为您的 UIImageView 创建一个插座

@IBOutlet var infoImage: UIImageView!

然后使用 UIImageView 中的 image 属性

infoImage.image = UIImage(named: "icons8-info-white")