ios 如何以编程方式创建 UIImage 视图 - Swift

How do you create a UIImage View Programmatically - Swift

提问by alex

I'm trying to create a UIImage View programmatically, I have a new view and I tried doing this

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))

this did not work because I don't know what this should be yourviewin the second line.

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。

Question:How do I make a UIImageView appear on the screen by coding it instead of doing it in the storyboard

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

回答by Nate Cook

First you create a UIImagefrom your image file, then create a UIImageViewfrom that:

首先UIImage从您的图像文件创建一个，然后UIImageView从该文件创建一个：

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

Finally you'll need to give imageViewa frame and add it your view for it to be visible:

最后，您需要提供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)

回答by Shanmugasundharam

First create UIImageView then add image in UIImageView .

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)

回答by MEnnabah

This answer is update to Swift 3.

这个答案是对 Swift 3 的更新。

This is how you can add an image view programmatically where you can control the constraints.

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
    }

}

回答by Vikram Pote

You can use above in one line.

您可以在一行中使用上面的内容。

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

回答by Sandeep Singh

In Swift 3.0 :

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)

回答by Fullpower

Thanks, MEnnabah, just to add to your code where you are missing the =sign in the declaration statement:

谢谢，Mennabah，只是为了添加到您的代码中您缺少=声明语句中的符号：

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
}()

Everything else is, all perfect for Swift 3.

其他一切都非常适合 Swift 3。

回答by iOS

In Swift 4.2 and Xcode 10.1

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
    }
}

回答by Joel

Swift 4:

斯威夫特 4：

First create an outlet for your UIImageView

首先为您的 UIImageView 创建一个插座

@IBOutlet var infoImage: UIImageView!

Then use the image property in UIImageView

然后使用 UIImageView 中的 image 属性

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