Question

Xcode Playgrounds中的UIViewController和UIView类

我试图找出如何在Xcode Playgrounds中创建UIViewController并将UIView子类附加到它。我对快速编码很新，所以遇到了一些麻烦。

class myView : UIView {

var label : UIButton!
var topHeader : UIImageView!
var nameText : UITextField!
var password : UITextField!

override init(frame: CGRect) {
    super.init(frame: CGRect(x: 10, y: 10, width: 350, height: 450))
    self.backgroundColor = UIColor.white
    self.layer.borderColor = UIColor.black.cgColor
    self.layer.borderWidth = 0.5

//place matters what gets loaded in first.
    header("")
    loginButton()
    nameyText()
    nameyText2()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

convenience init() {
    self.init(frame: CGRect.zero)
}

func header(_ imageInsert: String){

    let topHeader = UIImageView()
    topHeader.frame = CGRect(x: -1, y: -1, width: 400, height: 125)
    topHeader.backgroundColor = UIColor.white
    topHeader.layer.borderWidth = 0.5
    topHeader.translatesAutoresizingMaskIntoConstraints  = true
    topHeader.image = UIImage(named: imageInsert)


    self.addSubview(topHeader)
}

func loginButton (){
    //create properties for button

    let label = UIButton(type: UIButtonType.roundedRect)
    label.backgroundColor = .white
    label.frame = CGRect(x: 135, y: 315, width: 75, height: 30)
    label.setTitle("Login", for: UIControlState.normal)
    label.layer.borderWidth = 0.5
    label.layer.borderColor = UIColor.blue.cgColor
    label.layer.cornerRadius = 4

    self.addSubview(label)
}


func nameyText () {

    let nameText = UITextField()
    nameText.frame = CGRect(x: 45, y: 200, width: 250, height: 30)
    nameText.backgroundColor = .white
    nameText.borderStyle = .roundedRect
    nameText.layer.borderColor = UIColor.lightGray.cgColor
    nameText.placeholder = "Username"
    nameText.keyboardAppearance = .default

    self.addSubview(nameText)
}

func nameyText2 () {

    let password = UITextField()
    password.frame = CGRect(x: 45, y: 255, width: 250, height: 30)
    password.backgroundColor = .white
    password.borderStyle = .roundedRect
    password.layer.borderColor = UIColor.lightGray.cgColor
    password.placeholder = "Password"
    password.keyboardAppearance = .default
    password.isSecureTextEntry = true

    self.addSubview(password)
}

}

这是我创建的UIView子类，看起来像这样...... UIView

然后我创建了我的主要UIViewController类，将其添加到...

import UIKit
import PlaygroundSupport

public class ViewController : UIViewController, UITextFieldDelegate {

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

public override func loadView() {
    //trying to make myView the root view for This ViewController
    self.view = myView()
}
}
PlaygroundPage.current.liveView = ViewController()

但是，当我将UIView子类添加到UIViewController时，它看起来像这样...... UIViewController

这是一个不同的大小，改变我的UIView框架大小什么都不做。

希望有人帮助理解为什么会这样做，谢谢。

Answer 1

您需要设置视图控制器的.preferredContentSize。您可以明确地或通过覆盖它来执行此操作：

public class ViewController : UIViewController, UITextFieldDelegate {

    override public var preferredContentSize: CGSize {
        get { return self.view.bounds.size }
        set { super.preferredContentSize = newValue }
    }

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

    public override func loadView() {
        //trying to make myView the root view for This ViewController
        self.view = myView()
    }
}

以编程方式在Xcode Playgrounds中创建UIView子类

Xcode Playgrounds中的UIViewController和UIView类

1 个答案: