ios - 以编程方式在 Xcode Playgrounds 中创建 UIView 子类
<p><h2>Xcode Playgrounds 中的 UIViewController 和 UIView 类</h2>
<p>我试图弄清楚如何在 Xcode Playgrounds 中创建 UIViewController 并将 UIView 子类附加到它。
我对 swift 和编码很陌生，所以遇到了一些麻烦。</p>
<pre><code>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)
}
}
</code></pre>
<p>这是我创建的 UIView 子类，看起来像这样...
<a href="/image/7kIVc.png" rel="noreferrer noopener nofollow">UIView</a> </p>
<p>然后我创建了我的主 UIViewController 类以将其添加到...</p>
<pre><code>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()
</code></pre>
<p>但是，当我将 UIView 子类添加到 UIViewController 时，它看起来像这样... <a href="/image/kjl0K.png" rel="noreferrer noopener nofollow">UIViewController</a> </p>
<p>这是一个不同的大小，改变我的 UIView 框架大小没有任何作用。</p>
<p>希望有人帮助理解它为什么会这样，谢谢。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您需要设置 ViewController 的<code>.preferredContentSize</code>。您可以显式执行此操作，也可以覆盖它:</p>
<pre><code>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()
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 以编程方式在 Xcode Playgrounds 中创建 UIView 子类，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/49263442/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/49263442/
</a>
</p>
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