如何以编程方式快速创建具有控件文本字段，按钮等的自定义视图

问题描述

我正在尝试使用ViewController.swift中的以下代码从另一个类访问MyCustomView.

I am trying to access the MyCustomView from another class using the following code in ViewController.swift ..

var view = MyCustomView(frame: CGRectZero)

..在viewDidLoad方法中.问题是视图未在模拟器中初始化.

.. in the viewDidLoad method. The problem is the view does not get initialized in the simulator.

我已经在当前的ViewController的情节提要中设置了类.

I have already set class in storyboard for the current ViewController.

class MyCustomView: UIView {
    var label: UILabel = UILabel()
    var myNames = ["dipen","laxu","anis","aakash","santosh","raaa","ggdds","house"]

    override init(){
        super.init()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.addCustomView()
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func addCustomView() {
        label.frame = CGRectMake(50, 10, 200, 100)
        label.backgroundColor=UIColor.whiteColor()
        label.textAlignment = NSTextAlignment.Center
        label.text = "test label"
        label.hidden=true
        self.addSubview(label)

        var btn: UIButton = UIButton()
        btn.frame=CGRectMake(50, 120, 200, 100)
        btn.backgroundColor=UIColor.redColor()
        btn.setTitle("button", forState: UIControlState.Normal)
        btn.addTarget(self, action: "changeLabel", forControlEvents: UIControlEvents.TouchUpInside)
        self.addSubview(btn)

        var txtField : UITextField = UITextField()
        txtField.frame = CGRectMake(50, 250, 100,50)
        txtField.backgroundColor = UIColor.grayColor()
        self.addSubview(txtField)
    }

推荐答案

CGRectZero常数等于位置(0,0)处的矩形，宽度和高度均为零.如果使用AutoLayout，这很好用，实际上是首选，因为AutoLayout可以正确放置视图.

The CGRectZero constant is equal to a rectangle at position (0,0) with zero width and height. This is fine to use, and actually preferred, if you use AutoLayout, since AutoLayout will then properly place the view.

但是，我希望您不使用自动版式.因此，最简单的解决方案是通过显式提供框架来指定自定义视图的大小:

But, I expect you do not use AutoLayout. So the most simple solution is to specify the size of the custom view by providing a frame explicitly:

customView = MyCustomView(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
self.view.addSubview(customView)

请注意，您还需要使用addSubview，否则您的视图不会添加到视图层次结构中.

Note that you also need to use addSubview otherwise your view is not added to the view hierarchy.

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