Swift - 生成各种控件的工厂类（包含标签，按钮，输入框等）

在iOS开发中，页面里有时会大量的用到一些控件，如果要一个个单独创建再设置样式的话就显得很麻烦。我们可以创建一个生成各种控件的工厂类，这样在需要的时候调用下就可以了。

import UIKit

class ViewFactory
{
    /**
     * 控件默认尺寸
     */
    class func getDefaultFrame() -> CGRect
    {
        let defaultFrame = CGRectMake(0, 0, 100, 30)
        return defaultFrame
    }
    
    class func createControl(type:String, title:[String], action:Selector, sender:AnyObject)
        -> UIView {
        switch(type)
        {
        case "label":
            return ViewFactory.createLabel(title[0])
        case "button":
            return ViewFactory.createButton(title[0], action: action,
                sender: sender as! UIViewController)
        case "text":
            return ViewFactory.createTextField(title[0], action: action,
                sender: sender as! UITextFieldDelegate)
        case "segment":
            return ViewFactory.createSegment(title, action: action, sender:
                sender as! UIViewController)
        default:
            return ViewFactory.createLabel(title[0])
        }
    }
    
    /**
     * 创建按钮控件
     */
    class func createButton(title:String, action:Selector, sender:UIViewController)
        -> UIButton {
        let button = UIButton(frame:ViewFactory.getDefaultFrame())
        button.backgroundColor = UIColor.orangeColor()
        button.setTitle(title, forState:.Normal)
        button.titleLabel!.textColor = UIColor.whiteColor()
        button.titleLabel!.font = UIFont.systemFontOfSize(14)
        button.addTarget(sender, action:action, forControlEvents:.TouchUpInside)
        return button
    }
    
    /**
     * 创建文本输入框控件
     */
    class func createTextField(value:String, action:Selector, sender:UITextFieldDelegate)
        -> UITextField
    {
        let textField = UITextField(frame:ViewFactory.getDefaultFrame())
        textField.backgroundColor = UIColor.clearColor()
        textField.textColor = UIColor.blackColor()
        textField.text = value
        textField.borderStyle = UITextBorderStyle.RoundedRect
        textField.adjustsFontSizeToFitWidth = true
        textField.delegate = sender
        return textField
    }
    
    /**
     * 创建分段单选控件
     */
    class func createSegment(items: [String], action:Selector, sender:UIViewController)
        ->UISegmentedControl
    {
        let segment = UISegmentedControl(items:items)
        segment.frame = ViewFactory.getDefaultFrame()
        //segment.segmentedControlStyle = UISegmentedControlStyle.Bordered
        segment.momentary = false
        segment.addTarget(sender, action:action, forControlEvents:.ValueChanged)
        return segment
    }
    
    /**
     * 创建文本标签控件
     */
    class func createLabel(title:String) -> UILabel
    {
        let label = UILabel()
        label.textColor = UIColor.blackColor();
        label.backgroundColor = UIColor.whiteColor();
        label.text = title;
        label.frame = ViewFactory.getDefaultFrame()
        label.font =  UIFont(name: "HelveticaNeue-Bold", size: 16)
        return label
    }
}

工厂类的使用：

import UIKit

class ViewController: UIViewController,UITextFieldDelegate {
    
    var txtNum:UITextField!
    var segDimension:UISegmentedControl!
    var btn:UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupControls()
    }
    
    func setupControls()
    {
        //创建文本标签
        let labelNum = ViewFactory.createLabel("阈值:")
        labelNum.frame = CGRect(x: 20, y: 100, width: 60, height: 30)
        self.view.addSubview(labelNum)
        
        let labelDm = ViewFactory.createLabel("维度:")
        labelDm.frame = CGRect(x: 20, y: 200, width: 60, height: 30)
        self.view.addSubview(labelDm)
        
        //创建文本输入框
        txtNum = ViewFactory.createTextField("", action: nil, sender:self)
        txtNum.frame = CGRect(x:80,y:100,width:200,height:30)
        txtNum.returnKeyType = UIReturnKeyType.Done
        self.view.addSubview(txtNum)
        
        //创建分段单选控件
        segDimension = ViewFactory.createSegment(["3x3", "4x4", "5x5"],
            action:"dimensionChanged:", sender:self)
        segDimension.frame = CGRect(x:80,y: 200,width: 200,height: 30)
        self.view.addSubview(segDimension)
        segDimension.selectedSegmentIndex = 1
        
        //创建按钮控件
        btn = ViewFactory.createButton("确定", action: nil, sender: self)
        btn.frame.origin = CGPointMake(80, 300)
        self.view.addSubview(btn)
    }
    
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        //收起键盘
        txtNum.resignFirstResponder()
        //打印出文本框中的值
        print(txtNum.text)
        return true
    }
    
    func dimensionChanged(sender:AnyObject) {
        print("dimensionChanged")
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}