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。

下面以一个自定义的工厂类为例，其中提供了文本标签，按钮，文本输入框，分段单选控件的生成，效果图如下：

  

工厂类：ViewFactory.swift

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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     {         var 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:UIControlEvents.TouchUpInside)         return button     }           /**     * 创建文本输入框控件     */     class func createTextField(value:String, action:Selector, sender:UITextFieldDelegate)         -> UITextField     {         var 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     {         var segment = UISegmentedControl(items:items)         segment.frame = ViewFactory.getDefaultFrame()         //segment.segmentedControlStyle = UISegmentedControlStyle.Bordered         segment.momentary = false         segment.addTarget(sender, action:action, forControlEvents:UIControlEvents.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：

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import UIKit   class ViewController: UIViewController,UITextFieldDelegate {       var txtNum:UITextField!     var segDimension:UISegmentedControl!     var btn:UIButton!           override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.         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:Selector("numChanged"), 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)     }       override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()         // Dispose of any resources that can be recreated.     } }