Swift - 使用表格组件UITableView实现单列表

1，样例说明：

（1）列表内容从Controls.plist文件中读取，类型为Array。

（2）点击列表项会弹出消息框显示该项信息。

（3）按住列表项向左滑动，会出现删除按钮。点击删除即可删除该项。

2，效果图

3，单元格复用机制：

由于普通的表格视图中对的单元格形式一般都是相同的，所以本例采用了单元格复用机制，可以大大提高程序性能。

实现方式是初始化创建UITableView实例时使用registerClass(UITableViewCell.self,forCellReuseIdentifier: "SwiftCell")创建一个可供重用的UITableViewCell。并将其注册到UITableView，ID为SwiftCell。下次碰到形式（或结构）相同的单元就可以直接使用UITableView的dequeueReusableCellWithIdentifier方法从UITableView中取出。

4，示例代码

---ViewController.swift ---

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import UIKit class ViewController : UIViewController , UITableViewDelegate ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, UITableViewDataSource { var ctrlnames:[ String ]? tableView: UITableView ? override func loadView() { super .loadView() } viewDidLoad() { .viewDidLoad() //初始化数据，这一次数据，我们放在属性列表文件里 self .ctrlnames = NSArray (contentsOfFile: NSBundle .mainBundle().pathForResource( "Controls" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,ofType: "plist" )!) as ? Array print ( .ctrlnames) //创建表视图 .tableView = UITableView (frame: .view.frame,style: UITableViewStyle . Plain ) .tableView!.delegate = self .tableView!.dataSource = self //创建一个重用的单元格 .tableView!.registerClass( UITableViewCell . ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,forCellReuseIdentifier: "SwiftCell" ) .view.addSubview( .tableView!) //创建表头标签 let headerLabel = UILabel (frame: CGRectMake (0, .view.bounds.size.width,30)) headerLabel.backgroundColor = UIColor .blackColor() headerLabel.textColor = .whiteColor() headerLabel.numberOfLines = 0 headerLabel.lineBreakMode = NSLineBreakMode ByWordWrapping headerLabel.text = "常见 UIKit 控件" headerLabel.font = UIFont .italicSystemFontOfSize(20) .tableView!.tableHeaderView = headerLabel } //在本例中，只有一个分区 numberOfSectionsInTableView(tableView: ) -> Int { return 1; } //返回表格行数（也就是返回控件数） tableView(tableView: ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,numberOfRowsInSection section: { return .ctrlnames!.count } //创建各单元显示内容(创建参数indexPath指定的单元） tableView(tableView: ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,cellForRowAtIndexPath indexPath: NSIndexPath ) -> UITableViewCell { //为了提供表格显示性能，已创建完成的单元需重复使用 identify: = "SwiftCell" //同一形式的单元格重复使用，在声明时已注册 cell = tableView.dequeueReusableCellWithIdentifier(identify,forIndexPath: indexPath) as UITableViewCell cell.accessoryType = UITableViewCellAccessoryType disclosureIndicator cell.textLabel?.text = .ctrlnames![indexPath.row] cell } // UITableViewDelegate 方法，处理列表项的选中事件 ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:inherit!important; background:none rgb(249,didSelectRowAtIndexPath indexPath: ) { .tableView!.deselectRowAtIndexPath(indexPath,animated: true ) itemString = .ctrlnames![indexPath.row] alertController = UIAlertController (title: "提示!" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, message: "你选中了【\(itemString)】" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,preferredStyle: UIAlertControllerStyle Alert ) okAction = UIAlertAction "确定" UIAlertActionStyle Default ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,handler: nil ) alertController.addAction(okAction) .presentViewController(alertController,completion: ) } //滑动删除必须实现的方法 ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:inherit!important; background:none rgb(249, commitEditingStyle editingStyle: UITableViewCellEditingStyle ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, forRowAtIndexPath indexPath: ) { ( "删除\(indexPath.row)" ) index = indexPath.row .ctrlnames?.removeAtIndex(index) .tableView?.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation Top ) } //滑动删除 ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:inherit!important; background:none rgb(249,editingStyleForRowAtIndexPath indexPath: NSIndexPath ) { return UITableViewCellEditingStyle Delete } //修改删除按钮的文字 ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:inherit!important; background:none rgb(249, titleForDeleteConfirmationButtonForRowAtIndexPath indexPath: String ? { return "删" } didReceiveMemoryWarning() { .didReceiveMemoryWarning() } }

--- Controls.plist ---

16

<? xml version = "1.0" encoding "UTF-8" ?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> < plist "1.0" > array > string >标签 UILabel</ > >文本框 UITextField</ > >按钮 UIButton</ > >开关按钮 UISwitch</ > >分段控件 UISegmentControl</ > >图像 UIImageView</ > >进度条 UIProgressView</ > >滑动条 UiSlider</ > >警告框 UIAlertView</ > </ > plist >

NSArray是Objective-C里的数组类型。Array是Swift里的数组类型。
为了便于使用，这里把NSArray做了类型转换，转成Array。

as 关键字就是起到类型转换的作用。

NSArray是Objective-C原来就有的类型，Array是Swift新增的类型，Array新加许多方法，更便于操作，所以Swift中可以使用Array的尽量使用Array。var ctrlnames:Array? 可以简写成 var ctrlnames:[String]?

原文地址：https://www.jb51.cc/swift/324866.html