swiftt之表格控件（UITableView）详解，出错，求指南

Love The Way You Lie 2022-08-20 14:26 183阅读 0赞

1、问题描述

最后的界面上什么都没有，空白的。如下图：

![Center][]

2、敢问：问题出在什么地方？

3、代码如下：

import UIKit
    
    enum UIControlType
    {
        case Basic;
        case Advanced;
    }
    
    class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
        
        
        var tableView:UITableView?;
        var ctrNames:[String] = ["按钮UIButton", "标签UILabel", "文本框UITextField"];
        var allNames:Dictionary<Int,[String]>?;
        var adHeader:[String]?;
        var controlType:UIControlType?;
        
        override func loadView()
        {
            super.loadView();
        }
        
    
        override func viewDidLoad() {
            super.viewDidLoad()
            
            /// 初始化数据，把这次数据放在属性列表文件里
            allNames = [0:ctrNames, 1:[String]([
                "UIDatePicker 日期选择器",
                "UIWebView 网页选择器",
                "UIToolBar 工具条"])];
            
            
            self.adHeader = ["常见 UIkit 控件", "高级UIKIt控件"];
        }
        
        
        @IBAction func plainClicked(sender:UIBarButtonItem)
        {
            controlType = UIControlType.Basic;
            
            /// 创建表视图
            self.tableView = UITableView(frame: CGRectMake(0, 100, view.frame.size
                .width, view.frame.size.height - 100), style: UITableViewStyle.Plain);
            self.tableView!.delegate = self;
            self.tableView!.dataSource = self;
            
            /// 创建单元格
            self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "SwiftCell");
            self.view.addSubview(self.tableView!);
            
            /// 创建标签头
            let headerLabel = UILabel(frame: CGRectMake(0, 0, view.bounds.size
                .width, 30));
            headerLabel.backgroundColor = UIColor.blackColor();
            headerLabel.textColor = UIColor.whiteColor();
            headerLabel.numberOfLines = 0;
            headerLabel.lineBreakMode = NSLineBreakMode.ByCharWrapping;
            headerLabel.text = "常见UIKit控件";
            headerLabel.font = UIFont.italicSystemFontOfSize(20);
            
            /// 将label显示到TableView中
            self.tableView!.tableHeaderView = headerLabel;
        }
        
        @IBAction func groupClickd(sender:UIBarButtonItem)
        {
            controlType = UIControlType.Advanced;
            
            /// 创建视图
            self.tableView = UITableView(frame: CGRectMake(0, 100, view.frame.size.width, view.frame.size
                .height - 100), style: UITableViewStyle.Grouped);
            
            self.tableView!.delegate = self;
            self.tableView!.dataSource = self;
            
            
            /// 创建单元格
            self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "SwiftCell");
            
            self.view.addSubview(self.tableView!);
            
            
            /// 创建标签头
            let headerLabel = UILabel(frame: CGRectMake(0, 0, view.bounds.size
                .width, 30));
            headerLabel.backgroundColor = UIColor.blackColor();
            headerLabel.textColor = UIColor.whiteColor();
            headerLabel.numberOfLines = 0;
            headerLabel.lineBreakMode = NSLineBreakMode.ByCharWrapping;
            headerLabel.text = "高级UIKit控件";
            headerLabel.font = UIFont.italicSystemFontOfSize(20);
            
            self.tableView!.tableHeaderView = headerLabel;
        }
        
        /// 创建分区
        func numberOfSectionsInTableView(table:UITableView)->Int
        {
            return controlType == UIControlType.Basic ? 1:2;
        }
        /// 返回行数
        func tableView(tableView:UITableView, numberOfRowsInSection section:Int)->Int
        {
            let data = allNames![section];
            return data!.count;
        }
    
        /// 协议中得方法，该方法的返回值决定指定分区的头部
        func tableView(table:UITableView, titleForHeaderInSection section:Int)->String?
        {
            return adHeader?[section];
        }
        /// 协议中的方法，该方法的返回值决定指定分区的尾部
        func tableView(table:UITableView, titleForFooterInSection section:Int)->String?
        {
            return "有\(allNames![section]!.count)个控件";
        }
        
        func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
            
            let identify = "SwiftCell";
            
            let cell = tableView.dequeueReusableCellWithIdentifier(identify, forIndexPath: indexPath);
            cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator;
            let secno = indexPath.section;
            let data = allNames![secno];
            cell.textLabel?.text = data![indexPath.row];
            
            return cell;
        }
        
        /// UItableViewDelegate 方法，处理列表项的选中事件
        func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
        {
            
            tableView.deselectRowAtIndexPath(indexPath, animated: true);
            let itemString = ctrNames[indexPath.row];
            
            /// 创建提示框
            let alertView = UIAlertController(title: "提示", message: "你选中了\(itemString)", preferredStyle: .Alert);
            /// 向提示框中增加按钮
            let alertAction = UIAlertAction(title: "确定", style: UIAlertActionStyle.Default, handler: {(action)->Void in});
            alertView.addAction(alertAction);
            
            presentViewController(alertView, animated:true, completion:nil);
        }
        
        
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
    
    }

4、UITableView控件详解

![Center 1][]

![Center 2][]

[Center]: /images/20220731/90a077741b634b70bce90e0c303f7c59.png
[Center 1]: /images/20220731/18e8cb0f86b045db8b809dc8a3eaef10.png
[Center 2]: /images/20220731/b62085629d994ab7928b10d8b62a934a.png