Swift ☞ UITableView（一）-优快云博客

本文链接：https://blog.youkuaiyun.com/magicZYJ/article/details/51742687

本文介绍如何在Swift2.0中使用UITableView实现带有头部和尾部视图的列表展示，并通过懒加载提高程序效率。

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测试程序：
基于swift2.0

import UIKit

class ViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {
    var tableView : UITableView!
    var isOpen    : Bool! = true;
    //懒加载
    lazy var dataArr :NSMutableArray = {
        var temDataArr = NSMutableArray();
        for i in 0...10 {

            temDataArr.addObject("\(i)");
        }
        return temDataArr;
    }();

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI();
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func setupUI(){

        tableView = UITableView(frame:CGRect(x: 0, y: 64, width: UIScreen.mainScreen().bounds.size.width, height: UIScreen.mainScreen().bounds.size.height - 64), style:.Plain);
        tableView.delegate = self;
        tableView.dataSource = self;

        //创建表头视图
        let tableHeaderView : UILabel! = UILabel(frame: CGRectMake(0,0,UIScreen.mainScreen().bounds.size.width,50));
        tableHeaderView.textAlignment = NSTextAlignment.Center;
        tableHeaderView.backgroundColor = UIColor.redColor();
        tableHeaderView.text = "我是表头视图";
        tableHeaderView.font = UIFont.boldSystemFontOfSize(14.0);
        self.tableView.tableHeaderView = tableHeaderView;
        //创建脚视图
        let tableFooterView = UIView(frame: CGRectMake(0,0,UIScreen.mainScreen().bounds.size.width,50));
        let footerLabel = UILabel(frame: tableFooterView.bounds);
        footerLabel.text = "我是脚视图";
        footerLabel.textAlignment = NSTextAlignment.Center;
        tableFooterView.backgroundColor = UIColor.yellowColor();
        tableFooterView.addSubview(footerLabel);
        tableView.tableFooterView = tableFooterView;

        view.addSubview(self.tableView);
    }

    //MARK: - UITableView DataSource && UITableView Delegate
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isOpen == true{
            return dataArr.count
        }else {
            return 0;
        }
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let mycell = "mycell";
        var cell = tableView.dequeueReusableCellWithIdentifier(mycell);
        if cell == nil {
        cell = CustomCell(style: .Default, reuseIdentifier: mycell);
        }
        return cell!;
    }

    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return 49;
    }

    func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {

        let custom = cell as! CustomCell;
        //三目运算符
        custom.titleLbel.text = dataArr[indexPath.row].integerValue > 5 ? String(dataArr[indexPath.row]) : String("10");
    }

    func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 50;
    }

    func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {

        return creatHeaderView();
    }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    }

    //MARK: -
    func creatHeaderView() -> UIView{

        let headerSectionView = UIView(frame: CGRectZero);
        headerSectionView.backgroundColor = UIColor.greenColor();
        let headerLabel = UILabel(frame: CGRectMake(0,0,UIScreen.mainScreen().bounds.size.width,20));
        headerLabel.backgroundColor = UIColor.purpleColor();
        headerLabel.text = "我是组头视图上的标签";
        headerLabel.textAlignment = NSTextAlignment.Center;
        headerSectionView.addSubview(headerLabel);

        let tapGesture = UITapGestureRecognizer(target: self, action: "tapAction:");
        headerLabel.userInteractionEnabled = true;
        headerLabel.addGestureRecognizer(tapGesture);
        return headerSectionView;
    }

    //MARK: - Handle GestureEvent 
    func tapAction(tap:UITapGestureRecognizer) {
        isOpen = !self.isOpen;
        tableView.reloadData();
    }
}

这里写图片描述

针对上面用到的语法，总结如下：

\()的用法
相当于OC中的 NSString stringWithFormat：@“%d”
但是使用起来更加自如

for i in 0...10 {

}
相当于OC中
for (int i = 0; i <= 10; i++) {

}

for i in 0..<10 {

}
相当于OC中
for (int i = 0; i < 10; i++) {

}

尽量避免使用self