[纯代码]Swift 2.0 开发新浪微博--第一天

开发环境:Xcode 7  Beta 4

1.1: 部署初步架构

1.2 设置根控制器(AppDelegate.swift)

<span style="font-family:Microsoft YaHei;">   func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.

        window = UIWindow (frame: UIScreen.mainScreen().bounds )
        window?.backgroundColor = UIColor.whiteColor()
        window?.rootViewController = MainUITabBarController()
        window?.makeKeyAndVisible()
        return true
    }
</span>

1.3 自定义TarbBar

<span style="font-family:Microsoft YaHei;">import UIKit

class MainUITabBarController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        addChildViewControllers()
        setComposeButton()
    }

   ///设置Button
    private func setComposeButton() {

        //计算Button 高度
        let w = tabBar.bounds.width / CGFloat (viewControllers!.count)

        // Button 已有宽和高的Rect
        let rect = CGRect(x: 0, y: 0, width: w, height: tabBar.bounds.height)

        //使用偏移 设置Button位置
        composeButton.frame = CGRectOffset(rect, 2 * w, 0)

    }

     /// 添加所有子控制器
    private  func addChildViewControllers() {

        //Start添加所有子控制器--------------------------
        addChildViewController(HomeTableViewController(), title:"首页",imageName:"tabbar_home" )

        addChildViewController(MessageTableViewController(), title:"消息",imageName:"tabbar_message_center" )

        addChildViewController(UIViewController())

        addChildViewController(DiscoverTableViewController(), title:"发现",imageName:"tabbar_discover" )

        addChildViewController(profileTableViewController(), title:"我",imageName:"tabbar_profile" )
        //end-----------------------------------------
    }

    ///懒加载创建Button
    lazy private var composeButton: UIButton = {

        let button = UIButton ()

        //Start设置Button素材---------------------------------
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)

        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)

        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal )

        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted )
        //end-----------------------------------------------

        //此处不提示得手敲
        self.tabBar.addSubview(button)

        button.addTarget(self, action: "ClickComposeButton", forControlEvents: UIControlEvents.TouchUpInside)

        return button

    }()

    /// 添加控制器方法
    ///
    /// - parameter vc       : 视图控制器
    /// - parameter title    : 标题
    /// - parameter imageName: 图像名称
    private func addChildViewController(vc:UIViewController, title: String, imageName: String) {
        tabBar.tintColor = UIColor.orangeColor()
        vc.title = title
        vc.tabBarItem.image = UIImage(named: imageName)
        let nav = UINavigationController(rootViewController: vc)
        addChildViewController(nav)

    }
    </span>

1.4 通过继承关系设置登录界面

注: 根据用户是否登录来判断界面是否切换

1.4.1自定义一个继承UITableViewController的控制器

1.4.2 修改所有控制器的继承关系,继承BaseTableViewController

1.4.3 设置BaseTableViewController的View

<span style="font-family:Microsoft YaHei;">    ///设置自定义登录View
    private func setVistorView() {

        //创建空View,测试使用
        view = UIView ()
        //设置颜色
        view.backgroundColor = UIColor.orangeColor()

    }</span>

1.4.4 重写BaseTableViewController 的loadView()方法

<span style="font-family:Microsoft YaHei;">//定义一个用户是否登录的开关
    var userLogin = true</span>

<span style="font-family:Microsoft YaHei;">    override func loadView() {
        //判断用户登录是否成功切换View
        userLogin ? super.loadView() : setVistorView()

    }</span>

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