Swift 学习点滴记载(一)

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Swift设置导航栏(navigationBar)背景颜色,标题颜色和字体大小,item颜色

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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.backgroundColor = UIColor.white
    let nav = UINavigationController(rootViewController: HomeVC())
    //设置导航栏背景颜色
    nav.navigationBar.barTintColor = UIColor.blue
    let dict:NSDictionary = [NSAttributedStringKey.foregroundColor: UIColor.white,NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)]
    //标题颜色
    nav.navigationBar.titleTextAttributes = dict as? [NSAttributedStringKey : AnyObject]
    //item颜色
    nav.navigationBar.tintColor = UIColor.gray
    window?.rootViewController = nav
    window?.makeKeyAndVisible()
    return true
}

Swift按钮传参数方法定义

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    func initLeftAndRightBarItem() {
//        let button = UIButton(frame: CGRect(x: 100, y: 200, width: 100, height: 100))
//        button.addTarget(self, action: #selector(obclick(sender:)), for: .touchUpInside)
//        button.backgroundColor = UIColor.red
//        self.view.addSubview(button)
        let leftBarBtnItem = UIBarButtonItem(image: UIImage.init(named: "tab_write"), style: .done, target: self, action: #selector(leftBtnClick(leftBarItem:)))
        let rightBarBtnItem = UIBarButtonItem(image: UIImage.init(named:"actionsheet"), style: .done, target: self, action: #selector(rightBtnClick(rightBarItem:)))
        
        self.navigationItem.leftBarButtonItem = leftBarBtnItem
        self.navigationItem.rightBarButtonItem = rightBarBtnItem
    }
    
//    @objc func obclick(sender:UIButton) {
//        print(#function)
//        print("asdasdasd")
//    }
    
    @objc func leftBtnClick(leftBarItem: UIBarButtonItem) {
        
    }
    
    @objc func rightBtnClick(rightBarItem: UIBarButtonItem) {
        
    }

Swift 中懒加载定义 tableView 两种不同的方法

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lazy var homeTableView = UITableView(frame: CGRect(x: 0, y: kNavHeight, width: kScreenWidth, height: kScreenHeight), style: .plain)
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lazy var secondTableView = {
            return UITableView(frame: CGRect(x: 0, y: kNavHeight, width: kScreenWidth, height: kScreenHeight), style: .plain)
        }()