class AppDelegate: UIResponder, UIApplicationDelegate {
//應用程序窗口，是AppDelegate類的屬性
var window: UIWindow?
//lazy var array:[Int] = Array()
//應用程序加載完成時觸發這個方法
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
//想再window對象添加內容，就在這個方法中實現
//UIScreen屏幕類
//UIScreen.main獲取屏幕對象
//UIScreen.main.bounds獲取當前設備屏幕大小
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.backgroundColor = #colorLiteral(red: 0.2588235438, green: 0.7568627596, blue: 0.9686274529, alpha: 1)//輸入color 回車? = UIColor.green
//使window成為應用程序主窗口并使其可見
self.window?.makeKeyAndVisible()
//給window設置根視圖控制器（現在只做了解）
self.window?.rootViewController = UIViewController()
//一般應用程序只有一個UIWindow對象
//UIView的創建方式
//1.創建一個子視圖 左上角
/*
let radView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
radView.backgroundColor = #colorLiteral(red: 1, green: 0.2527923882, blue: 1, alpha: 1)
//向window上添加一個子視圖
self.window?.addSubview(radView)
//獲取屏幕的寬和高
let screenWidth = UIScreen.main.bounds.size.width
let screenHeight = UIScreen.main.bounds.size.height
//2.創建一個子視圖 右上角
let greenView = UIView(frame: CGRect(x: screenWidth - 100, y: 0, width: 100, height: 100))
greenView.backgroundColor = UIColor.green
//向window上添加一個子視圖
self.window?.addSubview(greenView)
//3.創建一個子視圖 右下角
let magentaView = UIView(frame: CGRect(x: screenWidth - 100, y: screenHeight - 100, width: 100, height: 100))
magentaView.backgroundColor = UIColor.darkGray
self.window?.addSubview(magentaView)
//4.創建一個子視圖 左下角
let purpleView = UIView(frame: CGRect(x: 0, y: screenHeight - 100, width: 100, height: 100))
purpleView.backgroundColor = UIColor.brown
self.window?.addSubview(purpleView)
//5.創建一個子視圖 中心點
let yellowView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
//yellowView中心點和window中心點重合
yellowView.center = (self.window?.center)!
yellowView.backgroundColor = #colorLiteral(red: 0.9686274529, green: 0.78039217, blue: 0.3450980484, alpha: 1)
self.window?.addSubview(yellowView)
*/
let centerView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
centerView.backgroundColor = #colorLiteral(red: 0.9372549057, green: 0.3490196168, blue: 0.1921568662, alpha: 1)
self.window?.addSubview(centerView)
//UIView的常用屬性
//alpha 透明度 0.0--1.0? 1.0完全不透明
centerView.alpha = 1.0
//hidden顯示隱藏? 顯隱性? true是隱藏 false顯示（默認的）
centerView.isHidden = false
//superView 超視圖獲取到父視圖的屬性
let fatherView = centerView.superview
fatherView?.backgroundColor = UIColor.green
//向centerview上添加子視圖
let greenView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
greenView.backgroundColor = #colorLiteral(red: 0.5568627715, green: 0.3529411852, blue: 0.9686274529, alpha: 1)
//子視圖超出父視圖的邊界就把超出的部分剪掉（了解）
//centerView.clipsToBounds = true
//tag值屬性 給一個視圖添加一個唯一標識（0～100內不再使用）
greenView.tag = 200//整數值
centerView.addSubview(greenView)
//獲取subview屬性，獲取子視圖屬性 只能有一個父視圖 多個子視圖,返回值是一個數組,數組元素有序
let arr = centerView.subviews
let newView = arr[0]
newView.backgroundColor = #colorLiteral(red: 0.9764705896, green: 0.850980401, blue: 0.5490196347, alpha: 1)
//根據tag值獲取視圖對象
let newView2 = centerView.viewWithTag(200)
newView.backgroundColor = #colorLiteral(red: 0.5568627715, green: 0.3529411852, blue: 0.9686274529, alpha: 1)
//? ? ? ? let newView3 = centerView.viewWithTag(200)
//? ? ? ? newView.backgroundColor = #colorLiteral(red: 0.521568656, green: 0.1098039225, blue: 0.05098039284, alpha: 1)
return true
}
//應用程序將要取消活躍狀態時觸發
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
//已經進入后臺的時候觸發
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
//將要進入前臺的時候觸發
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
//應用程已經變得活躍的時候觸發
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
//程序將要結束的時候觸發
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}
