iOS学习笔记 APP启动相关

AppDelegate对象方法

# 程序第一次启动后才会执行- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions;# 程序将要失去焦点时执行- (void)applicationWillResignActive:(UIApplication *)application;# 程序得到焦点时调用- (void)applicationDidBecomeActive:(UIApplication *)application;# 程序进入后台执行- (void)applicationDidEnterBackground:(UIApplication *)application;# 程序进入前台执行- (void)applicationDidEnterForeground:(UIApplication *)application;# 程序即将退出时调用- (void)applicationWillTerminate:(UIApplication *)application;# 程序发生内存警告的时候调用- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application;

AppDelegate方法调用顺序

APP启动加载

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    // 设置window属性（iOS应用必须有一个主窗口UIWindow），初始化windows的大小和位置    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    // 设置window的背景    self.window.backgroundColor = [UIColor whiteColor];    // 初始化KCMainViewController    KCMainViewController *mainController = [[KCMainViewController alloc]init];    // 设置自定义控制器的大小和window相同，位置为（0，0）    mainController.view.frame = self.window.bounds;    // 设置此控制器为window的根控制器，UIWindown必须有根控制器    self.window.rootViewController = mainController;    // 设置window为应用程序主窗口并设为可见    [self.window makeKeyAndVisible];    return YES;}

UIApplication常用属性和方法

# 属性// 显示应用图标右上角数字application.applicationBadgeNumber = 8;// 设置状态栏样式application.statusBarStyle = UIStatusBarStyleBlackOpaque;// 显示或隐藏状态栏application.statusBarHidden = YES;// 状态栏网络请求状态application.networkActivityIndicatorVisible = YES;# 方法// 用默认浏览器打开网页[application openURL:[NSURL urlWithString:@"http://www.baidu.com"]];// 打电话[application openURL:[NSURL urlWithString:@"tel://xxxxxxxxx"]];// 发短信[application openURL:[NSURL urlWithString:@"sms://xxxxxxxxx"]];