IOS学习笔记——基础界面 （二）

关于设计模式mvc是最基本的；mvp是数据绑定到页面，单向绑定；mvvm是数据绑定到页面页面也绑定到数据，双向绑定的。

ViewController的生命周期：

viewWillAppear：少量的初始化话工作。

viewDidDisappear：清理工作。

ViewController的几个跳转，有用storyboard的，有用xib的，有直接代码写的界面的：

- (void) tryNibName {  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];  UIViewController * rootVC = [[UIViewController alloc] initWithNibName:@"rootVC" bundle:nil];  self.window.rootViewController = rootVC;  [self.window makeKeyAndVisible];}- (void) tryNibOfUserVCName {  // xib can be MyViewController or MyView  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];  UIViewController * rootVC = [[MyViewController alloc] init];  self.window.rootViewController = rootVC;  [self.window makeKeyAndVisible];}- (void) tryNibOfVCName {  // UI prefix in class name means system class, which will bypass xib lookup!  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];  UIViewController * rootVC = [[UIViewController alloc] init];  self.window.rootViewController = rootVC;  [self.window makeKeyAndVisible];}- (void) tryInfo_plist_storyboard {  // no code, just update Info.plist to set "Main storyboard basename"}- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  [self tryInfo_plist_storyboard];//  [self tryNibName];//  [self tryNibOfVCName];//  [self tryNibOfUserVCName];  return YES;}

关于应用启动：