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来源：互联网发布：呼死你在淘宝上叫什么编辑：程序博客网时间：2024/06/13 18:36

#import "AppDelegate.h"- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];       //4、1、3、2        //alloc]init]方法调用之后，会去调用 initWithNibName方法；之后，回到入口类继续向下执行 ；当window.rootViewController = vc 代码h执行之后，会去调用viewDidLoad方法；之后回到入口类继续执行    FirstViewController * vc = [[FirstViewController alloc]init];    NSLog(@"1");    self.window.rootViewController = vc ;    NSLog(@"2");        return YES;}

#import "FirstViewController.h"- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self)    {        NSLog(@"4");    }    return self;}//先加载xib，再执行viewDidLoad ;注意视图的层次 - (void)viewDidLoad{    [super viewDidLoad];       NSLog(@"3");}

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