判断首次登录

// 判断首次登陆

BOOL isFirstLogin = [[[NSUserDefaults standardUserDefaults] objectForKey:@"isFirstLogin"] boolValue];

if (!isFirstLogin) {

// 是第一次

self.window.rootViewController = [[GuidanceViewController alloc]init];

[[NSUserDefaults standardUserDefaults] setObject:@"YES" forKey:@"isFirstLogin"];

}else{

sleep(2);

//不是首次启动

MainTabBarController *viewCtrl = [[MainTabBarController alloc]init];

self.window.rootViewController = viewCtrl;

}