iOS 引导页面启动一次

#import "AppDelegate.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];

    //增加标识，用于判断是否是第一次启动应用...
    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"everLaunched"]) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"everLaunched"];
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];
    }

    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {
        ViewController *appStartController = [[ViewController alloc] init];
        self.window.rootViewController = appStartController;
    }else {
        //NextViewController *mainViewController = [[NextViewController alloc] init];
        //self.window.rootViewController=mainViewController;
    }
    [self.window makeKeyAndVisible];
    return YES;
}