IOS笔记UI--首次启动介绍和LaunchDemo

来源：互联网发布：可爱表情贴图软件编辑：程序博客网时间：2024/05/01 14:09

申明：此为本人学习笔记，若有纰漏错误之处的可留言共同探讨

制作首次启动介绍app和Launch的效果，主要是通过在appDelegate里判断是不是第一次登陆该app，如果是，就将根视图赋给首次启动的那个VC（ViewController），如果不是就将根视图赋给launchVC。

首次启动介绍和Launch思路

1.在appDelegate里，通过NSUserDefaults判断是不是第一次启动，如果是，把根视图给first；反之则把根视图赋给launch

2.在first首次启动介绍app这个VC里面呢。创建一个scrollVIew。需要几个介绍页面就创建几个UIImageView，然后在最后一个UIimageView加上手势，点击跳转到主视图

3.在launchVC里，使用performSelector这个方法，延时需要的时间长度，然后跳回主视图即可

代码部分：

appDelegate判断部分

 if (![[NSUserDefaults standardUserDefaults]boolForKey:@"first"]) {        // the first        [[NSUserDefaults standardUserDefaults]setBool:YES forKey:@"first"];        self.window.rootViewController = [[FLViewController alloc]init];    } else {        // not first        self.window.rootViewController = [[LaunchViewController alloc]init];    }

firstVC部分

#define MY_SCREEN_WIDTH self.view.bounds.size.width#define MY_SCREEN_HEIGHT self.view.bounds.size.height#define SCROLLVIEW_PAGE_NUMBER 4#define ARC4RANDOM [UIColor colorWithRed:arc4random()%256/255. green:arc4random()%256/255. blue:arc4random()%256/255. alpha:1]@interface FLViewController ()<UIScrollViewDelegate>@end@implementation FLViewController- (void)viewDidLoad {    [super viewDidLoad];    // ScrollView    UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:self.view.frame];    scrollView.contentSize = CGSizeMake(MY_SCREEN_WIDTH*SCROLLVIEW_PAGE_NUMBER,MY_SCREEN_WIDTH);    [self.view addSubview:scrollView];    scrollView.pagingEnabled = YES;    scrollView.contentOffset =CGPointMake(0, 0);    scrollView.showsHorizontalScrollIndicator =NO;    scrollView.delegate = self;    scrollView.bounces = NO;        UIImageView *imageView;    for (int i = 0 ; i<SCROLLVIEW_PAGE_NUMBER; i++) {      imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i*375, 0, MY_SCREEN_WIDTH, MY_SCREEN_HEIGHT)];        imageView.backgroundColor = ARC4RANDOM;        [scrollView addSubview:imageView];        imageView.tag = 1+i;    }    [imageView setUserInteractionEnabled:YES];    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(gotoMain:)];    [[self.view viewWithTag:SCROLLVIEW_PAGE_NUMBER] addGestureRecognizer:tap];    }#pragma mark - UITapGestureRecognizer-(void)gotoMain:(UITapGestureRecognizer *)tap {    ViewController *view = [[ViewController alloc]init];    [self presentViewController:view animated:NO completion:nil];}

launchVC部分

#import "LaunchViewController.h"#import "ViewController.h"@interface LaunchViewController ()@end@implementation LaunchViewController- (void)viewDidLoad {    [super viewDidLoad];    UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.view.frame];    [self.view addSubview:imageView];    UIImage *image = [UIImage imageNamed:@"myPic.jpg"];    imageView.image = image;    [self performSelector:@selector(gotoMain) withObject:self afterDelay:1.5];}#pragma mark - -(void)gotoMain {    ViewController *mainVC = [[ViewController alloc]init];    [self presentViewController:mainVC animated:NO completion:nil];}

附上本人完整Demo：http://download.csdn.net/detail/csdn_hhg/9207599

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