iOS 引导页

在AppDelegate.m中：

我们需要两个Viewcongtroller来实现；

myViewController是我的引导页面视图控制器

MainViewController是我们滑动完引导页 点击按钮以后进入的主页面。

#import "AppDelegate.h"

#import "myViewController.h"

#import "MainViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

NSUserDefaults *useDef = [NSUserDefaults standardUserDefaults];

// 使用 NSUserDefaults 读取用户数据

if (![useDef boolForKey:@"notFirst"]) {

// 如果是第一次进入引导页

_window.rootViewController = [[myViewController alloc] init];

}

    else{

// 否则直接进入应用

_window.rootViewController = [[MainViewController alloc] init];

}

return YES;

}

myViewController.m中：

#import "myViewController.h"

#import "MainViewController.h"

#define WIDTH (NSInteger)self.view.bounds.size.width

#define HEIGHT (NSInteger)self.view.bounds.size.height

@interface myViewController ()

{

// 创建页码控制器

UIPageControl *pageControl;

// 判断是否是第一次进入应用

BOOL flag;

}

@end

@implementation myViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

UIScrollView *myScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];

for (int i=0; i<3; i++) {

UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"Y%d.jpg",i+1]];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(WIDTH * i, 0, WIDTH, HEIGHT)];

// 在最后一页创建按钮

if (i == 2) {

// 必须设置用户交互 否则按键无法操作

imageView.userInteractionEnabled = YES;

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

button.frame = CGRectMake(WIDTH / 3, HEIGHT * 7 / 8, WIDTH / 3, HEIGHT / 16);

[button setTitle:@"点击进入" forState:UIControlStateNormal];

[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

button.layer.borderWidth = 2;

button.layer.cornerRadius = 5;

button.clipsToBounds = YES;

button.layer.borderColor = [UIColor whiteColor].CGColor;

[button addTarget:self action:@selector(go:) forControlEvents:UIControlEventTouchUpInside];

[imageView addSubview:button];

}

imageView.image = image;

[myScrollView addSubview:imageView];

}

myScrollView.bounces = NO;

myScrollView.pagingEnabled = YES;

myScrollView.showsHorizontalScrollIndicator = NO;

myScrollView.contentSize = CGSizeMake(WIDTH * 3, HEIGHT);

myScrollView.delegate = self;

[self.view addSubview:myScrollView];

pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(WIDTH / 3, HEIGHT * 15 / 16, WIDTH / 3, HEIGHT / 16)];

// 设置页数

pageControl.numberOfPages = 3;

// 设置页码的点的颜色

pageControl.pageIndicatorTintColor = [UIColor yellowColor];

// 设置当前页码的点颜色

pageControl.currentPageIndicatorTintColor = [UIColor redColor];

[self.view addSubview:pageControl];

}

#pragma mark - UIScrollViewDelegate

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

// 计算当前在第几页

pageControl.currentPage = (NSInteger)(scrollView.contentOffset.x / [UIScreen mainScreen].bounds.size.width);

}

// 点击按钮保存数据并切换根视图控制器

- (void) go:(UIButton *)sender{

flag = YES;

NSUserDefaults *useDef = [NSUserDefaults standardUserDefaults];

// 保存用户数据

[useDef setBool:flag forKey:@"notFirst"];

[useDef synchronize];

// 切换根视图控制器

self.view.window.rootViewController = [[MainViewController alloc] init];

}