iOS引导页

「爱情、让人受尽委屈。」 2022-06-08 00:11 257阅读 0赞

这是我写的一个例子的效果图（图片是随便找的）：

![strip][]

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 ()<UIScrollViewDelegate>
    {
        // 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];
    }

作者：有味道的简书  
链接：http://www.jianshu.com/p/f7ae99e328fc  
來源：简书  
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 [点击打开链接][Link 1]

[strip]: /images/20220608/b32510dd83cd4b25833ec7a03ba8e0ce.png
[Link 1]: http://www.jianshu.com/p/f7ae99e328fc