iOS - 程序设计之程序启动-优快云博客

本文介绍了一个iOS应用启动过程中的各种动画实现方式，包括程序启动欢迎界面、倒计时跳过功能、滑动的scrollview及流媒体动画等，并提供了详细的代码示例。

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程序启动欢迎界面

程序启动

程序启动时间设置

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.

    [NSThread sleepForTimeInterval:5];
    return YES;
}

程序启动时是否隐藏状态栏

* info.plist中添加键值对,`Status bar is initially hidden` = `YES`即可

一张图

* 一张图透明度渐变到完全透明到最后消失
* 只需要在rootViewController的viewDidLoad中获取keyWindow并且将要显示的内容加到keyWindow中即可.透明度逐渐减小,最后移除.

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor redColor];
    UIImageView * imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    imageView.image = [UIImage imageNamed:@"101"];
    [[UIApplication sharedApplication].keyWindow addSubview:imageView];
    [UIView animateWithDuration:2.0 delay:1 options:0 animations:^{
        imageView.alpha = 0;
    } completion:^(BOOL finished) {
        [imageView removeFromSuperview];
    }];
}

倒计时,可点击跳过

* 在上面的基础上增加定时器

-(void)setUI{

    UIImageView * imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    imageView.image = [UIImage imageNamed:@"101"];
    [[UIApplication sharedApplication].keyWindow addSubview:imageView];
    [UIView animateWithDuration:2.0 delay:1 options:0 animations:^{
        imageView.alpha = 0;
    } completion:^(BOOL finished) {
        [imageView removeFromSuperview];
    }];

    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeLabel) userInfo:nil repeats:YES];
    NSRunLoop * currentRunloop = [NSRunLoop currentRunLoop];
    //runloop循环模式要写成NSRunLoopCommonModes 否则如果有滚动的view在这个界面上定时器会停止计时
    [currentRunloop addTimer:self.timer forMode:NSRunLoopCommonModes];
}

-(void)changeLabel{

    self.time --;
    if (self.time < 0) {

        NSLog(@"倒计时完成");
        [self.timer invalidate];
        self.timer = nil;
        self.lblName.hidden = YES;
        return;
    }
    self.lblName.text = [NSString stringWithFormat:@"%zds 跳过",self.time];
}

滑动的scrollview

//所需属性
/* 滚动视图 */
@property (strong, nonatomic) UIScrollView * scrollView;
/* 分页 */
@property (strong, nonatomic) UIPageControl * pageControl;
/* 登录按钮 */
@property (strong, nonatomic) UIButton * btnLogin;

首先初始化UI界面


- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    [self setUI];
}

-(void)setUI{
    //创建滚动的scrollView
    UIScrollView * scrollView = [UIScrollView new];
    scrollView.backgroundColor = [UIColor whiteColor];
    self.scrollView = scrollView;
    scrollView.bounces = NO;
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.delegate = self;
    scrollView.frame = KScreen_Bounds;
    scrollView.pagingEnabled = YES;
    scrollView.contentSize = CGSizeMake(KScreen_Width*4, KScreen_Height);
    [self.view addSubview:scrollView];

    //在scrollview上添加imageView
    for (int i = 0; i<4; i++) {

        NSString * imageName = [NSString stringWithFormat:@"%zd.jpg",101+i];
        UIImage * image = [UIImage imageNamed:imageName];
        UIImageView * imageView = [UIImageView new];
        CGFloat y = 0;
        CGFloat w = KScreen_Width;
        CGFloat h = KScreen_Height;
        CGFloat x = 0 + KScreen_Width * i;
        imageView.frame = CGRectMake(x, y, w, h);
        imageView.image = image;
        [scrollView addSubview:imageView];

        //在最后一页上添加登录按钮
        if (i == 3) {

            //添加点击进入button
            UIButton * btnLogin = [UIButton new];
            self.btnLogin = btnLogin;
            btnLogin.frame = CGRectMake(3 * KScreen_Width + (KScreen_Width - 200)/2.0, KScreen_Height - 94, 200, 30);
            [btnLogin setTitle:@"点击进入" forState:UIControlStateNormal];
            [btnLogin addTarget:self action:@selector(changeRootVc) forControlEvents:UIControlEventTouchUpInside];
            btnLogin.backgroundColor = [UIColor blueColor];
            btnLogin.layer.cornerRadius = 5;
            btnLogin.layer.masksToBounds = YES;
            [scrollView addSubview:btnLogin];
        }
    }

    //添加pageControl到self.view上
    UIPageControl * pageControl = [[UIPageControl alloc] init];
    self.pageControl = pageControl;
    pageControl.numberOfPages = 4;
    pageControl.frame = CGRectMake((KScreen_Width - 200)/2.0, KScreen_Height - 64, 200, 30);
    [self.view addSubview:pageControl];
}

点击登录切换根控制器

#pragma mark - 更改根控制器
-(void)changeRootVc{

    [UIView animateWithDuration:2.0 delay:0 options:UIViewAnimationOptionLayoutSubviews animations:^{
        self.scrollView.alpha = 0;
    } completion:^(BOOL finished) {
        [self pushToRootVc];
    }];
}

-(void)pushToRootVc{

    UIViewController * vc = [UIViewController new];
    vc.view.frame = KScreen_Bounds;
    vc.view.backgroundColor = [UIColor orangeColor];
    [UIApplication sharedApplication].keyWindow.rootViewController = vc;
}

//停止滚动后设置pageControl的页码
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    CGFloat offset = scrollView.contentOffset.x;
    int currentPage = (int)(offset / KScreen_Width);
    self.pageControl.currentPage = currentPage;
}