ios基于什么系统_iOS基于UIScrollView实现滑动引导页

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上代码前，我们先来看下实现的效果图：

WelcomeViewController.h

#import

@interface WelcomeViewController : UIViewController

@end

WelcomeViewController.m

#import "WelcomeViewController.h"

#define IMAGECOUNT 3

@interface WelcomeViewController ()

@property (nonatomic, strong)UIPageControl *pageControl;

@end

@implementation WelcomeViewController

- (void)viewDidLoad {

  [super viewDidLoad];

  //创建ScrollView

  UIScrollView *sv = [[UIScrollView alloc] init];

  sv.frame = self.view.bounds;

  //设置边缘不弹跳

  sv.bounces = NO;

  //整页滚动

  sv.pagingEnabled = YES;

  sv.showsHorizontalScrollIndicator = NO;

  //加入多个子视图(ImageView)

  for(NSInteger i=0; i

    NSString *imgName = [NSString stringWithFormat:@"%ld", i+1];

    UIImage *image = [UIImage imageNamed:imgName];

    UIImageView *imageView = [[UIImageView alloc]initWithImage:image];

    CGRect frame = CGRectZero;

    frame.origin.x = i * sv.frame.size.width;

    frame.size = sv.frame.size;

    imageView.frame = frame;

    [sv addSubview:imageView];

    if(i==IMAGECOUNT-1){

      //开启图片的用户点击功能

      imageView.userInteractionEnabled = YES;

      //加个按钮

      UIButton *button = [[UIButton alloc]init];

      button.frame = CGRectMake((imageView.frame.size.width-150)/2, imageView.frame.size.height*0.8, 150, 40);

      button.backgroundColor = [UIColor orangeColor];

      [button setTitle:@"立即体验"forState:UIControlStateNormal];

      button.titleLabel.font = [UIFont boldSystemFontOfSize:16];

      [imageView addSubview:button];

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

  }

  sv.contentSize = CGSizeMake(IMAGECOUNT * sv.frame.size.width, sv.frame.size.height);

  [self.view addSubview:sv];

  //加入页面指示控件PageControl

  UIPageControl *pageControl = [[UIPageControl alloc]init];

  self.pageControl = pageControl;

  //设置frame

  pageControl.frame = CGRectMake(0, self.view.frame.size.height - 40, self.view.frame.size.width, 20);

  //分页面的数量

  pageControl.numberOfPages = IMAGECOUNT;

  //设置小圆点渲染颜色

  pageControl.pageIndicatorTintColor = [UIColor whiteColor];

  //设置当前选中小圆点的渲染颜色

  pageControl.currentPageIndicatorTintColor = [UIColor redColor];

  //关闭用户点击交互

  pageControl.userInteractionEnabled = NO;

  [self.view addSubview:pageControl];

  sv.delegate = self;

}

- (void)enter

{

  NSLog(@"进入应用");

}

//UIScrollViewDelegate方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

  CGPoint offset = scrollView.contentOffset;

  if(offset.x<=0){

    offset.x = 0;

    scrollView.contentOffset = offset;

  }

  NSUInteger index = round(offset.x / scrollView.frame.size.width);

  self.pageControl.currentPage = index;

}

- (void)didReceiveMemoryWarning {

  [super didReceiveMemoryWarning];

  // Dispose of any resources that can be recreated.

}

@end

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