iOS基于UIScrollView实现滑动引导页

上代码前，我们先来看下实现的效果图：

WelcomeViewController.h

#import <UIKit/UIKit.h> 

@interface WelcomeViewController : UIViewController 

@end

WelcomeViewController.m

#import "WelcomeViewController.h"
#define IMAGECOUNT 3 

@interface WelcomeViewController () <UIScrollViewDelegate>
@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<IMAGECOUNT; 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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