IOS-ScrollView创造Android-ViewPager效果

1.将图片放进images文件夹,并改名为images.bundle.拖进项目中

2拖动scrollView 并在左上角按住Scroll View 拖到View Controller中 选择deleagte.

这时候.指定Scroll View的代理为controller. 

为指定的controller加上代理

#import <UIKit/UIKit.h>

@interface CSZViewController : UIViewController <UIScrollViewDelegate>

//ViewPager
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;

@end

@implementation CSZViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    int width=self.view.frame.size.width;
    int height=self.view.frame.size.height;
    
    //从bundle压缩文件中取出多页的内容路径
    NSString *bundlePath=[[NSBundle mainBundle] pathForResource:@"images" ofType:@"bundle"];
    NSBundle *bundle=[[NSBundle alloc] initWithPath:bundlePath];
    self.imagesArr=[bundle pathsForResourcesOfType:@"jpg" inDirectory:nil];
	self.scrollView.contentSize=CGSizeMake(self.imagesArr.count*width,height);
    
    //创建分页
    for (int i=0; i<self.imagesArr.count; i++) {
        UIImageView *itemImage=[[UIImageView alloc] init];
        itemImage.image=[UIImage imageWithContentsOfFile:self.imagesArr[i]];
        itemImage.frame=CGRectMake(i*width, 0, width, height);
        [self.scrollView addSubview:itemImage];
    }
    
    //消除滑动时出现的滑块
    self.scrollView.showsHorizontalScrollIndicator=NO;
    //使ViewPager富有弹性.分割每页
    self.scrollView.pagingEnabled=YES;
    //创建标识
    UIPageControl *ctr=[[UIPageControl alloc] init];
    ctr.bounds=CGRectMake(0, 0, 150, 50);
    ctr.center=CGPointMake(width*0.5, height-50);

    ctr.currentPageIndicatorTintColor=[UIColor redColor];
    ctr.pageIndicatorTintColor=[UIColor grayColor];
    ctr.currentPage=1;
    //声明指示器的个数。如果不设置将不显示
    ctr.numberOfPages=self.imagesArr.count;
    [ctr addTarget:self action:@selector(pageIndict:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:ctr];
    //因为self.view已经绑定了一次，所以pageControl为弱引用
    self.pageControl=ctr;
}

#pragma mark 点击指示器 跳转ViewPager
- (IBAction)pageIndict:(id)sender
{
    int curr=self.pageControl.currentPage;
    NSLog(@"%d",curr);
    self.scrollView.contentOffset=CGPointMake(self.view.frame.size.width*curr, 0)
    ;
}

#pragma mark 当滑动ViewPager时停下来 让对应的指示器进行改变
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    int offSetX=self.scrollView.contentOffset.x;
    int index=offSetX/self.view.frame.size.width;
    self.pageControl.currentPage=index;
    
}

@end

-----------附加知识点-----------

self.scroll.backgroundColor=[UIColor grayColor];//设置背景颜色

self.scroll.contentInset=UIEdgeInsetsMake(0, 10, 0, 10);//设置边距偏移量

self.scroll.pagingEnabled=YES;//设置分页功能

self.scroll.showsHorizontalScrollIndicator=NO;//设置水平滑块