iOS图片轮播

基于ScrollView的图片播放

ScrollView的方法
NSTime的循环
UIPageControl的运用
委托方法
基于iphone5 未做屏幕的适配

import "ViewController.h"

@interface ViewController ()<UIScrollViewDelegate>

@property(nonatomic,strong) UIScrollView *scrollView;       //声明一个UIScrollView

@property(nonatomic, strong)UIPageControl *pageControl;     //声明一个UIPageControl

@property (nonatomic, strong) NSTimer *timer;

@end

@implementation ViewController

//设置ScrollView

-(UIScrollView*)scrollView{

    if(_scrollView==nil){

    	//初始化位置

        _scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 20, 320, 530)];

        self.scrollView.contentSize=CGSizeMake(4*_scrollView.bounds.size.width, 0);

        self.scrollView.pagingEnabled=YES;

        self.scrollView.bounces=NO;

        self.scrollView.showsHorizontalScrollIndicator=NO;

        self.scrollView.showsVerticalScrollIndicator=NO;

        //委托

        self.scrollView.delegate = self;

        [self.view addSubview:_scrollView];

    }

    return _scrollView;

}

//分页设置

-(UIPageControl*)pageControl{

    if(_pageControl==nil){

        _pageControl=[[UIPageControl alloc]init];

        _pageControl.numberOfPages=4;

        _pageControl.bounds=CGRectMake(0, 0, 150, 20);

        //设置中心

        _pageControl.center=CGPointMake(self.view.center.x, self.scrollView.frame.size.height+30);

        _pageControl.pageIndicatorTintColor=[UIColor redColor];

        _pageControl.currentPageIndicatorTintColor=[UIColor blackColor];

        [self.view addSubview:_pageControl];

        //页数改变

        [_pageControl addTarget:self action:@selector(pageChange:) forControlEvents:UIControlEventValueChanged];

    }

    return _pageControl;

}

//页数改变事件

-(void)pageChange:(UIPageControl*)pageCtrl{

	//页数改变同时变更scrollView

    [self.scrollView setContentOffset:CGPointMake(pageCtrl.currentPage*self.scrollView.bounds.size.width, 0) animated:YES];

}

//scrollView的contentOffset 改变

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

    CGFloat scrollviewW =  scrollView.frame.size.width;

    CGFloat x = scrollView.contentOffset.x;

    int page = (x + scrollviewW / 2) /  scrollviewW;

    self.pageControl.currentPage=page;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    for (int i=0; i<4; i++) {

        NSString *imageName= [NSString  stringWithFormat:@"%02d",i+1]  ;

        UIImage *image=[UIImage  imageNamed:imageName];

        UIImageView *imageView =[[UIImageView alloc]initWithFrame:self.scrollView.bounds];

        imageView.image=image;

        [self.scrollView addSubview:imageView ];

    }

    //循环

    [self.scrollView.subviews enumerateObjectsUsingBlock:^(UIImageView *imageView, NSUInteger idx, BOOL *stop) {

        CGRect  frame = imageView.frame;

        //索引变化的时候改变坐标位置

        frame.origin.x=frame.size.width*idx;

        imageView.frame=frame;

    }];

    //默认从第一个

    self.pageControl.currentPage=0;

    [self startTimer];

}

//绑定上timer

- (void)startTimer

{

    self.timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];

    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

//更新timer

- (void)updateTimer

{

    int page = (self.pageControl.currentPage + 1) % 4;

    self.pageControl.currentPage = page;

    [self pageChange:self.pageControl];

}

@end
巴特西

iOS图片轮播

基于ScrollView的图片播放

基于iphone5 未做屏幕的适配

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