#import "ViewController.h"
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height
@interface ViewController ()
@property(nonatomic,strong) UIScrollView * scrollV;
@property(nonatomic,strong) UIPageControl * pageControl;
@property(nonatomic,strong) NSTimer * timer;
@property(nonatomic,strong) NSArray * imageArr;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.imageArr=@[@"IMG_0003",@"IMG_0225",@"IMG_1057",@"IMG_1058",@"IMG_1060"];
_scrollV = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, 380)];
_scrollV.delegate =self;
_scrollV.bounces=NO;
[self.view addSubview:_scrollV];
_scrollV.contentSize = CGSizeMake(WIDTH * _imageArr.count, HEIGHT);
_scrollV.pagingEnabled = YES;
//添加图片
for(inti =0; i<_imageArr.count; i++) {
//创建图片对象
UIImageView* imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(i*WIDTH,0,WIDTH,380)];
imageView.image= [UIImageimageNamed:self.imageArr[i]];
[_scrollVaddSubview:imageView];
}
_pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 350, WIDTH,20)];
//_pageControl.backgroundColor = [UIColor redColor];
_pageControl.alpha = 0.5;
//设置圆点的个数
_pageControl.numberOfPages = _imageArr.count;
//添加事件
[_pageControl addTarget:self action:@selector(valueChanage:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:_pageControl];
//创建事件定时器
[self startTimer];
}
//pageControl 点击事件，点击PageCt 改变滚动视图的偏移量
-(void)valueChanage:(UIPageControl*)pc
{
NSIntegercurrentPage = pc.currentPage;
//设置scrollV的偏移量
[_scrollV setContentOffset:CGPointMake(currentPage * WIDTH,0) animated:YES];
}
//滚动视图停止滚动的时候
-(void)scrollViewDidScroll:(UIScrollView*)scrollView
{
NSLog(@"滚动的时候会调用");
_pageControl.currentPage = scrollView.contentOffset.x/WIDTH + 0.5;
}
//定时器方法，定时滚动图片
-(void)ChangeImage{
if (self.pageControl.currentPage==_imageArr.count-1) {
self.pageControl.currentPage=0;
[self.scrollV setContentOffset:CGPointMake(0, 0)];
}
[_scrollV setContentOffset:CGPointMake((self.pageControl.currentPage+1)*WIDTH, 0) animated:YES];
}
//停止定时器
- (void)stopTimer
{
[self.timer invalidate];
self.timer=nil;
}
//创建定时器
- (void)startTimer {
_timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(ChangeImage)userInfo:nil repeats:YES];
// 调整timer 的优先级
NSRunLoop*mainLoop = [NSRunLoopmainRunLoop];
[mainLoopaddTimer:_timer forMode:NSRunLoopCommonModes];
}
/**
手指开始拖动的时候, 就让计时器停止
*/
- (void)scrollViewWillBeginDragging:(UIScrollView*)scrollView {
[self stopTimer];
}
/**
手指离开屏幕的时候, 就让计时器开始工作
*/
- (void)scrollViewWillEndDragging:(UIScrollView*)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inoutCGPoint*)targetContentOffset {
[self startTimer];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end