ios 圖片自動輪播

#import "NYViewController.h"#define kImageCount 5@interface NYViewController () <UIScrollViewDelegate>
@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) UIPageControl *pageControl;@property (nonatomic, strong) NSTimer *timer;
@end@implementation NYViewController//懶加載加載scrollView
-(UIScrollView *)scrollView
{if (_scrollView == nil) {_scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(10, 20, 300, 130)];_scrollView.backgroundColor = [UIColor redColor];[self.view addSubview:_scrollView];//contentSize//高度為0 只水平滾動self.scrollView.contentSize = CGSizeMake(kImageCount * _scrollView.bounds.size.width, 0);//取消彈簧效果_scrollView.bounces = NO;//取消滾動條_scrollView.showsHorizontalScrollIndicator = NO;//水平_scrollView.showsVerticalScrollIndicator = NO;//豎直//要分頁_scrollView.pagingEnabled = YES;//設置代理_scrollView.delegate = self;}return _scrollView;
}-(UIPageControl *)pageControl
{if (_pageControl == nil) {//分頁控件，本質上和scrollView沒有任何關系，是兩個獨立的控件_pageControl = [[UIPageControl alloc]init];//總頁數_pageControl.numberOfPages = kImageCount;//控件尺寸CGSize size = [_pageControl sizeForNumberOfPages:kImageCount];_pageControl.bounds = CGRectMake(0, 0, size.width, size.height);_pageControl.center = CGPointMake(self.view.center.x, 130);//設置顏色_pageControl.pageIndicatorTintColor = [UIColor redColor];_pageControl.currentPageIndicatorTintColor = [UIColor blackColor];[self.view addSubview:_pageControl];//添加監聽方法/**在OC中，絕大多數“繼承UIControl控件”，都可以監聽UIControlEventValueChanged事件，只有button除外，button是點得，是touchup。。。*/[_pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];}return _pageControl;
}//分頁控件的監聽方法
-(void)pageChanged:(UIPageControl *)page
{//根據頁數，調整滾動視圖中得圖片位置contentOffsetCGFloat x = page.currentPage * self.scrollView.bounds.size.width;[self.scrollView setContentOffset:CGPointMake(x, 0) animated:YES];
}- (void)viewDidLoad
{[super viewDidLoad];//設置圖片for (int i = 0; i<kImageCount; i++) {NSString *imageName = [NSString stringWithFormat:@"img_%02d", i+1 ];UIImage *image = [UIImage imageNamed:imageName];UIImageView *imageView = [[UIImageView alloc] initWithFrame: self.scrollView.bounds];imageView.image = image;[self.scrollView addSubview:imageView];}//計算imageView的位置[self.scrollView.subviews enumerateObjectsUsingBlock:^(UIImageView *imageView, NSUInteger idx, BOOL *stop) {//調整x =》 origin =》frameCGRect frame = imageView.frame;frame.origin.x = idx * frame.size.width;imageView.frame = frame;}];//分頁初始頁數為0self.pageControl.currentPage = 0;//啟動時鐘
    [self startTimer];}/**啟動時鐘*/
-(void)startTimer
{self.timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];//添加運行循環
    [[NSRunLoop currentRunLoop]addTimer:self.timer forMode:NSRunLoopCommonModes];}-(void)updateTimer
{//頁號發生變化//（當前頁數 + 1） % 總頁數int page = (self.pageControl.currentPage+1) % kImageCount;self.pageControl.currentPage = page;//調用監聽方法。讓滾動視圖滾動
    [self pageChanged:self.pageControl];
}#pragma mark - scrollView的代理方法//滾動視圖停下來
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{// 停下來的當前頁數,通過contentOffset獲取當前偏移量NSLog(@"%@",NSStringFromCGPoint(scrollView.contentOffset));//計算頁數int page = scrollView.contentOffset.x/scrollView.bounds.size.width;self.pageControl.currentPage = page;}/**抓住圖片時，停止時鐘，松手后，開啟時鐘*/
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{//停止時鐘，停止后就不能在使用，如果要啟用時鐘，需要重新實例化
    [self.timer invalidate];
}-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{//啟動時鐘
    [self startTimer];}
@end

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posted on 2015-07-30 17:48 高手superior 閱讀(...) 評論(...) 編輯 收藏

轉載于:https://www.cnblogs.com/jackson-leung/p/4690080.html

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