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SB里只需要两个控件： |
UIScrollView
UIPageControl
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<br><br><br>@interface
LYViewController () <UIScrollViewDelegate>/** scrollView */@property
(weak, nonatomic) IBOutlet
UIScrollView *scrollVIew;/** 图片页数 */@property
(weak, nonatomic) IBOutlet
UIPageControl *pageNumber;/** timer */@property
(nonatomic, strong) NSTimer
*timer;@end@implementation
LYViewController- (void)viewDidLoad{ [super
viewDidLoad]; // 设置图片 for
(int i = 0; i < kImageCount; i ++) { UIImageView *imageView = [[UIImageView alloc] init]; imageView.frame = CGRectMake(i * kWidth, 0, kWidth, kHeight); NSString
*imageName = [NSString
stringWithFormat:@"img_%02d", i+1]; imageView.image = [UIImage imageNamed:imageName]; [self.scrollVIew addSubview:imageView]; } // 滚动效果 self.scrollVIew.contentSize = CGSizeMake(kImageCount * kWidth, kHeight); // 取消垂直方向的滚动条 self.scrollVIew.showsVerticalScrollIndicator = NO; // 半自动分页 self.scrollVIew.pagingEnabled = YES; // 设置代理 self.scrollVIew.delegate = self; // 自动播放 [self
startTimer];}#pragma mark 代理方法- (void)nextImage{ if
(self.pageNumber.currentPage == kImageCount - 1) { self.pageNumber.currentPage = 0; }else{ self.pageNumber.currentPage ++; } CGFloat currentX = kWidth * (self.pageNumber.currentPage); // 设置手机屏幕的位置 [self.scrollVIew setContentOffset:CGPointMake(currentX, 0) animated:YES];}// 只要图片滚动，就会计算图片当前页数- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ if
(!self.timer) { // 设置图片页数 CGFloat currentX = self.scrollVIew.contentOffset.x; self.pageNumber.currentPage = (currentX + kWidth * 0.5) / kWidth; }}// 拖动时，关闭计时器- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ [self.timer invalidate]; self.timer = nil;}// 结束拖动，开始计时器- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{ [self
startTimer];}// 开启计时器方法- (void)startTimer{ self.timer = [NSTimer
timerWithTimeInterval:1.f target:self
selector:@selector(nextImage) userInfo:nil
repeats:YES]; [[NSRunLoop
mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];}@end |
原文地址：http://www.cnblogs.com/daliye-blog/p/3760246.html
