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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
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