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#import <UIKit/UIKit.h>
@interface LZJPageView : UIView
/** 图片名数据 */
@property (nonatomic, strong) NSArray *imageNames;
+ (instancetype)pageView;
@end
#import "LZJPageView.h"
@interface LZJPageView () <UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
@property (weak, nonatomic) IBOutlet UIPageControl *pageControl;
/** 定时器 */
@property (nonatomic, weak) NSTimer *timer;
@end
@implementation LZJPageView
- (void)awakeFromNib
{
// 1.单页的时候是否隐藏pageControl
self.pageControl.hidesForSinglePage = YES;
// 2.设置pageControl的图片
[self.pageControl setValue:[UIImage imageNamed:@"current"] forKeyPath:@"_currentPageImage"];
[self.pageControl setValue:[UIImage imageNamed:@"other"] forKeyPath: @"_pageImage"];
// 3.开启定时器
[self startTimer];
}
+ (instancetype)pageView
{
return [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil] lastObject];
}
- (void)setImageNames:(NSArray *)imageNames
{
_imageNames = imageNames;
// 0.移除之前添加的
// 让subviews这个数组中每一个对象都执行removeFromSuperview
[self.scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
// 1.根据图片名数据创建ImageView添加到scrollView
CGFloat scrollViewW = self.scrollView.frame.size.width;
CGFloat scrollViewH = self.scrollView.frame.size.height;
NSUInteger count = imageNames.count;
for (int i = 0; i < count; i ++) {
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = [UIImage imageNamed:imageNames[i]];
imageView.frame = CGRectMake(i * scrollViewW, 0, scrollViewW, scrollViewH);
[self.scrollView addSubview:imageView];
}
// 2.设置contentSize
self.scrollView.contentSize = CGSizeMake(count * scrollViewW, 0);
// 3.设置总页数
self.pageControl.numberOfPages = count;
}
#pragma mark - 定时器相关的代码
- (void)startTimer
{
// 返回一个自动执行的定时器对象
self.timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(nextPage:) userInfo:@"123" repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}
- (void)stopTimer
{
[self.timer invalidate];
}
/**
* 滚动到下一页
*/
- (void)nextPage:(NSTimer *)timer
{
// 1.计算下一页的页码
NSInteger page = self.pageControl.currentPage + 1;
// 2.超过了最后一页
if ( page == self.imageNames.count) {
page = 0;
}
// 3.滚动到下一页
[self.scrollView setContentOffset:CGPointMake(page * self.scrollView.frame.size.width, 0) animated:YES];
}
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// 1.计算页码
int page = (int)(scrollView.contentOffset.x / scrollView.frame.size.width + 0.5);
// 2.设置页码
self.pageControl.currentPage = page;
}
/**
* 用户即将开始拖拽scrollView时,停止定时器
*/
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self stopTimer];
}
/**
* 用户已经停止拖拽scrollView时,开启定时器
*/
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self startTimer];
}
@end
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原文地址：http://www.cnblogs.com/liuzhenjie/p/5453337.html
