#import <UIKit/UIKit.h>
@interface PJXScrollView : UIScrollView
-(void)setBannerImageArray:(NSArray*)imageArray;
-(void)addPageControl;
@end
#import "PJXScrollView.h"
#define SCROLL_VIEW_WIDTH self.bounds.size.width
#define SCROLL_VIEW_HEIGHT self.bounds.size.height
#define SCROLL_VIEW_Y self.bounds.origin.y
@interface PJXScrollView()<UIScrollViewDelegate>{
UIImageView *_leftImageView;
UIImageView *_centerImageView;
UIImageView *_rightImageView;
NSArray *_imageArray;
CGFloat willBeginContentOffsetX;
CGFloat willEndContentOffsetX;
CGFloat endContentOffsetX;
NSInteger _currentImageIndex;
UIPageControl *_pageControl;
}
@end
@implementation PJXScrollView
-(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self _initScrollViewStyle];
[self _createImageView];
}
return self;
}
-(void)_initScrollViewStyle{
//反弹效果
self.bounces = NO;
//设置滚动范围
self.contentSize = CGSizeMake(SCROLL_VIEW_WIDTH*3,SCROLL_VIEW_HEIGHT );
}
-(void)_createImageView
{
_leftImageView = [[UIImageView alloc]initWithFrame:CGRectMake(SCROLL_VIEW_WIDTH*0, 0, SCROLL_VIEW_WIDTH, SCROLL_VIEW_HEIGHT)];
[self addSubview:_leftImageView];
_centerImageView = [[UIImageView alloc]initWithFrame:CGRectMake(SCROLL_VIEW_WIDTH*1, 0, SCROLL_VIEW_WIDTH, SCROLL_VIEW_HEIGHT)];
[self addSubview:_centerImageView];
_rightImageView = [[UIImageView alloc]initWithFrame:CGRectMake(SCROLL_VIEW_WIDTH*2, 0, SCROLL_VIEW_WIDTH, SCROLL_VIEW_HEIGHT)];
[self addSubview:_rightImageView];
}
-(void)setBannerImageArray:(NSArray*)imageArray
{
_imageArray = imageArray;
_leftImageView.image = [UIImage imageNamed:_imageArray[0]];
_centerImageView.image = [UIImage imageNamed:_imageArray[1]];
_rightImageView.image = [UIImage imageNamed:_imageArray[2]];
}
//监听滚动
//手开始拖拽的时候调用,
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
willBeginContentOffsetX = scrollView.contentOffset.x;
}
-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{
willEndContentOffsetX = scrollView.contentOffset.x;
}
//停止滚动时调用
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
endContentOffsetX = scrollView.contentOffset.x;
//实现广告的循环播放
if(willEndContentOffsetX > endContentOffsetX &&
willEndContentOffsetX < willBeginContentOffsetX){
//画面从左往右移动
if (_currentImageIndex > 0) {
_currentImageIndex--;
}else{
_currentImageIndex = _imageArray.count -1;
}
}else if(willEndContentOffsetX < endContentOffsetX &&
willEndContentOffsetX > willBeginContentOffsetX){
//从右往左
if (_currentImageIndex < _imageArray.count-1) {
_currentImageIndex ++;
}else{
_currentImageIndex = 0;
}
}else{
}
//改变当前页码
_pageControl.currentPage = _currentImageIndex;
NSInteger leftPage = _currentImageIndex-1;
if (leftPage < 0) {
leftPage = _imageArray.count - 1;
}
NSInteger rightPage = _currentImageIndex + 1;
if (rightPage >= _imageArray.count-1) {
rightPage = 0;
}
//显示图片
_leftImageView.image = [UIImage imageNamed:_imageArray[leftPage]];
_centerImageView.image = [UIImage imageNamed:_imageArray[_currentImageIndex]];
_rightImageView.image = [UIImage imageNamed:_imageArray[rightPage]];
self.contentOffset = CGPointMake(SCROLL_VIEW_WIDTH, 0);
}
-(void)addPageControl{
_pageControl = [[UIPageControl alloc] init];
_pageControl.frame = CGRectMake(SCROLL_VIEW_WIDTH - 20*_imageArray.count, SCROLL_VIEW_Y+40, 20*_imageArray.count, 20);
//设置页码数
_pageControl.numberOfPages = _imageArray.count;
//设置当前页码数
_pageControl.currentPage = 0;
//设置能否能够点击
_pageControl.enabled = NO;
//设置颜色
_pageControl.pageIndicatorTintColor = [UIColor redColor];
_pageControl.currentPageIndicatorTintColor = [UIColor blueColor];
//绑定页码控件
[self performSelector:@selector(bindPageControl) withObject:nil afterDelay:0.1f];
}
-(void)bindPageControl{
[[self superview] addSubview:_pageControl];
}
@end
