scrollView封装广告轮播示例代码

最新推荐文章于 2025-09-08 14:45:35 发布

转载最新推荐文章于 2025-09-08 14:45:35 发布 · 115 阅读

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原文链接：http://www.cnblogs.com/PJXWang/p/5898798.html

本文详细介绍了一种自定义的轮播图组件PJXScrollView的实现过程，该组件使用Objective-C编写，适用于iOS平台。文章深入讲解了如何通过UIScrollView创建并管理轮播图的图片显示，包括图片的加载、切换和循环播放功能。此外，还介绍了如何添加UIPageControl来指示当前页面的位置。

#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

转载于:https://www.cnblogs.com/PJXWang/p/5898798.html