第四篇、图片轮播查看器

简介：

　　这是一个图片轮播查看器，代码还需要进一步的封装。

使用：

PictureCircle *APictureCircle = [[PictureCircle alloc]initWithFrame:CGRectMake(0, 0, KScreenWidth, 120) array:Array];
 APictureCircle.delegate =self;
 [self.FPictureCircleView addSubview:APictureCircle];

实现：

#import <UIKit/UIKit.h>



@protocol PictureCircleDelegate <NSObject>

- (void)TouchIndex:(NSInteger)AInteger;

@end

@interface PictureCircle : UIView<DownloadDelete>

@property (nonatomic, strong) UIScrollView * picScrollView; // 轮播图

@property (nonatomic, strong) UIPageControl * pageControl; // 显示条

@property (nonatomic, strong) NSTimer * timer; // 定时器

@property (nonatomic, assign) NSInteger totalPicCount; // 总共多少个图片

- (id)initWithFrame:(CGRect)frame array:(NSMutableArray *)picArray; // 根据传入数组来初始化此view

@property (weak,nonatomic) id<PictureCircleDelegate>delegate;

@end

#import "PictureCircle.h"


@interface PictureCircle ()<UIScrollViewDelegate>

@property (nonatomic, strong) NSMutableArray * dataArray;
@property (nonatomic, assign) NSInteger currentPageIndex;
@property (strong,nonatomic) NSMutableDictionary *FImageViewDictionary;

- (void)addTimer; // 添加定时器
- (void)removeTimer; // 移除定时器

@end

@implementation PictureCircle

- (id)initWithFrame:(CGRect)frame array:(NSMutableArray *)picArray
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setupScrollViewWithArray:picArray];
    }
    return self;
}

- (void)setupScrollViewWithArray:(NSMutableArray *)picArray
{
    // 图片的宽高和起始坐标
    CGFloat imageW = KScreenWidth;
    CGFloat imageH = self.frame.size.height;
    CGFloat imageY = 0;
    // 图片数
    
    if (![picArray count]) {
        return;
    }
    self.dataArray = [NSMutableArray  arrayWithArray:picArray];
    [self.dataArray insertObject:[picArray objectAtIndex:(picArray.count - 1)] atIndex:0];
    [self.dataArray addObject:[picArray objectAtIndex:0]];
    
    NSInteger totalCount = self.dataArray.count;
    self.totalPicCount = totalCount;

    // 轮播图
    UIScrollView * tempScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, imageW, imageH)];
    tempScrollView.showsHorizontalScrollIndicator = NO;
    tempScrollView.showsVerticalScrollIndicator = NO;
    self.picScrollView = tempScrollView;
    
    // 添加图片
    for (int i = 0; i < totalCount; i ++)
    {
        UIImageView * tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(imageW * i, imageY, imageW, imageH)];
        
        if (!self.FImageViewDictionary) {
            self.FImageViewDictionary = [[NSMutableDictionary alloc]init];
        }
        [self.FImageViewDictionary setObject:tempImageView forKey:[NSString stringWithFormat:@"%d",i]];
        
        
        tempImageView.tag = i;
        [tempImageView setUserInteractionEnabled:YES];
        // 设置图片
        NSString * tempString1 = [[self.dataArray objectAtIndex:i] objectForKey:@"feature_img"];
        // 添加点击手势
        UITapGestureRecognizer *ASingTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(SingTap:)];
        [tempImageView addGestureRecognizer:ASingTap];
        
        
        [self.picScrollView addSubview:tempImageView];
    }
    
    // 设置scrollView的滚动范围
    self.picScrollView.contentSize = CGSizeMake(totalCount * imageW, 0);
    self.picScrollView.contentOffset = CGPointMake(KScreenWidth, 0);
    
    // 设置分页
    self.picScrollView.pagingEnabled = YES;
    // 监听scrollView的滚动
    self.picScrollView.delegate = self;
    [self.picScrollView setScrollEnabled:YES];
    self.picScrollView.bounces = NO;
    
    // 设置小圆点的起始位置
    CGFloat APageControlX = KScreenWidth -30 - totalCount * 6;
    self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(APageControlX, imageH -20, 25, 20)];
    
    self.pageControl.numberOfPages = totalCount - 2;
    self.pageControl.currentPage = 0;
    [self addSubview:self.picScrollView];
    [self addSubview:self.pageControl];
    
    if(1 == [picArray count])
    {
        [self.pageControl setHidden:YES];
        [self.picScrollView setScrollEnabled:NO];
        
    }
    else
    {
        [self addTimer];
    }
    
}

// 单击手势监听
- (void)SingTap:(UITapGestureRecognizer *)ATapGestureRecognizer
{
    [self.delegate TouchIndex:ATapGestureRecognizer.view.tag-1];
    
}

- (void)addTimer
{
    self.timer = [NSTimer scheduledTimerWithTimeInterval:5.0f target:self selector:@selector(nextImage) userInfo:nil repeats:YES];
}

- (void)removeTimer
{
    [self.timer invalidate];
}

// 播放下一张图片
- (void)nextImage
{
    // 设置滚动
    CGFloat scollViewW = self.picScrollView.frame.size.width;
    
    CGFloat offsetX = self.picScrollView.contentOffset.x;
    int page = floor((offsetX - scollViewW / 2) / scollViewW) + 1;
    self.currentPageIndex = page + 1;
    
    if (self.currentPageIndex > 0 && self.currentPageIndex < self.dataArray.count) {
        // 滚动scrollView
        CGFloat x = self.currentPageIndex * self.picScrollView.frame.size.width;
        
        [UIView animateWithDuration:0.2 animations:^{
            self.picScrollView.contentOffset = CGPointMake(x, 0);
        }];
        
        if (self.currentPageIndex == self.dataArray.count - 1) {
            self.currentPageIndex ++;
        }
        
    }
    
    if (self.currentPageIndex == self.dataArray.count) {
        [_picScrollView setContentOffset:CGPointMake(KScreenWidth, 0)];
    }
    
    if (self.currentPageIndex == 0) {
        [_picScrollView setContentOffset:CGPointMake((self.dataArray.count - 2) * KScreenWidth, 0)];
    }
    
}

#pragma mark - scrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    CGFloat scollViewW = self.picScrollView.frame.size.width;
    CGFloat offsetX = self.picScrollView.contentOffset.x;
    int page = floor((offsetX - scollViewW / 2) / scollViewW) + 1;
    self.currentPageIndex = page;
    self.pageControl.currentPage = page - 1;
    
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [self removeTimer];
    self.timer = nil;
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    [self addTimer];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    if (self.currentPageIndex == 0) {
        [_picScrollView setContentOffset:CGPointMake((self.dataArray.count - 2) * KScreenWidth, 0)];
    }
    
    if (self.currentPageIndex == (self.dataArray.count - 1)) {
        [_picScrollView setContentOffset:CGPointMake(KScreenWidth, 0)];
    }
}

- (void)dealloc
{
    [self removeTimer];
    self.timer = nil;
}

@end