iOS-使用SDCycleScrollView定制各种自定义样式

SDCycleScrollView的优点及实现技巧：

1.利用UICollectionView的复用机制，只会创建屏幕可见个cell。
2.如果是无限循环 ，会存在100*self.imagePathsGroup.count个item,第一次出现的位置在(100*self.imagePathsGroup.count)/2的位置。
3.每次滚动到100*self.imagePathsGroup.count位置的item自动切换到(100*self.imagePathsGroup.count)/2的位置。
4.使用取余index % self.imagePathsGroup.count确定现在显示的imageView

缺点：

手动拖拽到最后、不会跳到初始位置

原因：

因为作者设置的100足够大、未对拖拽最后一个item做处理

解决方法：

同时监听NSTimer和拖拽,在（100 - 1）*self.imagePathsGroup.count和self.imagePathsGroup.count位置时实现切换到(100*self.imagePathsGroup.count)/2的位置

使用SDCycleScrollView制作各种自定义样式的上下滚动的跑马灯

效果图：

image.png

.m

@interface ViewController () <SDCycleScrollViewDelegate>
@end
@implementation ViewController
{
    NSArray *_imagesURLStrings;
    SDCycleScrollView *_customCellScrollViewDemo;
}

- (void)customCellScrollView {

    // 如果要实现自定义cell的轮播图，必须先实现customCollectionViewCellClassForCycleScrollView:和 setupCustomCell:forIndex:代理方法
    
    _customCellScrollViewDemo = [SDCycleScrollView cycleScrollViewWithFrame:CGRectMake(0, 820, w, 40) delegate:self placeholderImage:[UIImage imageNamed:@"placeholder"]];
    _customCellScrollViewDemo.currentPageDotImage = [UIImage imageNamed:@"pageControlCurrentDot"];
    _customCellScrollViewDemo.pageDotImage = [UIImage imageNamed:@"pageControlDot"];
    _customCellScrollViewDemo.imageURLStringsGroup = imagesURLStrings;
    _customCellScrollViewDemo.scrollDirection = UICollectionViewScrollDirectionVertical;
    _customCellScrollViewDemo.showPageControl = NO;
    [demoContainerView addSubview:_customCellScrollViewDemo];
}

// 不需要自定义轮播cell的请忽略下面的代理方法

// 如果要实现自定义cell的轮播图，必须先实现customCollectionViewCellClassForCycleScrollView:和setupCustomCell:forIndex:代理方法
- (Class)customCollectionViewCellClassForCycleScrollView:(SDCycleScrollView *)view
{
    if (view != _customCellScrollViewDemo) {
        return nil;
    }
    return [CustomCollectionViewCell class];
}

- (void)setupCustomCell:(UICollectionViewCell *)cell forIndex:(NSInteger)index cycleScrollView:(SDCycleScrollView *)view
{
    CustomCollectionViewCell *myCell = (CustomCollectionViewCell *)cell;
    //[myCell.imageView sd_setImageWithURL:_imagesURLStrings[index]];
    
    NSArray *titleArray = @[@"新闻",
                            @"娱乐",
                            @"体育"];
    NSArray *contentArray = @[@"新闻新闻新闻新闻新闻新闻新闻新闻新闻新闻新闻新闻",
                              @"娱乐娱乐娱乐娱乐娱乐娱乐娱乐娱乐娱乐娱乐",
                              @"体育体育体育体育体育体育体育体育体育体育体育体育"];
    myCell.titleLabel.text = titleArray[index];
    myCell.contentLabel.text = contentArray[index];
}

自定义cell-根据不同的cell定制各种自定义样式的上下滚动的跑马灯

.h
#import <UIKit/UIKit.h>

@interface CustomCollectionViewCell : UICollectionViewCell

@property (nonatomic, strong) UIImageView *imageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *contentLabel;

@end
.m
#import "CustomCollectionViewCell.h"
#import "UIView+SDExtension.h"

@implementation CustomCollectionViewCell

#pragma mark - 懒加载
- (UIImageView *)imageView {
    if (!_imageView) {
        _imageView = [UIImageView new];
        _imageView.layer.borderColor = [[UIColor redColor] CGColor];
        _imageView.layer.borderWidth = 0;
        _imageView.hidden = YES;
    }
    return _imageView;
}
- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc]init];
        _titleLabel.text = @"新闻";
        _titleLabel.textColor = [UIColor redColor];
        _titleLabel.numberOfLines = 0;
        _titleLabel.textAlignment = NSTextAlignmentCenter;
        _titleLabel.font = [UIFont systemFontOfSize:12];
        _titleLabel.backgroundColor = [UIColor yellowColor];
        _titleLabel.layer.masksToBounds = YES;
        _titleLabel.layer.cornerRadius = 5;
        _titleLabel.layer.borderColor = [UIColor redColor].CGColor;
        _titleLabel.layer.borderWidth = 1.f;
    }
    return _titleLabel;
}
- (UILabel *)contentLabel {
    if (!_contentLabel) {
        _contentLabel = [[UILabel alloc]init];
        _contentLabel.text = @"我是label的内容";
        _contentLabel.textColor = [UIColor blackColor];
        _contentLabel.numberOfLines = 0;
        _contentLabel.font = [UIFont systemFontOfSize:12];
    }
    return _contentLabel;
}
#pragma mark - 页面初始化
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.contentView.backgroundColor = [UIColor whiteColor];
        [self setupViews];
    }
    return self;
}

#pragma mark - 添加子控件
- (void)setupViews {
    [self.contentView addSubview:self.imageView];
    [self.contentView addSubview:self.titleLabel];
    [self.contentView addSubview:self.contentLabel];
}

#pragma mark - 布局子控件
- (void)layoutSubviews {
    [super layoutSubviews];
    _imageView.frame = self.bounds;
    _titleLabel.frame = CGRectMake(15, 10, 45, 20);
    _contentLabel.frame = CGRectMake(15 + 45 + 15, 10, 200, 20);
}

实际情况自己可下载SDCycleScrollView自行研究。。。