wodeshebao-iOS/我的社保/Home/HomeView/SPSBAdvertisementBannerScrollView.m

//
//  SPSBAdvertisementBannerScrollView.m
//  我的社保
//
//  Created by shanp on 2021/5/10.
//

#import "SPSBAdvertisementBannerScrollView.h"
#import "SPSBUIGeneralHeader.h"

@interface SPSBAdvertisementBannerScrollView ()<UIScrollViewDelegate> {
    NSInteger _pageCount;
    NSArray<UIImage *> *_imageArray;
    
    UIView *_pageControlView;
    UIView *_pageControlFlag;
    
    CGFloat _scrollViewWidth;
    
    UIScrollView *_imageScrollView;
    NSTimer *_timer;
}

@end

#define leadingInterval 16

@implementation SPSBAdvertisementBannerScrollView

- (instancetype)init {
    self = [super init];
    if (!self) return nil;
    _pageCount = 0;
    _scrollViewWidth = jxh_screenWidth() - leadingInterval * 2;
    [self addImageView];
    [self addPageControl];
    [self addTimer];
    _imageScrollView.contentOffset = CGPointMake(_scrollViewWidth, _imageScrollView.contentOffset.y);
    return self;
}

- (void)addImageView {
    if (_imageScrollView) [_imageScrollView removeFromSuperview];
    if (_pageCount == 0) return;
    UIImage *image = _imageArray[0];
    _spsb_height = _scrollViewWidth * (image.size.height / image.size.width);
    
    _imageScrollView = [UIScrollView convenienceWithBackgroundColor:spsb_FFFFFF_color(1.f)];
    _imageScrollView.scrollsToTop = false;
    _imageScrollView.delegate = self;
    _imageScrollView.pagingEnabled = true;
    [self addSubview:_imageScrollView];
    //添加显示的图片
    for (NSInteger i = 1; i < _pageCount + 1; i ++) {
        UIImageView *imageView = UIImageView.new;
        imageView.contentMode = UIViewContentModeScaleAspectFill;
        imageView.clipsToBounds = true;
        imageView.tag = 2000 + i;
        imageView.backgroundColor = [UIColor whiteColor];
        if (_imageArray && _imageArray.count > i - 1) {
            imageView.image = _imageArray[i - 1];
        }
        [_imageScrollView addSubview:imageView];
        if (i == _pageCount) {
            [imageView makeConstraints:^(JXHConstraintMaker *make) {
                make.leading.equalTo(i * self->_scrollViewWidth);
                make.top.equalTo(0);
                make.size.equalTo(CGSizeMake(self->_scrollViewWidth, self->_spsb_height));
                make.trailing.equalTo(-self->_scrollViewWidth);
            }];
        } else {
            [imageView makeConstraints:^(JXHConstraintMaker *make) {
                make.leading.equalTo(i * self->_scrollViewWidth);
                make.top.equalTo(0);
                make.size.equalTo(CGSizeMake(self->_scrollViewWidth, self->_spsb_height));
            }];
        }
        imageView.userInteractionEnabled = true;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
        [imageView addGestureRecognizer:tap];
        
    }
    //添加循环用得图片
    for (NSInteger i = 0; i < 2; i ++) {
        UIImageView *imageView = [[UIImageView alloc] init];
        imageView.contentMode = UIViewContentModeScaleAspectFill;
        imageView.backgroundColor = [UIColor whiteColor];
        imageView.clipsToBounds = true;
        if (_imageArray && _imageArray.count > i * (_pageCount - 1)) {
            imageView.image = _imageArray[i * (_pageCount - 1)];
        }
        [_imageScrollView addSubview:imageView];
        [imageView makeConstraints:^(JXHConstraintMaker *make) {
            make.leading.equalTo((1 - i) * (self->_pageCount + 1) * self->_scrollViewWidth);
            make.top.equalTo(0);
            make.size.equalTo(CGSizeMake(self->_scrollViewWidth, self->_spsb_height));
        }];
    }
    if (_pageCount == 1) {
        _imageScrollView.scrollEnabled = false;
    }
    [_imageScrollView makeConstraints:^(JXHConstraintMaker *make) {
        make.edges.equalTo(self);
        make.size.equalTo(CGSizeMake(self->_scrollViewWidth, self->_spsb_height));
    }];
    _imageScrollView.contentSize = CGSizeMake(_scrollViewWidth * (_pageCount + 2), self->_spsb_height);
}

- (void)tapAction:(UIGestureRecognizer *)sender {
    [self.spsb_advertisementViewDelegate advertisementView:self selectImageWithIndex:sender.view.tag - 2001];
}

- (void)addPageControl {
    if (_pageControlView) {
        [_pageControlView removeFromSuperview];
        _pageControlView = nil;
    }
    if (_pageCount < 2) return;
    _pageControlView = [[UIView alloc] init];
    [self addSubview:_pageControlView];
    [_pageControlView makeConstraints:^(JXHConstraintMaker *make) {
        make.bottom.equalTo(-8);
        make.centerX.equalTo(self);
    }];
    UIView *tempView = nil;
    for (NSInteger i = 0; i < _pageCount; i ++) {
        UIView *view = [[UIView alloc] init];
        view.backgroundColor = [UIColor colorWithWhite:1 alpha:0.7];
        view.tag = 3000 + i;
        [_pageControlView addSubview:view];
        [view makeConstraints:^(JXHConstraintMaker *make) {
            make.top.and.bottom.equalTo(0);
            if (tempView) {
                make.leading.equalTo(tempView.trailing).offset(8);
            } else {
                make.leading.equalTo(0);
            }
            make.size.equalTo(CGSizeMake(4, 3));
        }];
        
        tempView = view;
    }

    [tempView makeConstraints:^(JXHConstraintMaker *make) {
        make.trailing.equalTo(0);
    }];
    
    _pageControlFlag = [[UIView alloc] init];
    _pageControlFlag.backgroundColor = [UIColor whiteColor];
    [_pageControlView addSubview:_pageControlFlag];
    [_pageControlFlag makeConstraints:^(JXHConstraintMaker *make) {
        make.top.equalTo(0);
        make.centerX.equalTo([self->_pageControlView viewWithTag:3000]);
        make.size.equalTo(CGSizeMake(10, 3));
    }];
}

- (void)setControlViewIndex:(NSInteger)index {
    if (index >= _pageCount) return;
    [_pageControlFlag remakeConstraints:^(JXHConstraintMaker *make) {
        make.top.equalTo(0);
        make.centerX.equalTo([self->_pageControlView viewWithTag:3000 + index]);
        make.size.equalTo(CGSizeMake(10, 3));
    }];
    [UIView animateWithDuration:0.3 animations:^{
        [self->_pageControlView layoutSubviews];
    }];
}

- (void)reloadDataWithArray:(NSArray<UIImage *> *)array {
    _imageArray = array;
    _pageCount = array.count;
    NSInteger temp = _imageScrollView.contentOffset.x / _scrollViewWidth;
    [self addImageView];
    [self addPageControl];
    if (array.count == 0) return;
    if (temp > _pageCount) temp = _pageCount;
    if (temp == 0) temp = 1;
    _imageScrollView.contentOffset = CGPointMake(temp * _scrollViewWidth, _imageScrollView.contentOffset.y);
    
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    [_timer invalidate];
    _timer = nil;
}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
    [self addTimer];
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (_pageCount > 1) {
        if (scrollView.contentOffset.x >= _scrollViewWidth * (_pageCount + 1)) {
            scrollView.contentOffset = CGPointMake(_scrollViewWidth, scrollView.contentOffset.y);
        } else if (scrollView.contentOffset.x <= 0) {
            scrollView.contentOffset = CGPointMake(_scrollViewWidth * _pageCount, scrollView.contentOffset.y);
        }
    }
    if (_pageControlView) {
        [self setControlViewIndex: scrollView.contentOffset.x / _scrollViewWidth - 1];
    }
}

- (void)addTimer {
    _timer = [NSTimer scheduledTimerWithTimeInterval:6 target:self selector:@selector(circulateToScroll) userInfo:nil repeats:true];
}

- (void)circulateToScroll {
    if (_pageCount < 2) return;
    [UIView animateWithDuration:0.5 animations:^{
        self->_imageScrollView.contentOffset = CGPointMake(self->_imageScrollView.contentOffset.x + self->_scrollViewWidth - 1, self->_imageScrollView.contentOffset.y);
    } completion:^(BOOL finished) {
        NSInteger inter = self->_imageScrollView.contentOffset.x / self->_scrollViewWidth;
        CGFloat cgfloat = self->_imageScrollView.contentOffset.x / self->_scrollViewWidth;
        self->_imageScrollView.contentOffset = CGPointMake(cgfloat == inter ? self->_imageScrollView.contentOffset.x : self->_scrollViewWidth * (inter + 1), self->_imageScrollView.contentOffset.y);
    }];
}

- (void)dealloc {
    [_timer invalidate];
    _timer = nil;
}

@end

#undef leadingInterval