NSArray *images = @[@"闻喜县交警队测速仪采购项目 再次竞争性谈判公告",@"我要展现给用户的内容放在scrollview中",@"让内容从上到底自动滚动，我最开始用的是DDAutoscrollview",@"如果需要开场动画的效果，在scrollView的viewcontroller实现"];
_scyleSV = [[HU_ScycleScrollView alloc]initWithFrame:CGRectMake(0, 80, self.view.bounds.size.width, 44)];
_scyleSV.backgroundColor = [UIColor redColor];
_scyleSV.titles = images;
_scyleSV.userInteractionEnabled = YES;
_scyleSV.delegate = self;
[self.view addSubview:_scyleSV];
#pragma mark ScyleScrollViewDelegate
- (void)scyleScrollView:(HU_ScycleScrollView *)scyleView index:(NSInteger)index{
NSLog(@"----- %ld",index);
}
HU_ScycleScrollView.h
typedef NS_ENUM(NSInteger, pageControlAligment){ pageControlAligmentCenter = 0, pageControlAligmentLeft};@class HU_ScycleScrollView;@protocol ScyleScrollViewDelegate- (void)scyleScrollView:(HU_ScycleScrollView *)scyleView index:(NSInteger)index;@end@interface HU_ScycleScrollView : UIView/** 标题数组 */@property (nonatomic,strong)NSArray *titles;/** 协议 */@property (nonatomic,assign)iddelegate;
HU_ScycleScrollView.m
#define SCYLE_WIDTH CGRectGetWidth(self.frame)#define SCYLE_HEIGHT CGRectGetHeight(self.frame)@interface HU_ScycleScrollView()/** 延迟时间 */
@property (nonatomic,assign)NSTimeInterval intervalTime;
/** 滑动视图 */
@property (nonatomic,strong)UIScrollView *scrollView;
/** 延时器 */
@property (nonatomic,strong)NSTimer *delayTimer;
/** 目前标题 */
@property (nonatomic,strong)UILabel *currentTitleView;
/** 目前标题位置 */
@property (nonatomic,assign)NSInteger currentTitIndex;
/** 下一个标题 */
@property (nonatomic,strong)UILabel *nextTitleView;
/** 下一个标题的位置 */
@property (nonatomic,assign)NSInteger nextTitIndex;
@end
@implementation HU_ScycleScrollView
#pragma mark 初始化
- (instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {
self.intervalTime = 3;
[self setupScycleView];
}
return self;
}
#pragma mark 创建视图
- (void)setupScycleView{
//添加scrollView
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:self.bounds];
scrollView.pagingEnabled = YES;
scrollView.scrollEnabled = YES;
scrollView.userInteractionEnabled = NO;
scrollView.bounces = NO;
scrollView.delegate = self;
scrollView.contentSize = CGSizeMake(SCYLE_WIDTH, SCYLE_HEIGHT * 2);
scrollView.contentOffset = CGPointMake(0, 0);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
[self addSubview:scrollView];
self.scrollView = scrollView;
//创建3个UILabel
[self setupThreeTitleView];
}
- (void)setupThreeTitleView{
//目前标题
UILabel *currentTitleView = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, SCYLE_WIDTH, SCYLE_HEIGHT)];
currentTitleView.userInteractionEnabled = YES;
[self.scrollView addSubview:currentTitleView];
self.currentTitleView = currentTitleView;
//给目前标题添加手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(clickTheCurrentImgAction:)];
[self addGestureRecognizer:tap];
//下一个标题
UILabel *nextTitleView = [[UILabel alloc]initWithFrame:CGRectMake(0, SCYLE_HEIGHT, SCYLE_WIDTH, SCYLE_HEIGHT)];
[self.scrollView addSubview:nextTitleView];
self.nextTitleView = nextTitleView;
}
- (void)setTitles:(NSArray *)titles{
_titles = titles;
//创建延时器
[self renewSetDelayTimer];
//更新图片位置
[self updateScycelScrollViewTitleIndex];
}
#pragma mark 更新图片位置
- (void)updateScycelScrollViewTitleIndex{
if (self.titles.count > 0) {
[self addTheTitleUrlStr:self.titles[self.currentTitIndex] titleView:_currentTitleView];
[self addTheTitleUrlStr:self.titles[self.nextTitIndex] titleView:_nextTitleView];
}
}
#pragma mark 解析图片并添加到imageView上
- (void)addTheTitleUrlStr:(NSString *)title titleView:(UILabel *)titleView{
titleView.text = title;
}
#pragma mark 延时器执行方法
- (void)useTimerIntervalUpdateScrollViewContentOffSet:(NSTimer *)timer{
[_scrollView setContentOffset:CGPointMake(0, SCYLE_HEIGHT) animated:YES];
}
#pragma mark 点击图片执行方法
- (void)clickTheCurrentImgAction:(UITapGestureRecognizer *)tap{
if ([_delegate respondsToSelector:@selector(scyleScrollView:index:)]) {
[self.delegate scyleScrollView:self index:_currentTitIndex];
}
}
#pragma mark 滑动结束时停止动画
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
[self scrollViewDidEndDecelerating:scrollView];
}
#pragma mark 减速滑动时
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
int offSet = floor(scrollView.contentOffset.y);
if (offSet == SCYLE_HEIGHT){
self.currentTitIndex = self.nextTitIndex;
}
//更新标题位置
[self updateScycelScrollViewTitleIndex];
//设置偏移量
scrollView.contentOffset = CGPointMake(0, 0);
}
#pragma mark 重新设置延时器
- (void)renewSetDelayTimer{
//添加延迟器
self.delayTimer = [NSTimer scheduledTimerWithTimeInterval:self.intervalTime target:self selector:@selector(useTimerIntervalUpdateScrollViewContentOffSet:) userInfo:nil repeats:YES];
//加入事件循环中
[[NSRunLoop mainRunLoop] addTimer:self.delayTimer forMode:NSRunLoopCommonModes];
}
//上一个标题位置
- (NSUInteger)beforeTitIndex{
if (self.currentTitIndex == 0) {
return self.titles.count - 1;
}else{
return self.currentTitIndex - 1;
}
}
//下一个标题的位置
- (NSInteger)nextTitIndex{
if (self.currentTitIndex < (self.titles.count - 1)) {
return self.currentTitIndex + 1;
}else{
return 0;
}
}