轮番图

墨蓝 2022-08-09 18:31 147阅读 0赞

\- (void)viewDidLoad \{  
    \[super viewDidLoad\];

// Do any additional setup after loading the view.

\[self addScroll\];  
    \[self addImageView\];

\[self loadImages\];  
    \[self addPageControl\];  
    \[self setDefaultImage\];//加载默认图片

\-(void)loadImages\{  
    self.imagesAry=\[\[NSMutableArray alloc\] init\];  
    for (HomeADSlide\_listModel \*model in self.ary) \{  
        NSString \*img\_url=model.img\_url;  
        \[self.imagesAry addObject:img\_url\];  
    \}  
\}  
  
\-(void)addScroll\{  
    self.scrollView=\[\[UIScrollView alloc\] initWithFrame:CGRectMake(0, 0, kScreenSize.width, kScreenSize.height/3.79)\];  
    \[self.contentView addSubview:self.scrollView\];  
    self.scrollView.delegate=self;//设置代理  
    self.scrollView.contentSize=CGSizeMake(3\*kScreenSize.width, 0);//设置滚动范围  
    \[self.scrollView setContentOffset:CGPointMake(kScreenSize.width, 0) animated:NO\];//设置当前显示的位置为中间图片  
    self.scrollView.pagingEnabled=YES;  
    self.scrollView.showsHorizontalScrollIndicator=NO;  
    self.timer = \[NSTimer scheduledTimerWithTimeInterval:3.0f target:self selector:@selector(update:) userInfo:nil repeats:YES\];  
    //  将定时器添加到主线程  
    \[\[NSRunLoop mainRunLoop\] addTimer:self.timer forMode:NSRunLoopCommonModes\];  
\}  
  
\- (void)update:(NSTimer \*)timer\{  
    if (\_isDragging == YES) \{  
        return ;  
    \}  
    CGPoint offSet = self.scrollView.contentOffset;  
    offSet.x +=offSet.x;  
    \[self.scrollView setContentOffset:offSet animated:YES\];  
    if (offSet.x >= kScreenSize.width \*2) \{  
        offSet.x = kScreenSize.width;  
    \}  
\}  
  
\-(void)addImageView\{  
    CGRect frame=self.scrollView.frame;  
    self.leftImageView=\[\[UIImageView alloc\] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)\];  
    self.centerImageView=\[\[UIImageView alloc\] initWithFrame:CGRectMake(frame.size.width, 0, frame.size.width, frame.size.height)\];  
    self.rightImageView=\[\[UIImageView alloc\] initWithFrame:CGRectMake(2\*frame.size.width, 0, frame.size.width, frame.size.height)\];  
      
    self.leftImageView.userInteractionEnabled=YES;  
    self.centerImageView.userInteractionEnabled=YES;  
    self.rightImageView.userInteractionEnabled=YES;  
      
    UITapGestureRecognizer \*leftTap=\[\[UITapGestureRecognizer alloc\] initWithTarget:self action:@selector(tap)\];  
    UITapGestureRecognizer \*centerTap=\[\[UITapGestureRecognizer alloc\] initWithTarget:self action:@selector(tap)\];  
    UITapGestureRecognizer \*rightTap=\[\[UITapGestureRecognizer alloc\] initWithTarget:self action:@selector(tap)\];  
    \[self.leftImageView addGestureRecognizer:leftTap\];  
    \[self.centerImageView addGestureRecognizer:centerTap\];  
    \[self.rightImageView addGestureRecognizer:rightTap\];  
      
    \[self.scrollView addSubview:self.leftImageView\];  
    \[self.scrollView addSubview:self.centerImageView\];  
    \[self.scrollView addSubview:self.rightImageView\];  
\}  
\-(void)tap\{//每张图片的点击事件

//self.currentImageIndex;  
   
\}  
  
\-(void)addPageControl\{  
    self.pageControl=\[\[UIPageControl alloc\] init\];  
    //注意：此方法可以根据页数返回UIPageControl合适的大小  
    CGSize size=\[self.pageControl sizeForNumberOfPages:self.ary.count\];  
    self.pageControl.bounds=CGRectMake(0, 0, size.width, size.height);  
    self.pageControl.center=CGPointMake(kScreenSize.width-(kScreenSize.width/7.0), self.scrollView.frame.size.height-15);  
    //self.pageControl.center=CGPointMake(100,100);  
    self.pageControl.pageIndicatorTintColor=\[UIColor darkGrayColor\];  
    self.pageControl.currentPageIndicatorTintColor=kUIColorFromRGB(0xb2151c);//设置颜色  
    self.pageControl.numberOfPages=self.ary.count;//设置总页数  
    \[self.superview addSubview:self.pageControl\];  
\}  
  
\-(void)setDefaultImage\{  
    //加载默认图片  
    \[self.leftImageView sd\_setImageWithURL:self.imagesAry\[self.imageCount-1\] placeholderImage:nil\];  
    \[self.centerImageView sd\_setImageWithURL:self.imagesAry\[0\] placeholderImage:nil\];  
    \[self.rightImageView sd\_setImageWithURL:self.imagesAry\[1\] placeholderImage:nil\];  
    self.currentImageIndex=0;  
    //设置当前页  
    self.pageControl.currentPage=self.currentImageIndex;  
\}  
  
\#pragma mark - scrollViewDelegate  
\-(void)scrollViewWillBeginDragging:(UIScrollView \*)scrollView\{  
    \_isDragging = YES;  
\}  
  
//滚动停止事件  
\-(void)scrollViewDidEndDecelerating:(UIScrollView \*)scrollView\{  
    //    \[self reloadImage\];//重新加载图片  
    \_isDragging = NO;  
\}  
  
\- (void) scrollViewDidScroll:(UIScrollView \*)scrollView\{  
    static int i =1; //   当前展示的是第几张图片  
    float offset = self.scrollView.contentOffset.x;  
    if (self.rightImageView.image == nil || self.leftImageView.image == nil) \{  
        //  加载下一个视图  
        i == self.imageCount-1 ? 0 : i+1;  
        \[self.rightImageView sd\_setImageWithURL:\[NSURL URLWithString:self.imagesAry\[i\]\]\];  
        // 加载上一个视图  
        i==0 ? self.imageCount-1 :i-1;  
        \[\_leftImageView sd\_setImageWithURL:\[NSURL URLWithString:self.imagesAry\[i\]\]\];  
    \}  
    if(offset ==0)\{  
        \_centerImageView.image = \_leftImageView.image;  
        scrollView.contentOffset = CGPointMake(scrollView.bounds.size.width, 0);  
        \_leftImageView.image = nil;  
        if (i == 0) \{  
            i=self.imageCount-1;  
        \} else\{  
            i-=1;  
        \}  
    \}  
    if (offset == scrollView.bounds.size.width \* 2) \{  
        \_centerImageView.image = \_rightImageView.image;  
        scrollView.contentOffset = CGPointMake(scrollView.bounds.size.width, 0);  
        \_rightImageView.image = nil;  
        if (i == self.imageCount-1) \{  
            i=0;  
        \}else\{  
            i+=1 ;  
        \}  
    \}  
    if (i==0) \{  
        self.currentImageIndex=self.imageCount-1;  
    \} else \{  
        self.currentImageIndex=i-1;  
    \}  
    self.pageControl.currentPage=self.currentImageIndex;//设置分页  
\}