三个ImageView 实现无线轮播 方法

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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {     //开始滚动，判断位置，然后替换复用的三张图     [self changeImageWithOffset:scrollView.contentOffset.x]; }   - (void)changeImageWithOffset:(CGFloat)offsetX {     if (offsetX >= ScrollWidth * 2)     {         _currentIndex++;                   if (_currentIndex == _MaxImageCount-1)         {             [self changeImageLeft:_currentIndex-1 center:_currentIndex right:0];                       }else if (_currentIndex == _MaxImageCount)         {                           _currentIndex = 0;                           [self changeImageLeft:_MaxImageCount-1 center:0 right:1];                       }else         {             [self changeImageLeft:_currentIndex-1 center:_currentIndex right:_currentIndex+1];         }         _PageControl.currentPage = _currentIndex;               }           if (offsetX <= 0)     {         _currentIndex--;                   if (_currentIndex == 0) {                           [self changeImageLeft:_MaxImageCount-1 center:0 right:1];                       }else if (_currentIndex == -1) {                           _currentIndex = _MaxImageCount-1;             [self changeImageLeft:_currentIndex-1 center:_currentIndex right:0];                       }else {             [self changeImageLeft:_currentIndex-1 center:_currentIndex right:_currentIndex+1];         }                   _PageControl.currentPage = _currentIndex;     } }

 

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#pragma mark - 给复用的imageView赋值   - (void)changeImageLeft:(NSInteger)LeftIndex center:(NSInteger)centerIndex right:(NSInteger)rightIndex {     if (_isNetworkImage)     {                   [_leftImageView sd_setImageWithURL:[NSURL URLWithString:_imageArray[LeftIndex]] placeholderImage:_placeholderImage];         [_centerImageView sd_setImageWithURL:[NSURL URLWithString:_imageArray[centerIndex]] placeholderImage:_placeholderImage];         [_rightImageView sd_setImageWithURL:[NSURL URLWithString:_imageArray[rightIndex]] placeholderImage:_placeholderImage];               }else     {         _leftImageView.image = _imageArray[LeftIndex];         _centerImageView.image = _imageArray[centerIndex];         _rightImageView.image = _imageArray[rightIndex];     }           [_scrollView setContentOffset:CGPointMake(ScrollWidth, 0)]; }