标签:赋值 integer offset array cgpoint objc UI current highlight
- (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; } }
#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)]; }
标签:赋值 integer offset array cgpoint objc UI current highlight
原文地址:http://www.cnblogs.com/mkai/p/6404635.html