- (void)scrollViewDidScroll:(UIScrollView *)scrollView {//開始滾動，判斷位置，然后替換復用的三張圖[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 - 給復用的imageView賦值- (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)]; }

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轉載于:https://www.cnblogs.com/mkai/p/6404635.html

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