如題是這樣的我想達到的效果是往下滑的過程中,例如下圖
认证高级PHP讲师
你說的是卡片佈局吧, 用UICollectionView和自訂UICollectionViewFlowLayout就可以實現, Demo地址
// 修改cell滑动时大小 - (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect { NSArray *attrs = [[NSArray alloc] initWithArray:[super layoutAttributesForElementsInRect:self.collectionView.bounds] copyItems:YES]; CGFloat scale; CGFloat offset; for (UICollectionViewLayoutAttributes *attr in attrs) { // 设置collection在滑动时, cell的大小 if (self.scrollDirection == UICollectionViewScrollDirectionHorizontal) { offset = fabs(attr.center.x - self.collectionView.contentOffset.x - self.collectionView.bounds.size.width * 0.5); scale = 1 - offset / (self.collectionView.bounds.size.width * 0.5) * 0.25; attr.transform = CGAffineTransformMakeScale(scale, scale); } else { offset = fabs(attr.center.y - self.collectionView.contentOffset.y - self.collectionView.bounds.size.height * 0.5); scale = 1 - offset / (self.collectionView.bounds.size.height * 0.5) * 0.25; } attr.transform = CGAffineTransformMakeScale(scale, scale); } return attrs; } // 返回collection滑动手指松开后, collection最终的contentOffset - (CGPoint)targetContentOffsetForProposedContentOffset:(CGPoint)proposedContentOffset withScrollingVelocity:(CGPoint)velocity { if (self.scrollDirection == UICollectionViewScrollDirectionHorizontal) { // cell 宽度 CGFloat itemW = self.itemSize.width; // cell边框距离(未设置collection的contentInset, 默认为0) CGFloat margin = self.collectionView.contentInset.left; // collection在手指松开后,collection滑动到停止时, collectioncontentOffset CGFloat index = roundf((proposedContentOffset.x + margin) / itemW); // 修改collection最终的contentOffset, 使collection滑动到cell中间 proposedContentOffset.x = index * self.collectionView.bounds.size.width - (index + 1) * margin; } else { CGFloat itemH = self.itemSize.height; CGFloat margin = self.collectionView.contentInset.top; CGFloat index = roundf((proposedContentOffset.y + margin) / itemH); proposedContentOffset.y = index * self.collectionView.bounds.size.height - (index+1) * margin; } return proposedContentOffset; }
你說的是卡片佈局吧, 用UICollectionView和自訂UICollectionViewFlowLayout就可以實現, Demo地址