ios tableCell 内嵌 collectionview

通过重写 - (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize

withHorizontalFittingPriority:(UILayoutPriority)horizontalFittingPriority

verticalFittingPriority:(UILayoutPriority)verticalFittingPriority 方法

cell是通过systemLayoutSizeFittingSize方法获取contentView高度，然后加上分割线高度得到cell的高度，因此重写此方法返回真实高度应该是最有效的

- (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize withHorizontalFittingPriority:(UILayoutPriority)horizontalFittingPriority verticalFittingPriority:(UILayoutPriority)verticalFittingPriority

{

// 先对bgview进行布局,这里需对bgView布局后collectionView宽度才会准确

self.bgView.frame =CGRectMake(0,0, targetSize.width,44);

[self.bgView layoutIfNeeded];

// 在对collectionView进行布局

self.collectionView.frame =CGRectMake(0,0, targetSize.width-MAGIN16*2,44);

[self.collectionView layoutIfNeeded];

// 由于这里collection的高度是动态的，这里cell的高度我们根据collection来计算

CGSizecollectionSize =self.collectionView.collectionViewLayout.collectionViewContentSize;

CGFloatcotentViewH = collectionSize.height + MAGIN16*2;

returnCGSizeMake([UIScreenmainScreen].bounds.size.width, cotentViewH);

}