原文链接：//www.greatytc.com/p/2b4320276faf
要使用本代码，请查看原文的其他内容进行使用
原代码有问题：如果是在多个分组的时候，cell会重叠；
对原文的代码进行了优化，如果遇到分组则不改变坐标；
-(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect{
NSMutableArray *attributes = [[super layoutAttributesForElementsInRect:rect] mutableCopy];
//注意起始值
for(NSInteger i = 1; i < [attributes count]; i++){
UICollectionViewLayoutAttributes *currentLayoutAttributes = attributes[i];
UICollectionViewLayoutAttributes *prevLayoutAttributes = attributes[i - 1];
NSInteger prevorigin = CGRectGetMaxX(prevLayoutAttributes.frame);
NSInteger curIndex = currentLayoutAttributes.indexPath.section;
NSInteger preIndex = prevLayoutAttributes.indexPath.section;
if (curIndex != preIndex) { //如果是分组进行跳过
continue;
}
if(prevorigin + 10 + currentLayoutAttributes.frame.size.width < self.collectionViewContentSize.width-20){
CGRect frame = currentLayoutAttributes.frame;
frame.origin.x = prevorigin + 10;
currentLayoutAttributes.frame = frame;
}
}
return attributes;
}
