IOS UICollectionview动态更改Cell的高度 [英] IOS UICollectionview Dynamically change Cell's Height

问题描述

我正在开发基于集合视图的项目，根据用户点击特定索引，将更改Numberofitem并增加其数量。所有在我的项目中完美运行，但我无法根据集合视图中的单元格数设置单元格大小。更多集合视图将无法滚动所有单元格修复视图中的调整大小。
这里我附上了所有图片。

I am working on collection-view Based project on which Numberofitem will be changed and increase according to user's click on Particular Index. all Works perfectly in my project but i am not able to set Cell size according to number of cell's in collection-view.Moreover collectionview will not be scrollable all cell fix in view with resize. Here i have attached all the image's .

1）故事板视图

2）四个单元格的结果

3）当细胞数量增加时

目前我通过这种方式设置了我的细胞以下代码。但我想设置一下，如果在集合视图中有四个单元格，那么每个单元格的大小会根据集合视图和设备大小增加和拟合（iphone 5s，iphone 6，iphone 6plus）

Currently i done setup of my cell by this way with following code. but i want to set that, if there is four cell in collection-view then the size of each cell increases and fit according to collection-view and device size (iphone 5s , iphone 6 , iphone 6plus)

这是我的尝试，

-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{
    return 5.0;
}
-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
    return 5.0;
}
- (CGSize)collectionView:(UICollectionView *)collectionView
              layout:(UICollectionViewLayout *)collectionViewLayout
  sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
        ////@property NSInteger count;////
 if (_count == 0)  {
    //  width = ((width - (span*5))/4);
    //        return CGSizeMake(self.view.frame.size.width/4,  self.view.frame.size.height/4);
    return CGSizeMake(self.view.frame.size.width/2.5, self.view.frame.size.height/5);
}
if (_count == 1 || _count == 2)
{
    return CGSizeMake(self.view.frame.size.width/2.5, self.view.frame.size.height/5);
    // return CGSizeMake(100.0, 100.0);
}
if (  _count == 3 || _count == 4 || _count == 5)
{
    // return CGSizeMake(100.0, 100.0);
    return CGSizeMake(self.view.frame.size.width/3.5, self.view.frame.size.height/6.5);
}
if (  _count == 6 || _count == 7 || _count == 8 || _count == 9)
{
    //return CGSizeMake(90.0, 90.0);
    return CGSizeMake(self.view.frame.size.width/4, self.view.frame.size.height/8);
}
if (  _count == 10 || _count == 11 || _count == 12 || _count == 13 || _count == 14)
{
    //  return CGSizeMake(80.0, 80.0);
    return CGSizeMake(self.view.frame.size.width/4, self.view.frame.size.height/8);
}
if (  _count == 15 || _count == 16 || _count == 17 || _count == 18 || _count == 19 || _count ==20)
{
    //return CGSizeMake(70.0, 70.0);
    return CGSizeMake(self.view.frame.size.width/4.75, self.view.frame.size.height/9.5);
}
if (_count ==21 || _count == 22 || _count == 23 || _count == 24 || _count == 25 || _count == 26 || _count == 27) {
    // return CGSizeMake(60.0, 60.0);
    return CGSizeMake(self.view.frame.size.width/6, self.view.frame.size.height/12);
}
if (_count ==28 || _count == 29  ) {
    //  return CGSizeMake(50.0, 50.0);
    return CGSizeMake(self.view.frame.size.width/6.25, self.view.frame.size.height/12.5);
}
else
    return CGSizeMake(0, 0);
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return itemincollectionview.count;
}

注意： -
我有也尝试了所有方法。

Note:- I have also tried this all Method.

  - (void)viewDidLayoutSubviews
  {
    self.automaticallyAdjustsScrollViewInsets = NO;
    [self.collectionView layoutIfNeeded];
    NSArray *visibleItems = [self.collectionView indexPathsForVisibleItems];
    NSIndexPath *currentItem = [visibleItems objectAtIndex:0];
    NSIndexPath *nextItem = [NSIndexPath indexPathForItem:_setRandomIndex inSection:currentItem.section];

    [self.collectionView scrollToItemAtIndexPath:nextItem atScrollPosition:UICollectionViewScrollPositionNone animated:YES];
 }

 - (void)viewWillLayoutSubviews
 {
    [super viewWillLayoutSubviews];
    [self.collectionView.collectionViewLayout invalidateLayout];
 }

 -(void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:YES];
     [self.view layoutIfNeeded];
 }

推荐答案

项目中的一切都很好只需要添加一个新的委托方法，如下所示：

Everything in your project is fine just you need to add a new delegate method as follows:

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(15, 20, 20, 20);
}

根据您拥有的计数数量，此方法会有所不同。插入设置将是常见的：

Vary this method insets according to number of counts of you have. inset setting will be common for:

self.view.frame.size.width/2.5

并且不同于：

self.view.frame.size.width/3.5

因此额外的间距问题将得到解决

hence the extra spacing issue will be solved

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