在方向更改时自动调整子视图（UICollectionView）的大小答案

【问题标题】：Autoresizing of subviews ( UICollectionView) on orientation change在方向更改时自动调整子视图（UICollectionView）的大小
【发布时间】：2014-11-02 18:07:53
【问题描述】：

我创建了一个 CustomView ganttChartView 并从 storyboard 添加它。现在在 ganttChartView 我有一个 UICollection 视图，它将代表时间线并以编程方式添加。

// Initialize GanttChat View from Interface Builder or Storyboard File 
-(id)initWithCoder:(NSCoder *)aDecoder
{
self= [super initWithCoder:aDecoder];
if (self) {
    self.timeLineHeight =KMinTimeLineCellHeight;
    self.timeLineCellWidth=kMinTimeLineCellWidth;
    self.backgroundColor = [UIColor redColor];
    self.autoresizesSubviews = YES;
    }
 return self;
 }

-(void)reloadTimelineView
 {
  [self initializeTimeLineView];

  [self.timeLineCollectionView reloadData];
 }

-(void) initializeTimeLineView
{
// Initialization of StartDate End Date and DateMode Property
[self initializeTimeLineDates];

// Creating Layout for Collection view
UICollectionViewFlowLayout* flowLayout = [[UICollectionViewFlowLayout alloc]init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];

CGSize  cellSize =CGSizeMake(self.timeLineCellWidth, self.timeLineHeight) ;
flowLayout.itemSize = cellSize ;
flowLayout.minimumInteritemSpacing= 1.0f;
flowLayout.minimumLineSpacing=5.0f;

CGRect timeLineFrame =CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, self.timeLineHeight);

// Initialization of CollectionView for TimeLine
self.timeLineCollectionView = [[UICollectionView alloc] initWithFrame:timeLineFrame collectionViewLayout:flowLayout];

  [self.timeLineCollectionView registerClass:[A3TimeLineCollectionViewCell class] forCellWithReuseIdentifier:timeLineCell_ID];
self.timeLineCollectionView.backgroundColor = self.timeLineBackgroundColor;

// Initialization of CollectionView DataSource and Delegate with Start Date and End date and DateMode
self.timeLineDataSource = [[A3GanttChartTimeLineDelegate alloc] initWithDate:self.startDate andDate:self.endDate withMode:self.dateType];

self.timeLineDataSource.gantChartView = self;
self.timeLineDataSource.timeLineEachCellColor = self.timeLineEachCellColor;

self.timeLineCollectionView.delegate=self.timeLineDataSource;
self.timeLineCollectionView.dataSource=self.timeLineDataSource;


[self addSubview:self.timeLineCollectionView];

}

现在，我从 Storyboard 中禁用了 AutoLayout 选项，并且从 ganttChartView 的 size Inspector 中我已将顶部和左侧角设置为固定，以便在更改方向后调整其大小。

现在的问题是 TimeLineCollection 视图没有在方向更改为横向时调整大小。由于它以编程方式添加，所以我需要做的是让它在方向更改时调整大小。

盈利模式

横向模式

【问题讨论】：

标签： ios uiview uicollectionview autolayout autoresize

【解决方案1】：

您还需要设置右角固定以便在方向更改后调整大小

【讨论】：

【解决方案2】：

self.timeLineCollectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleBottomMargin;

【讨论】：

感谢您的回复，但它对我不起作用。有什么方法可以让我们以编程方式使用 NSLayoutConstraint 来解决这个问题。

【解决方案3】：

我已经使用 NSLayoutConstraint 解决了这个问题。

// NSLayoutConstraint for making same width of timelineCollectionView with the GanttChart

NSLayoutConstraint *timeLineCollectionViewWidth =[NSLayoutConstraint
                                   constraintWithItem:self.timeLineCollectionView
                                   attribute:NSLayoutAttributeWidth
                                   relatedBy:0
                                   toItem:self
                                   attribute:NSLayoutAttributeWidth
                                   multiplier:1.0
                                   constant:0];

 [self addConstraint:timeLineCollectionViewWidth];

// NSLayoutConstraint for making same left position  of timelineCollectionView with the GanttChart

NSLayoutConstraint *timeLineCollectionViewLeft = [NSLayoutConstraint
                                                 constraintWithItem:self.timeLineCollectionView
                                                 attribute:NSLayoutAttributeLeft
                                                 relatedBy:NSLayoutRelationEqual
                                                 toItem:self
                                                 attribute:NSLayoutAttributeLeft
                                                 multiplier:1.0f
                                                 constant:0.f];
[self addConstraint:timeLineCollectionViewLeft];

// NSLayoutConstraint for seting height  of timelineCollectionView 

NSLayoutConstraint *heightConstraint =
[NSLayoutConstraint constraintWithItem:self.timeLineCollectionView
                             attribute:NSLayoutAttributeHeight
                             relatedBy:NSLayoutRelationEqual
                                toItem:nil
                             attribute:NSLayoutAttributeNotAnAttribute
                            multiplier:1.0
                              constant:self.timeLineHeight];
[self.timeLineCollectionView addConstraint:heightConstraint];

【讨论】：