布局 – CollectionView动态单元格高度swift
发布时间:2020-12-14 05:37:08 所属栏目:百科 来源:网络整理
导读:我试图创建一个集合视图,其中单元格显示具有可变长度的字符串. Im使用此功能设置单元格布局: func collectionView(collectionView : UICollectionView,layout collectionViewLayout:UICollectionViewLayout,sizeForItemAtIndexPath indexPath:NSIndexPath)
我试图创建一个集合视图,其中单元格显示具有可变长度的字符串.
Im使用此功能设置单元格布局: func collectionView(collectionView : UICollectionView,layout collectionViewLayout:UICollectionViewLayout,sizeForItemAtIndexPath indexPath:NSIndexPath) -> CGSize { var cellSize:CGSize = CGSizeMake(self.whyCollectionView.frame.width,86) return cellSize } 我想做的是根据我的cell.labelString.utf16Count长度操纵cellSize.height. if((cell.labelString.text) > 70){ cellSize.height = x } else{ cellSize.height = y } 但是,我无法检索我的单元格标签长度,总是返回nil. (我觉得没有加载… 为了更好的理解,这里是完整的代码: // WhyCell section var whyData:NSMutableArray! = NSMutableArray() var textLength:Int! @IBOutlet weak var whyCollectionView: UICollectionView! //Loading data @IBAction func loadData() { whyData.removeAllObjects() var findWhyData:PFQuery = PFQuery(className: "PlacesWhy") findWhyData.whereKey("placeName",equalTo: placeName) findWhyData.findObjectsInBackgroundWithBlock({ (objects:[AnyObject]!,error:NSError!)->Void in if (error == nil) { for object in objects { self.whyData.addObject(object) } let array:NSArray = self.whyData.reverSEObjectEnumerator().allObjects self.whyData = array.mutableCopy() as NSMutableArray self.whyCollectionView.reloadData() println("loadData completed. datacount is (self.whyData.count)") } }) } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. self.loadData() } func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int { return 1 } func collectionView(collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int { return whyData.count } func collectionView(collectionView: UICollectionView,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { let cell:whyCollectionViewCell = whyCollectionView.dequeueReusableCellWithReuseIdentifier("whyCell",forIndexPath: indexPath) as whyCollectionViewCell // Loading content from NSMutableArray to cell let therew:PFObject = self.whyData.objectAtIndex(indexPath.row) as PFObject cell.userWhy.text = therew.objectForKey("why") as String! textLength = (therew.objectForKey("why") as String!).utf16Count self.whyCollectionView.layoutSubviews() // Displaying user information var whatUser:PFQuery = PFUser.query() whatUser.whereKey("objectId",equalTo: therew.objectForKey("reasonGivenBy").objectId) whatUser.findObjectsInBackgroundWithBlock({ (objects: [AnyObject]!,error: NSError!)->Void in if !(error != nil) { if let user:PFUser = (objects as NSArray).lastObject as? PFUser { cell.userName.text = user.username // TODO Display avatar } } }) return cell } func collectionView(collectionView : UICollectionView,86) return cellSize }
您可以在cellForItemAtIndexPath函数中动态设置单元格的框架,因此如果忽略sizeForItemAtIndexPath函数,您可以根据标签自定义高度.通过自定义大小,您可能需要查看集合视图布局流程,但希望这可以指向正确的方向.它可能看起来像这样:
class CollectionViewController: UICollectionViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout { var array = ["a","as","asd","asdf","asdfg","asdfgh","asdfghjk","asdfghjklas","asdfghjkl","asdghjklkjhgfdsa"] var heights = [10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,110.0] as [CGFloat] override func viewDidLoad() { super.viewDidLoad() } override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int { return 1 } override func collectionView(collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int { return array.count } override func collectionView(collectionView: UICollectionView,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CellID",forIndexPath: indexPath) as Cell cell.textLabel.text = array[indexPath.row] cell.textLabel.sizeToFit() // Customize cell height cell.frame = CGRectMake(cell.frame.origin.x,cell.frame.origin.y,cell.frame.size.width,heights[indexPath.row]) return cell } func collectionView(collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { return CGSizeMake(64,64) } } 这给了动态高度 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |