布局 – CollectionView动态单元格高度swift

概述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 *** 纵cellSize.height.
基本逻辑就是这样

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

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