2015-10-15 189 views
2

UICollectionView的標題顯示不正確。我在頭文件中添加了一個UILabel,它應該顯示節號。當我調試viewForSupplementaryElementOfKind時,一切看起來都不錯。我查看了關於collectionView標題的不同教程,並且在代碼中找不到該錯誤。 enter image description hereSwift UICollectionView標題顯示不正確

這裏是整個代碼:

import UIKit 

class ViewController: UIViewController { 

    var collectionView:UICollectionView!; 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     let layout:UICollectionViewFlowLayout = UICollectionViewFlowLayout(); 
     layout.sectionInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20); 
     layout.itemSize = CGSize(width: 60, height: 60); 
     layout.headerReferenceSize = CGSize(width: CGRectGetWidth(self.view.bounds), height: 50); 

     collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout); 


     collectionView.dataSource = self; 
     collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell"); 
     collectionView.registerClass(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "header"); 
     collectionView.delegate = self; 
     self.view.addSubview(collectionView); 

    } 

} 

extension ViewController:UICollectionViewDataSource{ 
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
     return 5; 
    } 

    func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int { 
     return 10 
    } 

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
     let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath); 

     cell.backgroundColor = UIColor.whiteColor(); 

     return cell; 
    } 




    func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView { 

     let view = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "header", forIndexPath: indexPath) 

     view.backgroundColor = UIColor.blueColor(); 


     let label = UILabel(frame: view.frame); 
     label.text = String(indexPath.section); 
     label.font = UIFont(name: "helvetica", size: 40); 
     label.textAlignment = .Center; 
     view.addSubview(label); 



     return view; 

    } 


} 
+1

這不是你的問題的根源,但它很重要:你並沒有意識到'collectionView.dequeueReusableSupplementaryViewOfKind'返回一個_reusable_視圖。這個詞很重要。該視圖可能與已用於其他標題的視圖相同。如果是這樣,你不想再次添加標籤。 – matt

回答

6

替換行

let label = UILabel(frame: view.frame); 

let label = UILabel(frame: view.bounds); 

雖然你要注意,你需要修復與您的代碼的其他問題關於重用補充觀點。我建議創建一個帶有標籤的UICollectionReusableView的子類,而不是從數據源手動添加新標籤。