2016-12-25 67 views
-1

我正在开发一个应用程序,其中一个视图是UICollectionView。我已经使集合视图完全正常工作。当用户按下其中一个收集视图单元格时,会打开一个带有照片的新视图。但是,当我尝试在集合视图上滚动时,应用程序崩溃。在UICollectionView上滚动时应用程序崩溃

这里是我的代码:

cell.imageView?.image = self.cellMapArray[indexPath.row] 

我得到的错误是

fatal error: Index out of range (lldb)." And the line of code is highlighted with the error "Thread 1: EXC_BAD_INSTRUCTION (code=EXC_l386_INVOP, subcode=0x0)

任何帮助将是:

let cellMapArray = [UIImage(named: "pomona.jpg"), UIImage(named: "Pitzer.jpg"), UIImage(named: "Mudd.jpg"), UIImage(named: "Scripps.jpg"), UIImage(named: "CMC1.jpg")] 


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
{ 
    return self.schoolNames.count 
} 

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
{ 

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell 

    cell.imageView?.image = self.cellMapArray[indexPath.row] 

    cell.imageTitle?.text = self.schoolNames[indexPath.row] 

    return cell 

} 

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
{ 
    self.performSegue(withIdentifier: "showImage", sender: self) 
} 

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
{ 
    if segue.identifier == "showImage" 
    { 
     let indexPaths = self.collectionView!.indexPathsForSelectedItems! 
     let indexPath = indexPaths[0] as IndexPath 
     let vc = segue.destination as! NewViewController 
     vc.image = self.mapArray[indexPath.row]! 
     vc.title = self.schoolNames[indexPath.row] 
    } 
} 

并线时,应用程序崩溃是高亮不胜感激!

+2

在一个元件中使用多个数组作为数据源是容易出错。发生错误如果'schoolNames'和'cellMapArray'中的项数不相等。使用自定义类或结构来避免这种错误。 – vadian

回答

2

作为错误状态,则indexPath.row值不是在阵列cellMapArray的边界。确保cellMapArray具有阵列中的足够的元素,从而使所述阵列具有索引indexPath.row