Question

我正在关注UICollectionView上的YouTube tutorial，但是我在Swift中使用Xcode 6和iOS SDK 8.0进行编码（我也尝试使用7.1和7.0）。

这是我的控制器：

import UIKit

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {

    var imagesArray:String[] = []
    let cellIdentifier = "CollectionCell"

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        imagesArray += "Swift"
        imagesArray += "is"
        imagesArray += "the"
        imagesArray += "next"
        imagesArray += "hotness"
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfSectionsInCollectionView(collectionView: UICollectionView!) -> Int {
        return 1
    }

    func collectionView(collectionView: UICollectionView!, numberOfItemsInSection section: Int) -> Int {
        return imagesArray.count
    }

    func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! {

        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(cellIdentifier, forIndexPath: indexPath) as UICollectionViewCell
        var label:UILabel = cell.viewWithTag(100) as UILabel
        label.text = imagesArray[indexPath.row]
        cell.layer.borderWidth = 2.0
        cell.layer.borderColor = UIColor.whiteColor().CGColor
        cell.layer.cornerRadius = 50.0

        return cell
    }

}

我已将故事板中的CollectionViewCell标识符设置为CollectionCell，将标记设置为100。我正在构建应用程序，但在运行时收到此错误：

error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0).
The process has been returned to the state before expression evaluation.

此行发生错误：

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(cellIdentifier, forIndexPath: indexPath) as UICollectionViewCell

但是，当我调试时，我注意到po indexPath返回nil。此外，如果我在let cell调用后注释掉所有代码，则该应用会运行。

有什么想法吗？

Answer 1

我遇到了同样的问题，为什么它失败的原因是你需要将UILabel的标签设置为100而不是UICollectionViewCell。那应该为你解决。

UICollectionView示例因EXC_BAD_INSTRUCTION而失败

1 个答案: