Xcode失败，退出代码为254-Xcodefailedwithexitcode254

I've looked for a solution but i found nothing. Withe the beta 3 of XCode 6 my code doesn't work anymore. Xcode returns me this error:

我找了一个解决方案，但我一无所获。与XCode 6的beta 3一样，我的代码不再有效。 Xcode将此错误返回给我：

While emitting SIL for 'tableView' at /Users/Marco/Desktop/iPrescription/iPrescription/MedicineTableViewController.swift:109:14 :0: error: unable to execute command: Segmentation fault: 11 :0: error: swift frontend command failed due to signal (use -v to see invocation) Command /Applications/Xcode6-Beta3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254

在/Users/Marco/Desktop/iPrescription/iPrescription/MedicineTableViewController.swift:109:14：0发出'tableView'的SIL时：错误：无法执行命令：分段错误：11：0：错误：swift前端命令失败到期发信号（使用-v查看调用）命令/Applications/Xcode6-Beta3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift失败，退出代码为254

i'm new to ios programming and i don't know what to do to finding the origin of this problem. I'm very frustrated because i don't know what looking for.

我是ios编程的新手，我不知道如何找到这个问题的根源。我非常沮丧，因为我不知道在寻找什么。

1 个解决方案

let cell = collectionView?.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as CustomCell

let cell = collectionView!.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as CustomCell

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