我有以下代码
func collectionVIEw(collectionVIEw: UICollectionVIEw,dIDSelectItemAtIndexPath indexPath: NSIndexPath) { let person = people[indexPath.item] let questionController = UIAlertController(Title: "What u wanna do?",message: nil,preferredStyle: .Alert) questionController.addAction(UIAlertAction(Title: "Rename person",style: .Default,handler: { (action:UIAlertAction!) -> VoID in let ac = UIAlertController(Title: "Rename person",preferredStyle: .Alert) ac.addTextFIElDWithConfigurationHandler(nil) ac.addAction(UIAlertAction(Title: "Cancel",style: .Cancel,handler: nil)) ac.addAction(UIAlertAction(Title: "OK",style: .Default) { [uNowned self,ac] _ in let newname = ac.textFIElds![0] as! UITextFIEld person.name = newname.text self.collectionVIEw.reloadData() }) self.presentVIEwController(ac,animated: true,completion: nil) })) questionController.addAction(UIAlertAction(Title: "Delete Person",handler: { (action:UIAlertAction!) -> VoID in println("hello world") self.collectionVIEw.deleteItemsAtIndexPaths([indexPath.item]) self.collectionVIEw.reloadData() })) presentVIEwController(questionController,completion: nil)}
当我按删除人员时,你好世界工作正常和应用程序崩溃
控制台输出是
hello world2015-07-18 13:40:14.628 Project10[15888:1274436] -[__NSCFNumber section]: unrecognized selector sent to instance 0xb0000000000000032015-07-18 13:40:14.636 Project10[15888:1274436] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[__NSCFNumber section]: unrecognized selector sent to instance 0xb000000000000003'
我究竟做错了什么 ?
你应该改变self.collectionVIEw.deleteItemsAtIndexPaths([indexPath.item])
至
self.collectionVIEw.deleteItemsAtIndexPaths([indexPath])
deleteItemsAtIndexPaths
需要一个NSIndexPaths数组,而不是数组.
除此之外,如果你调用deleteItemsAtIndexPaths,你不需要调用reloadData – 这甚至可以防止任何动画发生.
不要忘记更新数据源 – 必须从人员阵列中删除此人.
people.removeAtIndex(indexPath.item)
在调用deleteItemsAtIndexPaths之前执行此 *** 作.
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