ios – 通过索引访问数组对象导致 – [_ NSFaultingMutableSet objectAtIndex：]：

概述所以我在这里有函数collectionView：cellForItemAtIndexPath： func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { let cell = collec 所以我在这里有函数collectionVIEw：cellForItemAtIndexPath：

func collectionVIEw(collectionVIEw: UICollectionVIEw,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionVIEwCell {        let cell = collectionVIEw.dequeueReusableCellWithReuseIDentifIEr("cellID",forIndexPath: indexPath)        print("Creating collection vIEw number: \(indexPath.row)")        // Configure the cell        cell.backgroundcolor = UIcolor.lightGraycolor()        let thing = Mirror(reflecting: annotation?.photos!)        print(thing.subjectType)        print(annotation?.photos![indexPath.row])        return cell}

这是我的注释对象和照片对象的声明

class CustomAnnotation : NSManagedobject,MKAnnotation {    @NSManaged var latitude: NSNumber    @NSManaged var longitude : NSNumber    @NSManaged var Title : String?    @NSManaged var subTitle: String?    @NSManaged var photos : [Photo]?    var coordinate = CLLocationCoordinate2D()    overrIDe init(entity: NSEntityDescription,insertIntoManagedobjectContext context : NSManagedobjectContext?) {        super.init(entity: entity,insertIntoManagedobjectContext: context)    }    init(coordinate : CLLocationCoordinate2D,context: NSManagedobjectContext) {        let entity = NSEntityDescription.entityForname("CustomAnnotation",inManagedobjectContext: context)!        super.init(entity: entity,insertIntoManagedobjectContext: context)        self.longitude = coordinate.longitude        self.latitude = coordinate.latitude        print(photos)    }    func setCoordinate() {        self.coordinate.longitude = CLLocationdegrees(self.longitude)        self.coordinate.latitude = CLLocationdegrees(self.latitude)    }}class Photo : NSManagedobject {    @NSManaged var imagePath : String    @NSManaged var customAnnotation : CustomAnnotation    overrIDe init(entity: NSEntityDescription,insertIntoManagedobjectContext context: NSManagedobjectContext?) {        super.init(entity: entity,insertIntoManagedobjectContext: context)    }    init(imagePath: String,context : NSManagedobjectContext) {        let entity = NSEntityDescription.entityForname("Photo",insertIntoManagedobjectContext: context)        self.imagePath = imagePath    }}

这就是我如何保存与CustomAnnotation类具有反多对一关系的Photos对象

if (annotation?.photos)!.isEmpty {            // Load photos            print("downloading photos")            dispatch_async(dispatch_get_main_queue()) {                FlickrClIEnt.sharedInstance().getFlickrImages(self) {(result,success,errorString) in                    if success {                        print("loading photos")                        // Use the inverse relationship to save the data                        for photoURL in result as! [String] {                            let photo = Photo(imagePath: photoURL,context: self.sharedContext)                            photo.customAnnotation = self.annotation!                            print(photo.imagePath)                        }                        dispatch_async(dispatch_get_main_queue()) {                            self.collectionVIEw!.reloadData()                        }                        CoreDataStackManager.sharedInstance().saveContext()                    }                    else {                        self.showAlert("Error",message: errorString!,confirmbutton: "OK")                    }                }            }        }

这是崩溃时发生的事情的日志：

Creating collection vIEw number: 0Optional <Array<Photo>> 2015-12-27 00:15:07.046 VirtualTourist[10413:1965722] -[_NSFaultingMutableSet objectAtIndex:]: unrecognized selector sent to instance 0x7f956d4d8cf02015-12-27 00:15:07.058 VirtualTourist[10413:1965722] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[_NSFaultingMutableSet objectAtIndex:]: unrecognized selector sent to instance 0x7f956d4d8cf0'

我不明白为什么print(注释？.photos！[indexPath.row])崩溃我的程序.我在线阅读,它说这是对象是NSSet但是注释的结果？.photo！是一个阵列.所以我有点卡住,有什么提示吗？

解决方法 我已经解决了,因为在我的数据模型中我选择了CustomAnnotation实体中的照片关系是无序的,即使在类定义中照片变量是一个数组,也总是返回NSSet.

我需要做的就是将Arranged设置为Ordered：

一切正常,返回一个Array而不是NSSet

总结

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