Swift 1.2 [AnyObject] 没有名为 'objectForKey' 的成员

Question

升级到 Swift 1.2 后，出现错误:

[AnyObject] does not have member named 'objectForKey'

代码:

self.photoNames = objects.map { $0.objectForKey("PhotoName") as! String }

其中objects是类型[AnyObject]

编辑:(更多代码)

var photoNames: [String] = []
var query = PFQuery(className: "Photos")
query.findObjectsInBackgroundWithBlock ({(objects:[AnyObject]?, error: NSError?) in
    if(error == nil){
        self.photoNames = objects.map { $0.objectForKey("PhotoName") as! String }
    }
    else{
        println("Error in retrieving \(error)")
    }
        
})

Answer 1

objectForKey: 是 NSDictionary 的成员方法，而不是 AnyObject。这是Reference .

如果 objects 是 NSDictionary 数组，请尝试以下操作:

self.photoNames = objects?.map { ($0 as? NSDictionary)?.objectForKey("PhotoName") as! String } ?? []