我有一个完成块,将结构数组数组交给另一个viewcontroller .
此数据在viewDidLoad中接收,如:
var packArray = [Any]()// the block is returning Any
override func viewDidLoad() {
super.viewDidLoad()
BuildArray.buildArrayFromQuery(queryForCollection: "Pack", sender: self) { (result) in
self.packArray = [result]
}
}
打印这个self.packArray在一行中返回以下所有内容,我现在不知道如何提取数据 .
[[static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk00", description: "This is some text", title: "Not a murderer", image: <PFFile: 0x60000005fc80>, id: "rHITAAHJYk"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk01", description: "This is some text", title: "Addiction", image: <PFFile: 0x600000240300>, id: "uGHHpPF89e"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk02", description: "This is some text", title: "Towels are noisy", image: <PFFile: 0x600000240570>, id: "PeM7hJ4sih"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk03", description: "This is some text", title: "Class action", image: <PFFile: 0x6000002407e0>, id: "LoSXT2PFoS"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk04", description: "This is some text", title: "Beer", image: <PFFile: 0x600000240a50>, id: "vxEsd13twt"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk05", description: "This is some text", title: "Not again...", image: <PFFile: 0x600000240cc0>, id: "JNqaAgtdRb"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk06", description: "This is some text", title: "Foreign cars", image: <PFFile: 0x600000240f30>, id: "Hb16TDXGbz"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk07", description: "This is some text", title: "Skin problems", image: <PFFile: 0x6000002411a0>, id: "MUYDMnJCrU"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk08", description: "This is some text", title: "Junk food", image: <PFFile: 0x600000241410>, id: "yowAfJlcmr"), static ParseStarterProject_Swift.BuildArray.(buildArrayFromQuery (queryForCollection : Swift.String, sender : __ObjC.UIViewController, completeBlock : (Any) -> ()) -> ()).(collectionStruct #1)(name: "pk09", description: "This is some text", title: "Delusion", image: <PFFile: 0x600000241680>, id: "TiLAKBPmaD")]]
以前我用过:
cell.labelCell.text = self.packArray[indexPath.item].packDescription
但现在返回没有成员packDescription . 我可能会使用字符串处理并创建一个混乱,但必须有一个更好的方法将数据作为一个实际的数组 . 我知道我正在将其转换为Any但无法想出通过完成块从结构数组中获取数据的另一种方法 .
-----编辑----
在创建数组的类中有一个struct,而struct中的数组结果通过completeBlock作为Any传递
class func buildArrayFromQuery(queryForCollection: String,
sender: UIViewController,
completeBlock: @escaping (_ result: Any) -> Void) {
struct collectionStruct {
var name : String
var description : String
var title : String
var image : PFFile
var id: String
}
var collectionArray = [collectionStruct]()
然后从PFQuery创建,并将结果数组传回完成处理程序
query.findObjectsInBackground(block: { (objects, error) in
if error != nil {
print(error!)
} else if let packs = objects {
for object in packs {
print(fromName)
print(object)
let arrayName = object.object(forKey: fromName) as! String
let arrayDescription = object.object(forKey: fromDescription) as! String
let arrayTitle = object.object(forKey: fromTitle) as! String
let arrayImage = object.object(forKey: fromImage) as! PFFile
let arrayID = object.objectId as String!
collectionArray.append(collectionStruct(name: arrayName, description: arrayDescription, title: arrayTitle, image: arrayImage, id: arrayID!))
}
}
completeBlock(result: collectionArray)
})
2 回答
非常感谢Duncan C的投入,感谢你的回答是正确的我只想分享我如何调整它以使其正常工作 .
定义了类外的结构,这让我在完成处理程序中使用[collectionStruct] .
然后在查询后返回数组
然后在Duncan C建议的另一个 class
这仍然是一个警告:
好久不知道我能在这做什么 .
您需要将查询结果强制转换为所需类型 . 如果使packArray成为可选项,则可以直接使用它进行分配
使用该代码,如果结果无法转换为正确的数组类型,则self.packArray将包含nil .
或者您可以使用可选绑定:
...
您应该在viewDidLoad之外定义packArray:
您的代码在viewDidLoad中定义了一个局部变量packArray,这会让事情变得混乱 . 我建议不要使用实例变量和具有相同名称的局部变量 .