我正迅速地遇到怪异的行为。我有
let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData = [valueOne, valueTwo]
但这给了我一个编译器错误
xxxController.type没有名为'valueOne'的成员
当我尝试
let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData = [
[
"title": "May 29th",
"value": "260"
],
[
"title": "April 24th",
"value": "260"
]
]
它工作正常，没有错误。另外，当我在Playground中尝试这两个代码时，它们都可以正常工作。
我的问题是我在第一段中做错了什么？
假设您的行为如下：
class xxxController: UIViewController {
let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData = [valueOne, valueTwo]
// ....
}
您无法执行此操作，因为我们无法在声明中引用实例属性class。
相反，在这种情况下，应将它们设置为static属性：
class xxxController: UIViewController {
static let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
static let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData = [valueOne, valueTwo]
// ....
}
或historyData在初始化器中初始化：
class xxxController: UIViewController {
let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData:[[String: String]]
required init(coder aDecoder: NSCoder) {
historyData = [valueOne, valueTwo]
super.init(coder: aDecoder)
}
override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
historyData = [valueOne, valueTwo]
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}
// ....
}
或historyData以[[String: String]]!并在中分配给它viewDidLoad()：
class xxxController: UIViewController {
let valueOne: [String: String] = [
"title": "May 29th",
"value": "260"
]
let valueTwo = [
"title": "April 24th",
"value": "260"
]
var historyData:[[String: String]]!
override func viewDidLoad() {
super.viewDidLoad()
historyData = [valueOne, valueTwo]
}
// ....
}
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