ios - 对成员 'Int.init' 的模糊引用

Question

更新到 Xcode7 和 iOS9 后，我在 swift 文件中的这一行“dueDate”: Int(date.timeIntervalSince1970 * 1000),”类型转换中收到错误“对成员 'Int.init' 的模糊引用”。请帮助我。

var date: NSDate! //Declared in the beginning of file
var updatedTask = [
        "description": self.descriptionTextfield.text,
        "title": self.titleTextfield.text,
        "priority": self.priorityTextfield.text!.uppercaseString,
        "type": self.typeTextfield.text!.uppercaseString,
        "dueDate": Int(date.timeIntervalSince1970 * 1000),
        "privacy": self.privateSwitch.on ? "PRIVATE": "PUBLIC"
    ]

Answer 1

最小的复制代码是:

var field: UITextField = UITextField()
let dict = [
    "foo": Int(42),
    "bar": field.text
]

这里的问题是UITextField.text的类型:

Xcode6.4:

    var text: String! // default is nil

Xcode7.0:

    public var text: String? // default is nil

它从ImplicitlyUnwrappedOptional 改变了至 Optional

所以上面代码中的字典字面量有类型

[
   String: Int,
   String: Optional<String>
]

然后Optional<String>无法桥接到 AnyObject .这就是编译器混淆的原因。

要解决此问题，您必须强制展开 .text属性:

var updatedTask = [
    "description": self.descriptionTextfield.text!, // <- HERE
    "title": self.titleTextfield.text!, // <- HERE
    "priority": self.priorityTextfield.text!.uppercaseString,
    "type": self.typeTextfield.text!.uppercaseString,
    "dueDate": Int(date.timeIntervalSince1970 * 1000),
    "privacy": self.privateSwitch.on ? "PRIVATE": "PUBLIC"
]