Question

更新到Xcode7和iOS9后，我收到错误＆＃34;对成员＆＃39; Int.init＆＃39;＆＃34;在此行的类型转换＆＃34; dueDate＆＃34;：Int（date.timeIntervalSince1970 * 1000），＆＃34;在swift文件中。请帮帮我。

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

最小再现代码为：

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

此处的问题是UITextField.text：

的类型

Xcode6.4：

    var text: String! // default is nil

Xcode7.0：

    public var text: String? // default is nil

它已从ImplicitlyUnwrappedOptional更改为Optional

因此上面代码中的字典文字具有类型

[
   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，您必须强制解包.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"
]

Answer 2

需要给编译器更多关于类型的信息解决了我的问题。谢谢你的帮助。

 var updatedTask : [String : Any] = 
 [
    "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"
 ]

对会员＆＃39; Int.init＆＃39;

2 个答案: