将 Swift 字典转换为 NSDictionary

我创建了一个 Swift Dictionary 对象

var params = ["first_name": firstNameTextField.text,
              "last_name": lastNameTextField.text,
              "company": companyTextField.text,
              "email_address": emailTextField.text,
              "phone_number": phoneTextField.text]

接下来，我将 ObjC 框架连接到我的 Swift 应用程序。 里面有一个带有属性的对象

@property (nonatomic, retain) NSMutableDictionary *fields;

我正在尝试这样分配它

object.fields = params

并得到一个错误：

Cannot convert the expression's type '()' to type 'NSMutableDictionary!'

我也尝试这样做

var params = ["first_name": firstNameTextField.text,
              "last_name": lastNameTextField.text,
              "company": companyTextField.text,
              "email_address": emailTextField.text,
              "phone_number": pnoneTextField.text].mutableCopy() as NSMutableDictionary

object.fields = params

它编译得很好，但我遇到了运行时错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: 
attempt to insert nil object from objects[0]'

我已经打印了所有字段，并且它们不为零：

println(firstNameTextField.text)
println(lastNameTextField.text)
println(companyTextField.text)
println(emailTextField.text)
println(pnoneTextField.text)

...

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有任何想法吗？

Try parms.bridgeToObjectiveC()。不过，这可能会给你一个 NSDictionary 而不是 NSMutableDictionary。