swift - 将 Swift 字典转换为 NSDictionary

Question

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。里面有个对象有属性

@property (nonatomic, retain) NSMutableDictionary *fields;

我正在尝试以这种方式分配它

object.fields = params

出现错误:

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

我也试过这样做

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

它编译的很好，但是我得到了运行时错误:

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

我打印了所有字段，但它们不是零:

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

...

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有什么想法吗？

Answer 1

试试 parms.bridgeToObjectiveC()。不过，这可能会给您一个 NSDictionary 而不是 NSMutableDictionary。