在 Objective-C 中，我使用以下代码将自定义类序列化为工作正常的字典。为了熟悉 Swift，将 Objective-C 代码移植到 Swift。但是我无法实现这一目标，如何使用 Swift 实现这一目标？

这就是我用 Objective-C 实现的方式

.h
#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface NSObject (aClass_NSDictionary)
- (NSDictionary *)NSDictionaryFromClass;
@end

.m
@implementation NSObject (aClass_NSDictionary)

- (NSDictionary *)NSDictionaryFromClass {

    Class aClass = [self class];
    u_int propertiesCount;

    objc_property_t *propertiesInAClass = class_copyPropertyList(aClass, &propertiesCount);

    NSMutableDictionary *propertiesDictionary = [[NSMutableDictionary alloc] initWithCapacity:propertiesCount];

    for (int i = 0; i < propertiesCount; i++)
    {
        NSString *strAKey = [NSString stringWithCString:property_getName(propertiesInAClass[i])
                                               encoding:NSUTF8StringEncoding];

        [propertiesDictionary setValue:[self valueForKey:strAKey]
                                forKey:strAKey];
    }
    free(propertiesInAClass);
    return propertiesDictionary;
}
@end

当我在 swift 中编写相同的代码时，我无法找出与 [self class] 等价的代码。

class class2dicti : NSObject {

    class func nsdictionaryFromAClass() -> NSDictionary {

        let aClass = self.classForCoder
        var propertiesCount : u_int
        let propertiesInAClass : objc_property_t = class_copyPropertyList(aClass, &propertiesCount)

        //return NSDictionary()
    }
}

更新

到目前为止我已经尝试过:

    let aClass = self.classForCoder
    var propertiesCount : u_int
    let propertiesInAClass : objc_property_t = class_copyPropertyList(aClass, &propertiesCount)

和

let aClass : AnyClass! = self.classForCoder()

没有成功，仍然是相同的编译器错误“找不到接受提供的参数的‘__conversion’的重载”

解决方案

关于下面的答案，我找到了这个解决方案并且有效。基本上我已经为我的类(class)创建了扩展。

class myClass : NSObject {
    var propertyOne = "prop One"
    var propertyTwo = [1, 2, 3]
    var propertyThree = ["A":1, "B":2, "C":3]
}

extension myClass {
    func toDictionary() -> NSDictionary {

        var aClass : AnyClass? = self.dynamicType
        var propertiesCount : CUnsignedInt = 0
        let propertiesInAClass : UnsafePointer<objc_property_t> = class_copyPropertyList(aClass, &propertiesCount)

        var propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

        for var i = 0; i < Int(propertiesCount); i++ {
            var strKey : NSString? = NSString(CString: property_getName(propertiesInAClass[i]), encoding: NSUTF8StringEncoding)
            propertiesDictionary.setValue(self.valueForKey(strKey), forKey: strKey)
        }
        return propertiesDictionary
    }
}

现在 let myclazz = myClass().toDictionary() 给我 NSDictionary。欢迎所有建议。

最佳答案

这就是我实现深度序列化的方式。

如果属性是 DictionarySerializedObject 则它被递归序列化。

要小心，因为 class_copyPropertyList() 不会返回可选的 Swift 类型的属性，例如 Bool?、[String?] 因为 Foundation 不会为他们提供桥梁。例如，它为 Bool 提供了到 NSNumber 的桥梁，但没有为 Bool? 提供桥梁。

import Foundation

protocol DictionarySerializable {
    func serializeToDictionary() -> [String:AnyObject]
}

class DictionarySerializableObject: NSObject {
}

extension NSObject: DictionarySerializable {
    func serializeToDictionary() -> [String:AnyObject] {
        var aClass: AnyClass? = self.dynamicType
        var propertiesCount: CUnsignedInt = 0
        let properties = class_copyPropertyList(aClass, &propertiesCount)
        var dictionary = [String: AnyObject]()
        for var i = 0; i < Int(propertiesCount); i++ {
            if let name = NSString(CString: property_getName(properties[i]), encoding: NSUTF8StringEncoding) as? String {
                dictionary[name] = getDictionaryValueForObject(self.valueForKey(name))
            }
        }
        free(properties)
        return dictionary
    }

    private func getDictionaryValueForObject(object: AnyObject?) -> AnyObject {
        if let object: AnyObject = object {
            if let object = object as? DictionarySerializableObject {
                return object.serializeToDictionary()
            } else if let object = object as? [AnyObject] {
                var array = [AnyObject]()
                for item in object {
                    array.append(getDictionaryValueForObject(item))
                }
                return array
            } else if let object = object as? NSData {
                return object.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(0))
            } else {
                return object
            }
        } else {
            return NSNull()
        }
    }
}

关于objective-c - 如何从类中序列化 NSDictionary - Swift 实现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24219179/