快速动态创建对象并设置属性 [英] Dynamically create objects and set attributes in swift

问题描述

我正在研究一个自定义方案，其中我需要在运行时创建一个已定义类的对象，并为其设置属性.在Objective-C中这样的事情

I am looking into a custom scenario wherein I need to create a object of a defined class during the run time and set attributes to it as well. Something like this in objective-C

//The Model class

@interface Car:NSObject
{
  @property(nonatomic,copy) NSString * numberOfDoors;
  @property(nonatomic,copy) NSString * carModel;
  @property(nonatomic,copy) NSString * carMake;
  @property(nonatomic,copy) NSString * carBrand;

}

为上述类创建一个自定义运行时对象(不确定这是否正确，只是从我的脑海中说出来)

Creating a custom run time object for the above class (not sure whether this is right but just speaking from the top of my head)

id myNewObject =  [[NSClassFromString(@"Car") alloc]init];
[myNewObject setValue:@"4 doors" forKeyPath:@"numberOfDoors"];
[myNewObject setValue:@"Prius" forKeyPath:@"carModel"];
[myNewObject setValue:@"2014" forKeyPath:@"carMake"];
[myNewObject setValue:@"Toyota" forKeyPath:@"carBrand"];

因此，我的目的是创建一个对象映射模块，该模块将使用类名和对象映射信息，这些信息将描述如何从JSON响应中映射/创建模型对象(类似于RestKit减去核心数据)同步部分).

So my intention here is to create a object mapping module that would take the class name and a object mapping information that will describe how to map/create a model object from a JSON response (something very similar to RestKit minus the core data sync part).

我知道可以使用目标C来完成此操作，但不确定如何将它适用于Swift类

I know this can be done with objective C but not sure how this would be applicable to swift classes

感谢您的帮助.

推荐答案

我认为这就是您想要的:

I think that this is what you want:

@objc(MyClass)
class MyClass : NSObject {
    var someProperty = 0
}

let type = NSClassFromString("MyClass") as! NSObject.Type
let instance = type()
instance.setValue(12, forKey: "someProperty")

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