iphone - Objective-c：设置动态属性

Question

我有一个函数，它接收一个对象、一个属性的名称及其值。我可以像这样简单地设置对象的属性吗：

-(void)dynamicSetterWithProperty:(NSString*)propertyThatIsKnownOnlyInRuntime
                        andValue:(NSString*)valueThatIsKnownOnlyInRuntime{

       _myObject.propertyNameThatIsKnownOnlyInRuntime = valueNameThatIsKnownOnlyInRuntime;

}

还是我必须以这种丑陋的方式来做：

-(void)dynamicSetterWithProperty:(NSString*)propertyThatIsKnownOnlyInRuntime
                        andValue:(NSString*)valueThatIsKnownOnlyInRuntime{

       if([propertyNameThatIsKnownOnlyInRuntime isEqualToString@"name"]){
              _myObject.name = valueNameThatIsKnownOnlyInRuntime;
       }

       else if([propertyNameThatIsKnownOnlyInRuntime isEqualToString@"age"]){
              _myObject.age = valueNameThatIsKnownOnlyInRuntime;
       }

}

Answer 1

好吧，您可以使用KVC：

[_myObject setValue:runtimeValue forKey:runtimeProperty];

当然，您可以先检查属性是否有效，respondsToSelector或者通过覆盖valueForUndefinedKey:和setValue:forUndefinedKey:在您的子类中捕获任何无效消息。