I've heard a number of similar questions for other languages, but I'm looking for a specific scenario.
我也听说过很多其他语言的类似问题，但我正在寻找一个特定的场景。
My app has a Core Data model called "Record", which has a number of columns/properties like "date, column1 and column2". To keep the programming clean so I can adapt my app to multiple scenarios, input fields are mapped to a Core Data property inside a plist (so for example, I have a string variable called "dataToGet" with a value of 'column1'.
我的应用程序有一个名为“Record”的核心数据模型，它有一些列/属性，比如“日期，column1和column2”。为了保持编程的整洁，以便使我的应用程序适应多种场景，输入字段被映射到plist中的一个核心数据属性(例如，我有一个名为“dataToGet”的字符串变量，值为“column1”。
How can I retrieve the property "column1" from the Record class by using the dataToGet variable?
如何使用dataToGet变量从Record类检索属性“column1”?
1 个解决方案
#1
80
The Key Value Coding mechanism allows you to interact with a class's properties using string representations of the property names. So, for example, if your Record class has a property called column1, you can access that property as follows:
键值编码机制允许您使用属性名的字符串表示与类的属性进行交互。例如，如果您的记录类有一个名为column1的属性，您可以访问该属性如下:
NSString* dataToGet = @"column1";
id value = [myRecord valueForKey:dataToGet];
You can adapt that principle to your specific needs.
你可以根据自己的具体需要调整这一原则。
#1
80
The Key Value Coding mechanism allows you to interact with a class's properties using string representations of the property names. So, for example, if your Record class has a property called column1, you can access that property as follows:
键值编码机制允许您使用属性名的字符串表示与类的属性进行交互。例如，如果您的记录类有一个名为column1的属性，您可以访问该属性如下:
NSString* dataToGet = @"column1";
id value = [myRecord valueForKey:dataToGet];
You can adapt that principle to your specific needs.
你可以根据自己的具体需要调整这一原则。