Cocoa - Determining a class' properties at run time

Is this simple? I'm actually trying to monitor if an object changes (to determine if I should save it). Currently I just have an array in the object with a list of all of it's readwrite properties, then I loop through it after the object is created and add observers:

for ( NSString *observer in _开发者_如何学Pythonobservers ){
    [self addObserver: self forKeyPath: observer options: NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context: nil];
}

It works, but if you forget to add a property to the array, obviously the observer won't be called. Does anyone know how I can just determine the object's properties at runtime? I was thinking it may be around respondsToSelector: but I haven't been able to find much on the subject.

Thanks in advance!

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Properties of an object, after they have been synthesized, behave almost like ordinary object's methods, so you can do following check

if ([myObject respondsToSelector: @selector(propertyName)]) {
    // your code here
}

Or if you want to use strings as selector's name:

if ([myObject respondsToSelector: NSSelectorFromString(@"propertyName")]) {
    // your code here
}

Here propertyName is a getter (it's signature name exactly corresponds to your declared property name), so if you want to check for setter presence, you should add additional expression:

[myObject respondsToSelector: @selector(setPropertyName:)])

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May be this will help:

You can get list of properties in a class using class_copyPropertyList

objc_property_t * class_copyPropertyList(Class cls, unsigned int *outCount)

and then from each property you can get its name using property_getName function and attributes using property_getAttributes function (if you need to filter read-write properties).

For more details see Objective-c Runtime Reference