Question

I have an Object: aObject, it has properties a,b,c.

I can access the properties using:

aObject.a

aObject.b

aObject.c

Is it possible to access all properties of the object using id? such as

[aObject indexOf:0]
[aObject indexOf:1]
[aObject indexOf:2]

or something likes that.

Welcome any comment

Answer 1

KVC (Key Value Coding) will allow you to set values of properties using the method [anObject setValue:aValue forKey:@"a"].

If you truly want to iterate through each property, setting its value, then you will need to drop down to the objective-c runtime.

unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList([anObject class], &outCount);
for (i = 0; i < outCount; i++) {
    objc_property_t property = properties[i];
    const char * name = property_getName(property);

    [anObject setValue:anyValue forKey:[NSString stringWithUTF8String:name]];
}
free(properties);