List of class properties in Objective-C

Question

Is there a way to get an array of class properties of certain kind? For example if i have interface like this

@interface MyClass : NSObject
    @property (st         


        

Answer 1

The solution of serhats is great unfortunately it doesn't work for iOS (as you mentioned) (and this question is tagged for iOS). A workaround would be to get a NSDictionary representation of the object and then access it normally as key-value pairs. I would recommend a category for NSObject:

Header-File:

@interface NSObject (NSDictionaryRepresentation)

/**
 Returns an NSDictionary containing the properties of an object that are not nil.
 */
- (NSDictionary *)dictionaryRepresentation;

@end

Implementation-File:

#import "NSObject+NSDictionaryRepresentation.h"
#import 

@implementation NSObject (NSDictionaryRepresentation)

- (NSDictionary *)dictionaryRepresentation {
    unsigned int count = 0;
    // Get a list of all properties in the class.
    objc_property_t *properties = class_copyPropertyList([self class], &count);

    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] initWithCapacity:count];

    for (int i = 0; i < count; i++) {
        NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];
        NSString *value = [self valueForKey:key];

        // Only add to the NSDictionary if it's not nil.
        if (value)
            [dictionary setObject:value forKey:key];
    }

    free(properties);

    return dictionary;
}

@end

Borrowed from this article: http://hesh.am/2013/01/transform-properties-of-an-nsobject-into-an-nsdictionary/

This way you could do something similar as serhats mentioned:

for (NSString *key in objectDic.allKeys) {
   if([objectDic[key] isKindOfClass:[UILabel  class]])
   {
       //put attribute to your array
   }
}