Is there a way to log all the property values of an Objective-C instance

Question

I was just wondering if there is a quick and easy way of printing out to the log all of the various values of the properties to my class for debugging purposes. Like I would lik

Answer 1

The current answers just show how to do it for properties. If you want every instance variable printed out you could do something like the below.

- (void)logAllProperties {
    unsigned int count;
    Ivar *ivars = class_copyIvarList([self class], &count);
    for (unsigned int i = 0; i < count; i++) {
        Ivar ivar = ivars[i];

        const char *name = ivar_getName(ivar);
        const char *type = ivar_getTypeEncoding(ivar);
        ptrdiff_t offset = ivar_getOffset(ivar);

        if (strncmp(type, "i", 1) == 0) {
            int intValue = *(int*)((uintptr_t)self + offset);
            NSLog(@"%s = %i", name, intValue);
        } else if (strncmp(type, "f", 1) == 0) {
            float floatValue = *(float*)((uintptr_t)self + offset);
            NSLog(@"%s = %f", name, floatValue);
        } else if (strncmp(type, "@", 1) == 0) {
            id value = object_getIvar(self, ivar);
            NSLog(@"%s = %@", name, value);
        }
        // And the rest for other type encodings
    }
    free(ivars);
}

Although I wouldn't particularly suggest doing this in practice, but if it's for debug purposes then that's fine. You could implement this as a category on NSObject and keep it lying around for use when debugging. If completed for all type encodings then it could make for a very nice little method.