Iterate properties snippet

modeltest.m

const char *property_getTypeString( objc_property_t property ) {
    const char * attrs = property_getAttributes( property );
    if ( attrs == NULL )
        return ( NULL );

    static char buffer[256];
    const char * e = strchr( attrs, ',' );
    if ( e == NULL )
        return ( NULL );

    int len = (int)(e - attrs);
    memcpy( buffer, attrs, len );
    buffer[len] = '\0';

    return ( buffer );
}

/**
 *  Validate Properties iterates overall all the properties of the given object and ensures that all
 *  populated values are the correct property type and are not null
 */
- (void)validateProperties:(id)object {
    Class cls = [object class];

    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList(cls, &outCount);
    for (i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        fprintf(stdout, "%s %s\n", property_getName(property), property_getTypeString(property));
        NSString *propertyName = [NSString stringWithUTF8String:property_getName(property)];
        NSString *propertyType = [NSString stringWithUTF8String:property_getTypeString(property)];
        propertyType = [propertyType substringWithRange:NSMakeRange(3, propertyType.length - 4)];
        id value = [object valueForKey:propertyName];
        Class foundClass = NSClassFromString(propertyType);
        XCTAssertTrue([value isKindOfClass:foundClass],
                      @"Expected value of %@ to be of type %@, but found %@!", propertyName, propertyType,
                      NSStringFromClass([value class]));
    }
    free(properties);
}