Flexible Boolean String Parser

gistfile1.m

+ (BOOL)parseBooleanValueFromString:(NSString *)value defaultValue:(BOOL)defaultValue {

    if (!value) return defaultValue;
    
    if ([@[@"1", @"yes", @"on", @"true"] containsObject:[value lowercaseString]]) {
        return YES;
    }
    else if ([@[@"0", @"no", @"off", @"false"] containsObject:[value lowercaseString]]) {
        return NO;
    }
    
    return defaultValue;
}