inline.h

// Returns true iff the string is non-nil and contains at least one non-whitespace character
CG_INLINE BOOL MVNonEmptyString(NSString * _Nullable string) {
    if([string isKindOfClass:NSAttributedString.class]) {
        string = ((NSAttributedString*)string).string;
    }
    NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    NSUInteger len = string.length;
    for (NSUInteger i = 0; i < len; i++) {
        unichar c = [string characterAtIndex:i];
        if (![whitespace characterIsMember:c]) {
            return YES;
        }
    }
    return NO;
}