iOS 过滤非法字符集

可以自己添加想要过滤的字符

- (BOOL)isHaveIllegalChar:(NSString *)str{    NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@":/,.?'\"[]{}（#%-*+=_）\\|~(＜＞$%^&*)_+ "];    NSRange range = [str rangeOfCharacterFromSet:doNotWant];    return range.location<str.length;}