iOS点滴记录

1.只能输入固定的字符

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    
      BOOL res = [QKValidateHelper validInputWithFixCharacter:@"0123456789" inputString:string];
    if (!res) {
        [MBProgressHUD showFlashTextInWindow:@"只能输入数字"];
        return NO;
    }
    return  YES;
}

/** 验证输入只能为固定的字符串 基本方法
 比如只能输入 "0123456789"
 */
+(BOOL)validInputWithFixCharacter:(NSString *)fixCharacter inputString:(NSString *)inputString{
    BOOL result = YES;
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:fixCharacter];
    int i = 0;
    while (i < inputString.length) {
        NSString * string = [inputString substringWithRange:NSMakeRange(i, 1)];
        NSRange range = [string rangeOfCharacterFromSet:tmpSet];
        if (range.length == 0) {
            result = NO;
            break;
        }
        i++;
    }
    return result;
}