//建立UIAlertController
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {}];
    [alert addAction:defaultAction];

    //Message排版
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.alignment = NSTextAlignmentCenter;
    //Message1 置中
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:@"Message1" attributes:@{NSParagraphStyleAttributeName:paragraphStyle}];
    NSMutableParagraphStyle *mParagraphStyle = [[NSMutableParagraphStyle alloc] init];
    mParagraphStyle.alignment = NSTextAlignmentLeft;
    //Message2 靠左
    NSMutableAttributedString *message = [[NSMutableAttributedString alloc] initWithString:@"\nMessage2-1\nMessage2-2\nMessage2-3\nMessage2-4" attributes:@{NSParagraphStyleAttributeName:mParagraphStyle}];
    [attributedStr appendAttributedString:message];
    [alert setValue:attributedStr forKey:@"attributedMessage"];

    [self presentViewController:alert animated:YES completion:nil];