Question

我今天在Unity3D中创建了一个简单的场景，玩家可以通过碰撞到墙壁来选择颜色，这会将玩家的标签更改为“RedPlayer”，“BluePlayer”等;并在调试日志上打印出“他是个红色男孩！”，或者玩家选择的任何内容。然而，在我添加最后一个墙（WhitePlayer）之前，一切都工作正常，并且每个墙都将玩家的标签更改为WhitePlayer，但它仍然会打印出与之碰撞的墙的颜色。

using UnityEngine;
using System.Collections;


public class ColourChoice : MonoBehaviour
{

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.tag == "RedCollision")
            Debug.Log("He's a Red Boy!");
        gameObject.tag = "RedPlayer";

        if (other.gameObject.tag == "YellowCollision")
            Debug.Log("He's a Yellow Boy!");
        gameObject.tag = "YellowPlayer";

        if (other.gameObject.tag == "BlueCollision")
            Debug.Log("He's a Blue Boy!");
        gameObject.tag = "BluePlayer";

        if (other.gameObject.tag == "GreyCollision")
            Debug.Log("He's a Grey Boy!");
        gameObject.tag = "GreyPlayer";

        if (other.gameObject.tag == "GreenCollision")
            Debug.Log("He's a Green Boy!");
        gameObject.tag = "GreenPlayer";

        if (other.gameObject.tag == "MaroneCollision")
            Debug.Log("He's a Marone Boy!");
        gameObject.tag = "MaronePlayer";

        if (other.gameObject.tag == "PurpleCollision")
            Debug.Log("He's a Purple Boy!");
        gameObject.tag = "PurplePlayer";

        if (other.gameObject.tag == "OrangeCollision")
            Debug.Log("He's a Orange Boy!");
        gameObject.tag = "OrangePlayer";

        if (other.gameObject.tag == "WhiteCollision")
            Debug.Log("He's a White Boy!");
        gameObject.tag = "WhitePlayer";
    }
}

我已将代码包含在此处，希望有人能够弄明白。如果我能解释如何解决这个问题，那就太棒了。

谢谢，马特

Answer 1

在添加if代码检查之前，您的代码已经很糟糕了。这是新程序员的典型错误。

在每个Debug.Log语句后没有打开和关闭括号，if只有在true语句为if时才会运行。 Debug.Log下的其他代码将执行，无论其上面的if语句是否为真。

如果您想要执行多行代码，则必须将true语句代码放在花括号{}中if (other.gameObject.tag == "RedCollision") Debug.Log("He's a Red Boy!"); gameObject.tag = "RedPlayer";的内容中。

所以

if (other.gameObject.tag == "RedCollision"){
    Debug.Log("He's a Red Boy!");
    gameObject.tag = "RedPlayer";
}

应该是

if (other.gameObject.CompareTag("RedCollision"))

对代码中的每个if语句执行此操作。

Tom改进了您的代码，使用tags来比较function printschedule(WhichSheet) { var spreadsheet = SpreadsheetApp.getActiveSpreadsheet(); var objToSheetName = {"1":"Schedule 1","2":"Schedule 2","3":"Schedule 3"}; var whichSheetToPDF = objToSheetName[WhichSheet]; var ui = SpreadsheetApp.getUi(); var prompt = ui.prompt('Send to which Email Address?'); var email = prompt.getResponseText(); var ss = SpreadsheetApp.getActiveSpreadsheet(); SpreadsheetApp.setActiveSheet(ss.getSheetByName(whichSheetToPDF)); var sheet = ss.getActiveSheet(); var subject = "Schedules"; var body = ""; var url = "https://docs.google.com/spreadsheets/d/SS_ID/export?".replace("SS_ID", ss.getId()); var url_ext = 'exportFormat=pdf&format=pdf' // export as pdf / csv / xls / xlsx + '&size=letter' // paper size legal / letter / A4 + '&portrait=true' // orientation, false for landscape + '&fitw=true&source=labnol' // fit to page width, false for actual size + '&sheetnames=false&printtitle=false' // hide optional headers and footers + '&pagenumbers=false&gridlines=false' // hide page numbers and gridlines + '&fzr=true' // repeat row headers (frozen rows) on each page + '&gid='; // the sheet's Id var token = ScriptApp.getOAuthToken(); var response = UrlFetchApp.fetch(url + url_ext + sheet.getSheetId()).getBlob().setName('Namexyz'); if (MailApp.getRemainingDailyQuota() > 0) GmailApp.sendEmail(email, subject, body, { attachments:response, }); };。

Answer 2

问题是你的if没有大括号（OnTriggerEnter）。在gameObject.tag = "WhitePlayer";函数中运行的最后一行代码是WhiteCollision

Answer 3

尽管非常干净，但你不能在“简短陈述”中写出两行代码if

请注意，您没有{}附上两行 then？你不能那样做。简短或简短陈述仅适用于一行和一行。大多数时候看上去都很好，但如果你收到错误并且在调试这些错误时没有将它包含在“正确的”if语句中，那么它就会非常浪费。

要回答您的问题，请更改：

if (other.gameObject.tag == "RedCollision")
  Debug.Log("He's a Red Boy!");
    gameObject.tag = "RedPlayer";

要：

if (other.gameObject.tag == "RedCollision") {
    Debug.Log("He's a Red Boy!");
    gameObject.tag = "RedPlayer";
}

如果你惹人注意的话，总是正确缩进你的东西。

对此进行测试：

if( X != 1 )
    Debug.Log( "1" );
    if( X == 2 )
        Debug.Log( "2" );
    else
        Debug.Log( "3" );

和

if( X != 1 )
    Debug.Log( "1" );
    if( X == 2 )
        Debug.Log( "2" );
   else
        Debug.Log( "3" );

注意一个空格差异

感谢此Python-ian缩进类型，如果您的X等于2，则顶部示例将记录"1"，然后记录"2"，而底部将记录"3"

Unity3D C＃：OnTriggerEnter设置为只有一个标签？

3 个答案: