使用QML在加载器中调用类

问题描述

其实我有这个代码：

 import "class1"
 import "class2"

 Item {
  id: myItem
  property variant myVar: 0;
  anchors.fill: parent;

  Component {
    id: compClass1
    class1 { id: class1ID
     anchors.fill: myItem;
    }
  }
  Component {
   id: compClass2
    class2 {
     anchors.fill: myItem;
    }
  }
  Loader { id: myLoader }

  function update() {
    switch(myID.myVar) {
      case 0:
        myLoader.sourceComponent = compClass1;
        classID.myFunction();
        break;

       case 1:
         myLoader.sourceComponent = compClass2;
         break;
    }
 }

}

当我想调用一个函数时，我得到一个错误的问题：TypeError：表达式的结果'class1ID.myFunction'[undefined]不是一个函数。

The problem when I want to call a function, I get an error :TypeError: Result of expression 'class1ID.myFunction' [undefined] is not a function.

PS：class'class1'has have a function called'myFunction（）'

P.S : the class 'class1' have already a function called 'myFunction()'

推荐答案

您需要使用 class1 函数在 Loader c>。下面是一个示例：

If you want to access your class1 function you need to use the item property on your Loader. Here is an example showing this:

    Rectangle {
     id: myItem
     width: 300
     height: 300
     color: "yellow"

     Component {
       id: compClass1
       Rectangle {
        id: class1ID
        color: "blue"
        width: myItem.width
        height: myItem.height
        function function1() {
          console.log("I am in class1");
        }
       }
     }
     Component {
      id: compClass2
       Rectangle {
        color: "red"
        width: myItem.width
        height: myItem.height
        function function1() {
          console.log("I am in class2");
        }
       }
     }
     Loader { id: myLoader }

     MouseArea {
       property int nbClicks: 0
       anchors.fill: parent
       onClicked: {
         if(nbClicks % 2 == 0 ) {
           myLoader.sourceComponent = compClass1;
         } else {
           myLoader.sourceComponent = compClass2;
         }
         myLoader.item.function1();
         nbClicks++;
       }
     }
   }

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