Javascript 角度指令是否需要自己的控制器？

这是一个简单的问题，但我似乎找不到任何相关的文档

我试图找出angular指令是否既可以继承父控制器，也可以继承自己的控制器。考虑下面的例子：

简单的自我继承

app.directive('screen', function() {
  return {
    scope: true,
    controller: function() {
        this.doSomething = function() {

        };
    },
    link: function($scope, el, attrs, ctrl) {
        // ctrl now contains `doSomething`
    }
  }
});

从父项继承

app.directive('screen', function() {
  return {
    scope: true,
    controller: function() {
        this.doSomething = function() {

        };
    }
  }
});
app.directive('widget', function() {
  return {
    scope: true,
    require: '^screen',
    link: function($scope, el, attrs, ctrl) {
        // ctrl now contains `doSomething` -- inherited from the `screen` directive
    }
  }
});

甚至还有多重继承…

app.directive('screen', function() {
  return {
    scope: true,
    controller: function() {
        this.doSomething = function() {

        };
    }
  }
});
app.directive('widget', function() {
  return {
    scope: true,
    require: ['^screen','^anotherParent'],
    link: function($scope, el, attrs, ctrl) {
        // ctrl[0] now contains `doSomething` -- inherited from the `screen` directive
        // ctrl[1] now contains the controller inherited from `anotherParent`
    }
  }
});

我不明白的是如何使指令同时继承父控制器和它自己的控制器。像这样：

app.directive('screen', function() {
  return {
    scope: true,
    controller: function() {
        this.doSomething = function() {

        };
    }
  }
});
app.directive('widget', function() {
  return {
    scope: true,
    require: '^screen',
    controller: function($scope) {
       // isolated widget controller
    },
    link: function($scope, el, attrs, ctrl) {
        // I need the `screen` controller in ADDITION to the isolated widget controller accessible in the link
    }
  }
});

---

这是可能的/正确的形式吗（或者是某种我不知道的反模式）？

事实证明，这比我想象的要明显得多。。。一点尝试和错误表明，指令实际上也可以要求自己

继承父级+本地控制器的正确方法似乎是：

app.directive('screen', function() {
  return {
    scope: true,
    controller: function() {
        this.doSomething = function() {

        };
    }
  }
});
app.directive('widget', function() {
  return {
    scope: true,
    require: ['^screen','widget'],
    controller: function($scope) {
       this.widgetDoSomething = function() {
       };
    },
    link: function($scope, el, attrs, ctrl) {
        // ctrl[0] contains the `screen` controller
        // ctrl[1] contains the local `widget` controller
    }
  }
});

---

我现在就是这么做的。。。我的搜索是希望发现一种更“优雅”的方法。我猜就是这样做的=/我很高兴你问了这个问题，我花了很长时间才弄明白。为什么你需要^screen指令？