使用 @Input 装饰器访问传递的数据

我有一个看起来像这样的子组件

子组件

@Component({
   selector: 'child-component',
   //TemplateUrl, Styles and Providers
})

export Class ChildComponent implements OnInit{
  @Input()
  arrayToGet; //An array that I want to pass from Parent to child

  ngOnInit(){
     console.log('The Array I got is ', this.arrayToGet); //Undefined, Tried even with setTimeout
  }

  //A bunch of methods to work with the array I get
}

父组件

@Component({
   selector: 'parent-component',
   template: '<div>
                <child-component [arrayToGet]="models"></child-component>
              </div>',
   //A bunch of Styles and Providers
})

export class ParentComponent{
   models;

   constructor(......){}

   ngOnInit(){
      //Get an array from a service assign to this.models;
   }
}  

问题是我无法执行任何操作arrayToGet在我的里面ChildComponent。但是我可以使用这些属性arrayToGet在我的里面ChildComponent的 HTML。

有什么想法吗？

每当尝试从以下位置传递数据时parent to child using @Input装饰器和传递数据当时不可用child初始化，更好用setter，而不是直接绑定到变量中child成分。使用setter每当父组件中的数据更新时，都会更新子组件变量。

export Class ChildComponent implements OnInit{
  arrayToGet; //An array that I want to pass from Parent to child

  ngOnInit(){
     console.log('The Array I got is ', this.arrayToGet); //Undefined, Tried even with setTimeout
  }

  @Input('arrayToGet')
  set _arrayToGet(data: Array) {
     this.arrayToGet = data;
     console.log(this.arrayToGet);
  }

  //A bunch of methods to work with the array I get
}