Angular 2在自定义单选按钮中使用BehaviorSubject

服务:

import { Injectable } from '@angular/core';
import { BehaviorSubject} from 'rxjs/BehaviorSubject';
import {Subject} from 'rxjs/Subject';

@Injectable()
export class RadioButtonService {
  public Status_Subject: Subject<string> = new BehaviorSubject<string>('x;y');
  constructor() {
  }
  public setRadioChecked(instance: string, id: string ) {
    const key = instance + ';' + id;
    this.Status_Subject.next(key);
  }
}

export class RadioButtonComponent implements AfterViewInit, OnDestroy {
  @Input() id: string;
  @Input() instanceId: string;
  @Input() group: string;
  isdisabled = false;
  ischecked = false;
  subj: Subject<string>;
  constructor(private radSvc: RadioButtonService) {
    this.subj = this.radSvc.Status_Subject;
  }

  ngAfterViewInit() {
    this.subj.subscribe(
      (key) => {
        const parts = key.split(';');
        this.ischecked =  (key[0] !== this.instanceId || key[1] !== this.id ? false : true );
      }
    );
  }

  ClickEvent($event) {
    if (!this.isdisabled) {
      this.ischecked = !this.ischecked;
      this.radSvc.setRadioChecked(this.instanceId, this.id); // tell the world we got clicked
      // send to Store(instanceId, id, value);
    }
  }

AfterViewInit()初始化组件的主题(我认为),并等待服务调用。 当我点击一个单选按钮时,组件中会调用ClickEvent,我在服务中进入setRadioChecked函数,下一个(键)似乎会执行,但组件的AfterViewInit subscribe永远不会捕捉到它。

感谢您的帮助:-)