Runtime error: unable to resume activity. TypeError :this.callResume is not a function in nativescript angular2

Runtime error: unable to resume activity. TypeError :this.callResume is not a function in nativescript angular2

resume Event我不得不调用这个方法this.callResume()。当我调用该方法时出现运行时错误:

TypeError :this.callResume is not a function

我不知道如何从 lifecycle.I 中的 resume 方法中调用方法,在构造函数中放置了 resume 方法。

  constructor() {

  applicationOn(resumeEvent, function (args: ApplicationEventData) {


    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("Activity: " + args.android);

      this.callResume();

    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("UIApplication: " + args.ios);
     }
    });

}

  callResume():void{

  console.log("ResumeCalled", "Test");

  }

使用箭头函数符号 ()=> 而不是 function。将您的代码更改为以下内容:

constructor() {

  applicationOn(resumeEvent,  (args: ApplicationEventData) => {
    if (args.android) {
        // For Android applications, args.android is an android activity class.
        console.log("Activity: " + args.android);

      this.callResume();

    } else if (args.ios) {
        // For iOS applications, args.ios is UIApplication.
        console.log("UIApplication: " + args.ios);
     }
    });

}