Improve pin

src/app/shared/pin/pin.page.ts

@@ -7,9 +7,21 @@ import { Component, OnInit } from '@angular/core';
 })
 export class PinPage implements OnInit {
 
+  code = []
   constructor() { }
 
   ngOnInit() {
   }
 
+  setCode(code: string) {
+    if(this.code.length < 4) {
+      this.code.push(code)
+    }
+    
+  }
+
+  clearCode(){
+    this.code =[]
+  }
+
 }