ios - Swift 3.0 Delegate Protocol doesn't work -

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i have made delegate protocol within 2 view controllers. delegate method doesn't call on code snippet. reason that. couldn't find out issue kindly post suggestions relive issue.

main view controller

class viewcontroller: uiviewcontroller, testdelegatemethod {  override func viewdidload() {     super.viewdidload()      let vw = testviewcontroller()     vw.delegatetest = self      let push = self.storyboard?.instantiateviewcontroller(withidentifier: "testviewcontroller")     self.navigationcontroller?.pushviewcontroller(push!, animated: true) }  func testmethod(value:string) {     print("hai", value) } }

sub view controller

protocol testdelegatemethod { func testmethod(value:string) }  class testviewcontroller: uiviewcontroller { var delegatetest : testdelegatemethod?  override func viewdidload() {     super.viewdidload() }  @ibaction func actsubmit(_ sender: any) {     delegatetest?.testmethod(value: "hello how you!") }  }

update these changes in viewdidload() method 

override func viewdidload() {     super.viewdidload()     if let push = self.storyboard?.instantiateviewcontroller(withidentifier: "testviewcontroller") as? selectionscreen   {     push.delegatetest = self   }  }




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