Ios has to use proxy to reverse pass the value

Ios has to use proxy to reverse pass the value

Application Scenario: sometimes jump from interface A to interface B, and interface B needs to pass the processing result to A when returning.

Implementation logic: 1. Define A coroutine for transferring values. Interface A has the coroutine attribute and implements the method in the coroutine.

2. Interface B also has this attribute (the proxy requires both of them to have references to the same object), and then obtains the reference pointer of interface A when returning, in addition, specify the call target in B as A, and call the value passing method in B.

Code:

Header file of:

# Import

@ Protocol passValueDelegate

-(Void) setValue :( NSString *) param;

@ End

@ Interface ViewController: UIViewController

@ Propertyid PassValueDelegate;

@ End

Implementation file of:

# Import "ViewController. h"

# Import "ViewController2.h"

@ InterfaceViewController ()

{

}

@ End

@ Implementation ViewController

-(Void) viewDidLoad

{

[SuperviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

UIButton * btn = [UIButtonbuttonWithType: UIButtonTypeRoundedRect];

Btn. frame = CGRectMake (100,100,200, 40 );

[Btn setTitle: @ "btn" forState: UIControlStateNormal];

[Btn addTarget: selfaction: @ selector (btn) forControlEvents: UIControlEventTouchUpInside];

[Self. viewaddSubview: btn];

Self. view. backgroundColor = [UIColorredColor];

}

-(Void) setValue :( NSString *) param {

NSLog (@ "pass value is: % @", param );

}

-(Void) btn

{

[Self. navigationController pushViewController: [[ViewController2 alloc] init] animated: YES];

}

-(Void) didReceiveMemoryWarning

{

[Super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@ End

Header file B:

# Import

@ Interface ViewController2: UIViewController

@ End

B's implementation file:

# Import "ViewController2.h"

# Import "ViewController. h"

@ InterfaceViewController2 ()

@ Propertyid PassValueDelegate;

@ End

@ Implementation ViewController2

-(Void) viewDidLoad

{

[SuperviewDidLoad];

UIButton * btn = [UIButtonbuttonWithType: UIButtonTypeRoundedRect];

Btn. frame = CGRectMake (100,100,200, 40 );

[Btn setTitle: @ "back" forState: UIControlStateNormal];

[Btn addTarget: selfaction: @ selector (btn) forControlEvents: UIControlEventTouchUpInside];

[Self. viewaddSubview: btn];

}

-(Void) btn

{

// NSLog (@ "% @", self. navigationController. childViewControllers [0]);

Self. passValueDelegate = self. navigationController. childViewControllers [0];

[Self. navigationControllerpopToRootViewControllerAnimated: YES];

[Self. passValueDelegatesetValue: @ "123456789"];

}

-(Void) didReceiveMemoryWarning

{

[SuperdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@ End