Pass value for IOS-pass value by proxy, block, nsicationicationcenter, nsicationicationcenter

Pass value for IOS-pass value by proxy, block, nsicationicationcenter, nsicationicationcenter

1. Use a proxy to transmit values, that is, use a proxy to communicate.

Interface file:

# Import <Foundation/Foundation. h>

 

@ Protocol Cdelegate <NSObject>

 

-(Void) change :( NSString *) name;

 

 

 

@ End

 

. H file

 

@ Interface ViewController: UIViewController <Cdelegate>

 

. M file

-(IBAction) pushBB :( id) sender {

BViewController * bc = [[BViewController alloc] initWithNibName: @ "BViewController" bundle: [NSBundle mainBundle];

Bc. delegate = self;

[Self presentViewController: bc animated: YES completion: nil];

 

}

 

BViewController File

. H file

# Import "ViewController. h"

# Import "Cdelegate. h"

 

 

@ Interface BViewController: ViewController

 

@ Property (weak, nonatomic) IBOutlet UITextField * name;

@ Property (nonatomic, assign) id <Cdelegate> delegate;

@ Property (nonatomic, copy) ablock block;

-(IBAction) popBB :( id) sender;

@ End

 

. M file

-(IBAction) popBB :( id) sender {

[Self. delegate change: self. name. text];

[Self dismissViewControllerAnimated: YES completion: nil];

}

Ii. block Value Transfer

Typedef void (^ ablock) (NSString * str );

@ Property (nonatomic, copy) ablock block;

 

-(IBAction) popBB :( id) sender {

// [Self. delegate change: self. name. text];

Self. block (self. name. text );

[Self dismissViewControllerAnimated: YES completion: nil];

}

 

 

 

-(IBAction) pushBB :( id) sender {

BViewController * bc = [[BViewController alloc] initWithNibName: @ "BViewController" bundle: [NSBundle mainBundle];

Bc. block = ^ (NSString * str ){

Self. aname. text = str;

};

[Self presentViewController: bc animated: YES completion: nil];

 

}

 

3. Notification

 

NSDictionary * dic = [NSDictionary dictionaryWithObject: self. name. text forKey: @ "name"];

[[Nsicationcenter center defacenter center] postNotificationName: @ "changeText" object: self userInfo: dic];

 

-(Void) viewDidLoad {

[Super viewDidLoad];

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

 

[[Nsicationcenter center defacenter center] addObserver: self selector: @ selector (changeText :) name: @ "changeText" object: nil];

 

}