Using block-pass values in iOS

Using this method to pass a value overrides the delegate. Concrete Example MainView.h

#import <UIKit/UIKit.h>

@interface Mainview:uiviewcontroller

{

Iboutlet uibutton* btn;

Iboutlet uilabel* labshow;

}

-(Ibaction) Push: (ID) sender;

@end

mainview.m

#import "MainView.h"

#import "SecondView.h"

@implementation Mainview

-(ID) Initwithnibname: (nsstring*) Nibnameornil Bundle: (nsbundle*) Nibbundleornil

{

self = [super Initwithnibname:nibnameornil Bundle:nibbundleornil];

if (self) {

}

return self;

}

-(void) didreceivememorywarning

{

[Superdidreceivememorywarning];

}

#pragma mark-view lifecycle

-(void) viewdidload

{

[Superviewdidload];

}

-(Ibaction) Push: (ID) sender

{

Secondview *s =[[secondview alloc] initwithblock:block_copy (^ (NSString *str) {

NSLog (@ "%@", str);

Labshow.text = str;

})];

[Self.navigationcontroller pushviewcontroller:s Animated:yes];

[s release];

}

-(void) viewdidunload

{

[Superviewdidunload];

}

-(BOOL) Shouldautorotatetointerfaceorientation: (uiinterfaceorientation) interfaceorientation

{

return (interfaceorientation = = uiinterfaceorientationportrait);

}

@end

Second.h

#import <UIKit/UIKit.h>

typedef void (^myblock) (nsstring*);

@interface Secondview:uiviewcontroller

{

Iboutlet Uitextfield*txtview;

Myblock my;

}

-(Ibaction) Back: (ID) sender;

-(ID) Initwithblock: (Myblock) str;

@end

Second.m

#import "SecondView.h"

@implementation Secondview

-(ID) Initwithblock: (myblock) str

{

self = [super init];

if (self)

{

My =str;

}

return self;

}

-(Ibaction) Back: (ID) sender

{

nsstring* s = txtview.text;

if (my)

{

my (s);

}

[Self.navigationControllerpopViewControllerAnimated:YES];

}

-(void) didreceivememorywarning

{

[Superdidreceivememorywarning];

}

-(void) dealloc{

Block_release (my);

[Super Dealloc];

}

#pragma mark-view lifecycle

-(void) viewdidload

{

[Superviewdidload];

}

-(void) viewdidunload

{

[Superviewdidunload];

}

-(BOOL) Shouldautorotatetointerfaceorientation: (uiinterfaceorientation) interfaceorientation

{

return (interfaceorientation = = uiinterfaceorientationportrait);

}

@end