Method code block for parameter passing between IOS page and page value

code block values are passed from the back to the forward value

1. Declaration code block (SECONDXXX.H)

2. Declaring a code block type's properties (SecondXXX.h)

3. Calling code block (SECONDXXX.M)

4. Implementing code blocks (SECONDXXX.M)

#import <UIKit/UIKit.h>

#import "FirstViewController.h"

@interface Appdelegate:uiresponder <UIApplicationDelegate>

@property (Strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"

@interface Appdelegate ()

@end

@implementation Appdelegate

-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (nsdictionary *) launchOptions

{

Firstviewcontroller *first=[[firstviewcontroller alloc] init];

Self.window.rootviewcontroller=first;

return YES;

}

#import <UIKit/UIKit.h>

#import "SecondViewController.h"

@interface firstviewcontroller:uiviewcontroller<uitextfielddelegate>

@property (strong,nonatomic) Uitextfield *mytext;

@property (strong,nonatomic) UIButton *mybutton;

@end

#import "FirstViewController.h"

@interface Firstviewcontroller ()

@end

@implementation Firstviewcontroller

-(void) viewdidload

{

[Super Viewdidload];

Self.view.backgroundcolor=[uicolor colorwithpatternimage:[uiimage imagenamed:@ "44.jpg"];

Self. Mytext=[[uitextfield Alloc] Initwithframe:cgrectmake (100, 100, 200, 50)];

Self. mytext.borderstyle=1;

Self. mytext.delegate=self;

Self. Mytext.tintcolor=[uicolor Redcolor];

[Self.view addsubview:self. MyText];

Self. Mybutton=[[uibutton Alloc] Initwithframe:cgrectmake (150, 200, 100, 50)];

Self. Mybutton.backgroundcolor=[uicolor Redcolor];

[Self. MyButton settitle:@ "Next" forstate:uicontrolstatenormal];

[Self. MyButton addtarget:self Action: @selector (NextPage) forcontrolevents:uicontroleventtouchupinside];

[Self.view addsubview:self. MyButton];

}

-(void) NextPage

{

Secondviewcontroller *second=[[secondviewcontroller alloc] init];

Assigning the contents of a text box to a string

Second. Mystr=self. Mytext.text;

4. Implementing code block Display information

Second. myblock=^ (NSString *infor)

{

Self. Mytext.text=infor;

};

Skip to Next page

[Self presentviewcontroller:second animated:yes completion:

^{

NSLog (@ "Message delivery success");

}];

}

Hide keyboard

-(BOOL) Textfieldshouldreturn: (Uitextfield *) TextField

{

if ([TextField Isfirstresponder])

{

[TextField Resignfirstresponder];

}

return YES;

}

#import <UIKit/UIKit.h>

1. Declaration code block (SECONDXXX.H) forward value

typedef void (^postvalueblock) (NSString *infor);

#import "FirstViewController.h"

@interface secondviewcontroller:uiviewcontroller<uitextfielddelegate>

@property (strong,nonatomic) NSString *mystr;

@property (strong,nonatomic) Uitextfield *mytext;

2. Declaring a code block type's properties (SecondXXX.h)

@property (strong,nonatomic) Postvalueblock Myblock;

@end

#import "SecondViewController.h"

@interface Secondviewcontroller ()

@end

@implementation Secondviewcontroller

-(void) viewdidload

{

[Super Viewdidload];

Add a background map to the parent view

Self.view.backgroundcolor=[uicolor colorwithpatternimage:[uiimage imagenamed:@ "20130714160426_rPTnU.jpeg"];

Initialize text box

Self. Mytext=[[uitextfield Alloc] Initwithframe:cgrectmake (100, 100,200,50)];

Self. mytext.borderstyle=1;

Self. mytext.delegate=self;

Assigning a string to a text box

Self. Mytext.text=self. MyStr;

Add a text box on the parent view

[Self.view addsubview:self. MyText];

}

3. Methods for calling code blocks

-(BOOL) Textfieldshouldreturn: (Uitextfield *) TextField

{

3.1 Calling Block

if (self. Myblock)

{

Self. Myblock (self. Mytext.text);

}

3.2 Hide Keyboard

if ([TextField Isfirstresponder])

{

[TextField Resignfirstresponder];

}

3.3 Back to previous page

[Self Dismissviewcontrolleranimated:yes completion:

^{

NSLog (@ "Previous page");

}];

return YES;

}

Method code block for parameter passing between IOS page and page