iOS development--Proxy and block pass value

One, the method of the proxy transfer value

In 1.hehe1viewcontroller.h

#import <UIKit/UIKit.h>

@protocol hehe1viewcontrollerdelegate <NSObject>

-(void) Backvaluewith: (nsstring*) str;

@end

@interface Hehe1viewcontroller:uiviewcontroller

@property (nonatomic,weak) ID delegate;

@end

In 2.HEHE1VIEWCONTROLLER.M

#import "Hehe1ViewController.h"

@interface Hehe1viewcontroller ()

@property (Nonatomic,strong) Uitextfield *hehetextfield;

@end

@implementation Hehe1viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

Uitextfield *hehetextfield = [[Uitextfield alloc] Initwithframe:cgrectmake (20, 200, 300, 40)];

Self.hehetextfield = Hehetextfield;

Hehetextfield.backgroundcolor = [Uicolor Lightgraycolor];

[Self.view Addsubview:hehetextfield];

UIButton *button1 = [UIButton Buttonwithtype:uibuttontypesystem];

Button1.frame = CGRectMake (20, 250, 300, 50);

Button1.backgroundcolor = [Uicolor Orangecolor];

[Button1 settitle:@ "Back to VC" forstate:uicontrolstatenormal];

[button1 Settintcolor:[uicolor Whitecolor];

[Button1 addtarget:self Action: @selector (GOTOHEHE1) forcontrolevents:uicontroleventtouchupinside];

[Self.view Addsubview:button1];

}

-(void) GoToHehe1 {

NSLog (@ "hehe1 ...");

[_delegate BackValueWith:self.heheTextField.text];

[Self.navigationcontroller Popviewcontrolleranimated:yes];

}

@end

Second, block transmission value

In 1.hehe2viewcontroller.h

#import <UIKit/UIKit.h>

typedef void (^backvalue) (NSString *str);

@interface Hehe2viewcontroller:uiviewcontroller

@property (nonatomic,copy) Backvalue backvalue;

-(void) Returnstr: (backvalue) block;

@end

In 2.HEHE2VIEWCONTROLLER.M

#import "Hehe2ViewController.h"

@interface Hehe2viewcontroller ()

@property (Nonatomic,strong) Uitextfield *hehetextfield;

@end

@implementation Hehe2viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

Uitextfield *hehetextfield = [[Uitextfield alloc] Initwithframe:cgrectmake (20, 200, 300, 40)];

Self.hehetextfield = Hehetextfield;

Hehetextfield.backgroundcolor = [Uicolor Lightgraycolor];

[Self.view Addsubview:hehetextfield];

UIButton *button2 = [UIButton Buttonwithtype:uibuttontypesystem];

Button2.frame = CGRectMake (20, 250, 300, 50);

Button2.backgroundcolor = [Uicolor Orangecolor];

[Button2 settitle:@ "Back to VC" forstate:uicontrolstatenormal];

[Button2 Settintcolor:[uicolor Whitecolor];

[Button2 addtarget:self Action: @selector (GOTOHEHE2) forcontrolevents:uicontroleventtouchupinside];

[Self.view Addsubview:button2];

}

-(void) Returnstr: (backvalue) Block {

Self.backvalue = Block;

}

-(void) GoToHehe2 {

NSLog (@ "Hehe2 ...");

Self.backvalue (Self.heheTextField.text);

[Self.navigationcontroller Popviewcontrolleranimated:yes];

}

@end

Third, receive the value returned in the VIEWCONTROLLER.M

#import "ViewController.h"

#import "Hehe1ViewController.h"//delegate

#import "Hehe2ViewController.h"//block

#define Klsceenwidth Self.view.bounds.size.width

@interface Viewcontroller ()

@property (Nonatomic,strong) UILabel *label1;

@property (Nonatomic,strong) UILabel *label2;

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

UILabel *label1 = [[UILabel alloc] Initwithframe:cgrectmake (klSceenWidth-40, 30)];

Self.label1 = Label1;

[Self.view Addsubview:label1];

Delegate

UIButton *button1 = [UIButton Buttonwithtype:uibuttontypesystem];

Button1.frame = CGRectMake (klSceenWidth-40, 30);

Button1.backgroundcolor = [Uicolor Orangecolor];

[Button1 settitle:@ "Go to Hehe1" forstate:uicontrolstatenormal];

[button1 Settintcolor:[uicolor Whitecolor];

[Button1 addtarget:self Action: @selector (GOTOHEHE1) forcontrolevents:uicontroleventtouchupinside];

[Self.view Addsubview:button1];

Block

UILabel *label2 = [[UILabel alloc] Initwithframe:cgrectmake (klSceenWidth-40, 30)];

Self.label2 = Label2;

[Self.view Addsubview:label2];

UIButton *button2 = [UIButton Buttonwithtype:uibuttontypesystem];

Button2.frame = CGRectMake (klSceenWidth-40, 30);

Button2.backgroundcolor = [Uicolor Orangecolor];

[Button2 settitle:@ "Go to Hehe1" forstate:uicontrolstatenormal];

[Button2 Settintcolor:[uicolor Whitecolor];

[Button2 addtarget:self Action: @selector (GOTOHEHE2) forcontrolevents:uicontroleventtouchupinside];

[Self.view Addsubview:button2];

}

-(void) Backvaluewith: (nsstring*) str {

Self.label1.text = str;

}

-(void) GoToHehe1 {

Hehe1viewcontroller *hehevc1= [[Hehe1viewcontroller alloc] init];

Hehevc1.delegate = self;

[Self.navigationcontroller pushviewcontroller:hehevc1 Animated:yes];

}

-(void) GoToHehe2 {

Hehe2viewcontroller *hehevc2= [[Hehe2viewcontroller alloc] init];

[HeheVC2 returnstr:^ (NSString *str) {

Self.label2.text = str;

}];

[Self.navigationcontroller PUSHVIEWCONTROLLER:HEHEVC2 Animated:yes];

}

@end

iOS development--Proxy and block pass value