iOS

来源：互联网发布：2016东华理工行知分院编辑：程序博客网时间：2024/06/06 02:43

把代理写进一个类里面，这个类.h不声明，所以.m也就不用实现。既然不实现，那留着它也就无意义了，所以，我把它删了。

流程就是这样： viewController-->FirstViewController-->SecondViewController,其中返回的过程中，Second 会传值给 First, 而 First 则会给 ViewController 传值。依次看代码就好:

// ZJJPassTheNumberDelegate.h

// ProjectZJJ

// Created by ZJJ on 2017/8/4.

#import <Foundation/Foundation.h>

@protocol ZJJPassTheNumberDelegate <NSObject>

- (void)passTheNumberWithNum:(int)num;

@end

// ViewController.h

// ProjectZJJ

// Created by ZJJ on 2017/8/3.

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

// Created by ZJJ on 2017/8/3.

#import "ViewController.h"

#import "FirstViewController.h"

@interface ViewController () <ZJJPassTheNumberDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {

[superviewDidLoad];

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

self.view.backgroundColor = [UIColorcyanColor];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

FirstViewController *first = [[FirstViewControlleralloc] init];

first.delegate =self;

[selfpresentViewController:firstanimated:YEScompletion:nil];

}

- (void)passTheNumberWithNum:(int)num {

NSLog(@"第一个类传过来的值为:%d",num);

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

// FirstViewController.h

// ProjectZJJ

// Created by ZJJ on 2017/8/4.

#import <UIKit/UIKit.h>

#import "ZJJPassTheNumberDelegate.h"

@interface FirstViewController :UIViewController

@property (nonatomic,assign) id <ZJJPassTheNumberDelegate> delegate;

@end

// FirstViewController.m

// ProjectZJJ

// Created by ZJJ on 2017/8/4.

#import "FirstViewController.h"

#import "SecondViewController.h"

@interface FirstViewController () <ZJJPassTheNumberDelegate>

@end

@implementation FirstViewController

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColorwhiteColor];

UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];

button.frame =CGRectMake(100,100, 100,50);

button.backgroundColor = [UIColorcyanColor];

[button setTitle:@"返回"forState:UIControlStateNormal];

[button setTitleColor:[UIColoryellowColor] forState:UIControlStateNormal];

[button addTarget:selfaction:@selector(back)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

- (void)back {

if ([self.delegaterespondsToSelector:@selector(passTheNumberWithNum:)]) {

[self.delegatepassTheNumberWithNum:10];

}

[selfdismissViewControllerAnimated:YEScompletion:nil];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

SecondViewController *second = [[SecondViewControlleralloc] init];

second.protocal =self;

[selfpresentViewController:secondanimated:YEScompletion:nil];

}

- (void)passTheNumberWithNum:(int)num {

NSLog(@"第二个类传过来的值为:%d",num);

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

// SecondViewController.h

// ProjectZJJ

// Created by ZJJ on 2017/8/4.

#import <UIKit/UIKit.h>

#import "ZJJPassTheNumberDelegate.h"

@interface SecondViewController :UIViewController

@property (nonatomic,assign) id <ZJJPassTheNumberDelegate> protocal;

@end

// SecondViewController.m

// ProjectZJJ

// Created by ZJJ on 2017/8/4.

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColorlightGrayColor];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

if ([self.protocalrespondsToSelector:@selector(passTheNumberWithNum:)]) {

[self.protocalpassTheNumberWithNum:100];

}

[selfdismissViewControllerAnimated:YEScompletion:nil];

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

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