iOS--頁面間的代理傳值（屬性、代理（委託）、代碼塊、單例、通知），ios--頁面

iOS--頁面間的代理傳值（屬性、代理（委託）、代碼塊、單例、通知），ios--頁面
（一）屬性傳值 

 

 

（二）代理（委託）傳值 代理傳值 適用於  反向傳值 (從後往前傳) 1.1 建立協議 及協議方法 在反向傳值的頁面（SecondViewController）中
1.2 建立協議類型的屬性 在SecondViewController中建立屬性id<postValueDelegate> delegate
1.3 調用屬性 即delegate
在SecondViewController頁面中 對象傳值的方法中調用
[self.delegate postValue:self.textName.text];
1.4 在第一頁 即顯示修改過資訊的頁面
遵循協議 實現協議方法 指定代理對象（即 在頁面傳值參數的方法中為代理賦值）
secondVc.delegate=self；

檔案目錄：

FirstViewController.h

#import <UIKit/UIKit.h>#import "SecondViewController.h"@interface FirstViewController : UIViewController<UITextFieldDelegate,postValue>@property(strong,nonatomic) UITextField *textName;@property(strong,nonatomic) UIButton *nextbutton;@end

 

FirstViewController.m

#import "FirstViewController.h"@interface FirstViewController ()@end@implementation FirstViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor=[UIColor redColor];    self.textName=[[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200,50)];    self.textName.borderStyle=UITextBorderStyleLine;    self.textName.delegate=self;    [self.view addSubview:self.textName];        self.nextbutton=[[UIButton alloc] initWithFrame:CGRectMake(200, 200, 100, 50)];    [self.nextbutton setTitle:@"下一頁" forState:UIControlStateNormal];    self.nextbutton.backgroundColor=[UIColor grayColor];    [self.nextbutton addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:self.nextbutton];    }-(BOOL)textFieldShouldReturn:(UITextField *)textField{    if ([textField isFirstResponder]) {        [textField resignFirstResponder];    }        return YES;}-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self.textName resignFirstResponder];}-(void)nextPage{    SecondViewController *secondVc=[[SecondViewController alloc] init];    secondVc.str=self.textName.text;    secondVc.deletage=self;    [self presentViewController:secondVc animated:YES completion:nil];}-(void)postValue:(NSString *)str{    self.textName.text=str;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

 

SecondViewController.h

#import <UIKit/UIKit.h>

  // 建立協議

@protocol postValue <NSObject>-(void)postValue:(NSString *)str;@end@interface SecondViewController : UIViewController<UITextFieldDelegate>@property(strong,nonatomic) UITextField *textInfo;@property(strong,nonatomic) UIButton *backbutton;@property(strong,nonatomic) NSString *str;@property(strong,nonatomic) id<postValue> deletage;@end

 

SecondViewController.m

#import "SecondViewController.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor=[UIColor colorWithRed:0.541 green:0.878 blue:0.831 alpha:1.000];        self.textInfo=[[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 50)];    self.textInfo.borderStyle=UITextBorderStyleLine;    self.textInfo.text=self.str;    self.textInfo.delegate=self;        [self.view addSubview:self.textInfo];        self.backbutton=[[UIButton alloc] initWithFrame:CGRectMake(100, 200, 100, 50)];    [self.backbutton setTitle:@"上一頁" forState:UIControlStateNormal];    self.textInfo.text=self.str;    [self.backbutton addTarget:self action:@selector(backPage) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:self.backbutton];    }-(BOOL)textFieldShouldReturn:(UITextField *)textField{    if ([textField isFirstResponder]) {        [textField resignFirstResponder];    }        return YES;}-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self.textInfo resignFirstResponder];}-(void)backPage{    if (self.deletage!=0) {        [self.deletage postValue:self.textInfo.text];    }        [self dismissViewControllerAnimated:YES completion:nil];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

 

AppDelegate.h

#import <UIKit/UIKit.h>#import"FirstViewController.h"@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@end

 

AppDelegate.m

#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    FirstViewController *firstVc=[[FirstViewController alloc] init];        self.window.rootViewController=firstVc;        return YES;}
.......

@end

 

（三）代碼塊傳值

 

（四）通知傳值

 

 

（五）單例傳值