iOS 传值

一、属性传值（省略）

二、代理传值 RootViewController <- FirstViewController

RootViewController界面代码：

.m文件#import "RootViewController.h"#import "FirstViewController.h"@interface RootViewController ()
    
     //第四步@end-(void)buttonAction:(UIButton *)sender{    FirstViewController *fvc = [[FirstViewController alloc]init];    fvc.delegate = self;//第五步    fvc.text = self.textField.text;    [self.navigationController pushViewController:fvc animated:YES];}-(void)sendValue:(NSString *)str{//第六步    self.textField.text = str;}
    

FirstViewController界面代码：

.h文件#import 
    
     @protocol FirstViewControllerDelegate 
     
      //第一步//协议方法-(void)sendValue:(NSString *)str;@end@interface FirstViewController : UIViewController@property (nonatomic,assign)id
      
        delegate;//第二步@end.m文件-(void)buttonAction:(UIButton *)sender{//第三步    if ([self.delegate respondsToSelector:@selector(sendValue:)]) {        [self.delegate sendValue:self.textField.text];    }    [self.navigationController popToRootViewControllerAnimated:YES];}
      
     
    

三、Block传值   RootViewController <- FirstViewController

RootViewController界面代码：

-(void)buttonAction:(UIButton *)sender{    FirstViewController *fvc = [[FirstViewController alloc]init];    [fvc sendText:^(NSString *str) {//第六步        self.textField.text = str;    }];    [self.navigationController pushViewController:fvc animated:YES];}

FirstViewController界面代码：

FirstViewController.h#import 
    
     typedef void(^SENDBLOCK)(NSString *str);//第一步@interface FirstViewController : UIViewController@property (nonatomic,copy)SENDBLOCK block;//第二步-(void)sendText:(SENDBLOCK)block;//第三步@endFirstViewController.m-(void)buttonAction:(UIButton *)sender{    if (self.block != nil) {//第四步        self.block(self.textField.text);    }    [self.navigationController popToRootViewControllerAnimated:YES]; }-(void)sendText:(SENDBLOCK)block{//第五步    self.block = block;}
    

RootViewController界面代码：

.m#import "RootViewController.h"#import "FirstViewController.h"#import "DataManager.h"@interface RootViewController ()@end@implementation RootViewController-(void)viewWillAppear:(BOOL)animated{   self.textField.text = [DataManager shareDataManager].text;}-(void)buttonAction:(UIButton *)sender{    [DataManager shareDataManager].text = self.textField.text;        FirstViewController *fvc = [[FirstViewController alloc]init];    [self.navigationController pushViewController:fvc animated:YES];}

FirstViewController界面代码：

#import "FirstViewController.h"#import "DataManager.h"@interface FirstViewController ()@end@implementation FirstViewController-(void)viewWillAppear:(BOOL)animated{    self.textField.text = [DataManager shareDataManager].text;}-(void)buttonAction:(UIButton *)sender{    [DataManager shareDataManager].text = self.textField.text;        [self.navigationController popToRootViewControllerAnimated:YES];}

DataManager 单例类代码：

.h文件#import 
    
     @interface DataManager : NSObject@property (nonatomic,strong)NSString *text;+(instancetype)shareDataManager;@end.m文件#import "DataManager.h"static DataManager *_dataManager = nil;@implementation DataManager+(instancetype)shareDataManager{    return [[self alloc]init];}+(instancetype)allocWithZone:(struct _NSZone *)zone{    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        if (_dataManager == nil) {            _dataManager = [super allocWithZone:zone];        }    });    return _dataManager;}@end
    

五、通知传值

RootViewController 界面代码：

.m 文件-(void)dealloc{//移除通知[[UIApplication sharedApplication] cancelAllLocalNotifications];}- (void)viewDidLoad {     //注册通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(postNotification:) name:@"Notification" object:nil];}//实现通知方法-(void)postNotification:(NSNotification *)sender{    self.view.backgroundColor = [UIColor grayColor];}

FirstViewCOntroller 界面代码：

.m 文件#import "FirstViewController.h"@interface FirstViewController ()@end@implementation FirstViewController-(void)buttonAction:(UIButton *)sender{    //发送通知    [[NSNotificationCenter defaultCenter] postNotificationName:@"Notification" object:nil];        [self.navigationController popToRootViewControllerAnimated:YES];}