代理传值：

//  SendViewController.h#import 
      
       @protocol SendInFor 
       
        -(void)sendInForIdea:(NSString*)text;@end@protocol SendInForTwo 
        
         -(void)sender:(NSString*)text;@end@interface SendViewController : UIViewController
         
          @property(nonatomic,retain)id 
          
            delegate;@property(nonatomic,retain)id 
           
             delegateB;@property(nonatomic,retain)NSIndexPath*indexPath;@e代理
           
          
         
        
       
      

代理方法

#import "SendViewController.h"//代理传值@interface SendViewController (){    UITableView*table;    NSMutableArray*data;}@end@implementation SendViewController- (void)viewDidLoad {    [super viewDidLoad];    data=[[NSMutableArray alloc]init];    table=[[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];    table.delegate=self;    table.dataSource=self;    [self.view addSubview:table];    for (int i=0; i<20; i++) {                NSString*string=[[NSString alloc]initWithFormat:@"数据%d",i];        [data addObject:string];    }}-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return [data count];}-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{        return 60;}-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *str=@"str";    UITableViewCell*cell=[tableView dequeueReusableCellWithIdentifier:str];    if (cell==nil) {        cell =[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:str];    }//    cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.frame];    UIImageView *norImage=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];    [norImage setImage:[UIImage imageNamed:@"image"]];    cell.textLabel.text=[data objectAtIndex:indexPath.row];    //点击单元格 变换背景图片    if ([_indexPath isEqual: indexPath]) {                cell.accessoryType = UITableViewCellAccessoryCheckmark;        cell.backgroundColor=[UIColor redColor];        cell.accessoryView=norImage ;       /* 可以自定义图片  按钮 文本        cell.accessoryType=btn;        cell.accessoryType=label;         */    }        else{        cell.accessoryType = UITableViewCellAccessoryNone;        cell.backgroundColor=[UIColor whiteColor];        cell.accessoryView=nil ;    }    return cell;}-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    if ([self.delegate respondsToSelector:@selector(sendInForIdea:)]) {                _indexPath = indexPath;        [self.delegate sendInForIdea:[data objectAtIndex:indexPath.row]];        [table reloadData];        //      cell.imageView.image=[UIImage imageNamed:@"2"];        //延迟操作     延迟跳转时间       [self performSelector:@selector(pressBtn) withObject:nil afterDelay:3];          //点击获取的 cell  cell变色//    UITableViewCell *cell = [table cellForRowAtIndexPath:indexPath];//    cell.backgroundColor=[UIColor cyanColor];    }}-(void)pressBtn{     [self.navigationController popViewControllerAnimated:YES];}

block反向传值：

//  FirstViewController.h#import 
      
        //直接回车,第一个参数是返回值类型，第二个为重定义的block名称，第三个为要传参数类型和参数名；然后需要定义重定义block类型的属性，并且实现参数为该重定义类型block的方法。//typedef <#existing#> <#new#>;//回调不加断点不容易找出错误typedef void (^BlockColor)(UIColor *color);typedef void (^BlockTitle)(NSString *title);@interface FirstViewController : UIViewController
       
        //block设置为属性，修饰符用copy，即使使用strong，编译器也会将strong处理成copy@property(nonatomic,copy)BlockColor color;@property(nonatomic,copy)BlockTitle Title;@endblock方法
       
      

block方法

//  FirstViewController.m#import "FirstViewController.h"#import "TableViewCell.h"//block 反向传值 @interface FirstViewController (){    UITableView *table;    NSMutableArray *data;    NSMutableArray *arr;}@end@implementation FirstViewController- (void)viewDidLoad {    [super viewDidLoad];    arr =[[NSMutableArray alloc]init];    for (int i=0; i<20; i++) {        NSString * str=[[NSString alloc]initWithFormat:@"数据%d",i];        [arr addObject:str];    }        table=[[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];    table.dataSource=self;    table.delegate=self;    [self.view addSubview:table];    }-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return [arr count];}-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{    TableViewCell *customCell = (TableViewCell *)cell;    [UIView animateWithDuration:2 animations:^{        customCell.image.alpha = 1.0f;    }];}-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    TableViewCell *cell=[[[NSBundle mainBundle]loadNibNamed:@"TableViewCell" owner:self options:nil] lastObject];    cell.Title.text=[arr objectAtIndex:indexPath.row];        //xib 中button不要设置点击事件   这样可以在cell里面调取按钮（点击单元格的按钮可以跳转）    cell.button.tag=indexPath.row;    [cell.button addTarget:self action:@selector(clickAction:) forControlEvents:UIControlEventTouchUpInside];    cell.image.image =[UIImage imageNamed:@"2"];    cell.image.alpha =0.2f;    return cell;    }- (void)clickAction:(UIButton *)sender{    NSInteger tag=sender.tag;    NSLog(@"block 传值");   // __weak typeof(self) weakSelf=self;    if (_Title) {        _Title([arr objectAtIndex:tag]);    }    if (_color) {        _color([UIColor redColor]);    }    [self.navigationController popToRootViewControllerAnimated:YES];}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    NSLog(@"hello world");       TableViewCell *cell = [table cellForRowAtIndexPath:indexPath];    NSString *string = arr[indexPath.row];    NSLog(@"string=%@",string);}-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return 70;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

 

调用：

//  RootViewController.h#import 
     
      #import "SendViewController.h"@interface RootViewController : UIViewController
      
     

#import "RootViewController.h"#import "FirstViewController.h"#import "SendViewController.h"@interface RootViewController () {    FirstViewController *first;    SendViewController *send;    UIButton *btn;    UIButton *btn1;}@end@implementation RootViewController- (void)viewDidLoad {    [super viewDidLoad];    self.navigationItem.title=@"test";    first =[[FirstViewController alloc]init];    send=[[SendViewController alloc]init];    send.delegate=self;    [self creatBtn];}-(void)creatBtn{    btn=[UIButton buttonWithType:UIButtonTypeCustom];    [btn setFrame:CGRectMake(50, 100, 100, 100)];    [btn setBackgroundColor:[UIColor cyanColor]];    [btn setTitle:@"block传值" forState:UIControlStateNormal];    [btn addTarget:self action:@selector(pressBtn) forControlEvents:UIControlEventTouchUpInside];        btn1=[UIButton buttonWithType:UIButtonTypeCustom];    [btn1 setFrame:CGRectMake(200, 100, 100, 100)];    [btn1 setBackgroundColor:[UIColor cyanColor]];    [btn1 setTitle:@"代理传值" forState:UIControlStateNormal];    [btn1 addTarget:self action:@selector(pressBtn1) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];    [self.view addSubview:btn1];  }-(void)pressBtn{    //int a = 0;   block 里面不能改变a的值（报错，block下面打印原来的值），但是可以将a的值赋给别人    //弱引用属性    //弱引用 self    __block __weak typeof(self) weakSelf = self;    __block __weak UIButton *_button = btn;    first.color=^(UIColor *color){    _button.backgroundColor=color;        };        first.Title=^(NSString *title){    weakSelf.navigationItem.title=@"block传值";    //强引用   // [btn setTitle:title forState:UIControlStateNormal];    //弱引用    [_button setTitle:title forState:UIControlStateNormal];    };    [self.navigationController pushViewController:first animated:YES];}-(void)pressBtn1{    [self.navigationController pushViewController:send animated:YES];}-(void)sendInForIdea:(NSString *)text{    [btn1 setTitle:text forState:UIControlStateNormal];    self.navigationItem.title=@"代理传值";}