还是跟上一篇委托传值demo一样的，大家可以对比一下；block传值也是一定要在跳转的方法里调用。代码如下：

ViewController.h

1 #import 
     
      2 3 @interface ViewController : UIViewController4 5 6 @end
     

 

ViewController.m

1 #import "ViewController.h" 2 #import "MoneyPickerView.h" 3 @interface ViewController ()
     
       4 { 5     UITableView *_tableView; 6 } 7 @property (nonatomic,strong)NSString *cellString; 8 @property (nonatomic,strong)MoneyPickerView *pickerView; 9 @end10 11 @implementation ViewController12 13 - (void)viewDidLoad {14     [super viewDidLoad];15     self.view.backgroundColor = [UIColor whiteColor];16     _tableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];17     _tableView.delegate = self;18     _tableView.dataSource = self;19     _tableView.tableFooterView = [[UIView alloc]init];20     [self.view addSubview:_tableView];21 }22 23 24 #pragma mark uitableview协议方法25 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{26     return 3;27 }28 29 30 31 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{32     static NSString *identify = @"Cell";33     UITableViewCell *cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identify];//如果重用，把数据加载到重写的cell里，不然刷新会重复加载。34     if (indexPath.row == 0) {35         cell.textLabel.text = @"点击加载数据";36     }37     if (indexPath.row == 1) {38         cell.textLabel.text = @"数据如下";39     }40     if (indexPath.row == 2) {41         cell.textLabel.text = _cellString;42     }43     return cell;44 }45 46 47 48 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath49 {50     [tableView deselectRowAtIndexPath:indexPath animated:YES];51     if (indexPath.row == 0) {52         _pickerView = [[MoneyPickerView alloc]initWithFrame:CGRectMake(0, 300, CGRectGetWidth(self.view.bounds), CGRectGetMaxY(self.view.bounds) - 300)];53         //BLOck回调 并刷新界面54         [_pickerView sendMoneyWithBlock:^(NSString *moneyString) {55             _cellString = moneyString;56             [_tableView reloadData];57         }];58         [self.view addSubview:_pickerView];//加载试图59     }60 }61 62 63 @end
     

 

MoneyPickerView.h

1 #import 
     
      2 typedef void (^MyBlock)(NSString *moneyString);//block 3 @interface MoneyPickerView : UIView 4 @property (nonatomic,readwrite)  NSInteger currentValue;5 @property (nonatomic,copy) MyBlock  returnBlock;6 - (void)sendMoneyWithBlock:(MyBlock)block;7 @end
     

 

MoneyPickerView.m

1 #import "MoneyPickerView.h"  2 @interface MoneyPickerView ()
     
        3 @property (nonatomic, copy) void (^backValue)(NSString *strValue);  4 @property (nonatomic,strong) UIPickerView *pickerView;  5 @property (nonatomic,strong)  NSMutableArray *objectArray;  6 @end  7 @implementation MoneyPickerView  8   9 - (instancetype)initWithFrame:(CGRect)frame{ 10     self = [super initWithFrame:frame]; 11     if (self) { 12         self.backgroundColor = [UIColor whiteColor]; 13         [self addDayPickerView]; 14         [self loadPickerDataSource]; 15         [self loadSelfView]; 16         [_pickerView selectRow:_currentValue inComponent:0 animated:NO]; 17     } 18     return self; 19 } 20  21 #pragma mark 加载界面 22 //加载button 23 -(void)loadSelfView{ 24     UIButton *canselButton = [[UIButton alloc]initWithFrame:CGRectMake(20, 10, 40, 70)]; 25     canselButton.backgroundColor = [UIColor clearColor]; 26     [canselButton setTitle:@"取消" forState:UIControlStateNormal]; 27     [canselButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal]; 28     [canselButton addTarget:self action:@selector(cancelButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 29     [self addSubview:canselButton]; 30      31     UIButton *surelButton = [[UIButton alloc]initWithFrame:CGRectMake(CGRectGetMaxX(self.bounds) - 20 - 35, 10, 40, 70)]; 32     surelButton.backgroundColor = [UIColor clearColor]; 33     [surelButton setTitle:@"确定" forState:UIControlStateNormal]; 34     [surelButton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; 35     [surelButton addTarget:self action:@selector(sureButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 36     [self addSubview:surelButton]; 37 } 38  39 /** 40  *  加载数据源 41  */ 42 - (void)loadPickerDataSource{ 43     _objectArray = [[NSMutableArray alloc]init]; 44     for (NSInteger idx = 0; idx<=60 ;idx++) { 45         NSString *value = [NSString stringWithFormat:@"支付宝%ld元",(long)idx]; 46         [_objectArray addObject:value]; 47     } 48 } 49  50 /** 51  *  初始化pickerview 52  */ 53 - (void)addDayPickerView{ 54     _pickerView = [[UIPickerView alloc]init]; 55     _currentValue = 0; 56     _pickerView.delegate = self; 57     [self addSubview:_pickerView]; 58 } 59  60 - (void)sendMoneyWithBlock:(MyBlock)block{ 61     self.returnBlock = block; 62 //    self.returnBlock(@"d"); 63 } 64  65 #pragma mark 自定义方法 66 /** 67  *  确定按钮 68  * 69  *  @param sender button事件 70  */ 71 - (void)sureButtonPressed:(UIButton *)sender{ 72     if (self.returnBlock) { 73     self.returnBlock(_objectArray[_currentValue]); 74     } 75     [self removeFromSuperview]; 76 } 77  78  79  80 /** 81  *  取消按钮 82  * 83  *  @param sender 84  */ 85 - (void)cancelButtonPressed:(UIButton *)sender{ 86     [self removeFromSuperview]; 87 } 88  89 #pragma mark pickerView协议方法 90 //返回的列数 91 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ 92     return 1; 93 } 94 //选择的行数 95 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 96     _currentValue = row; 97 } 98  99 // returns the # of rows in each component..100 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{101     return _objectArray.count;102 }103 104 //没列的数据105 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component106 {107     return [_objectArray objectAtIndex:row];108 }109 110 111 @end
     

 

 

------------>下面是一个更简单的demo代码

ViewController.h

1 #import 
     
      2 3 @interface ViewController : UIViewController4 5 6 @end
     

ViewController.m

1 #import "ViewController.h" 2 #import "SecondViewController.h" 3 @interface ViewController () 4 @property(nonatomic,strong)UIButton  *buttonToTwo; 5 @property(nonatomic,strong)UILabel   *textLabel; 6 @end 7  8 @implementation ViewController 9 10 - (void)viewDidLoad {11     [super viewDidLoad];12     self.view.backgroundColor = [UIColor whiteColor];13     14     _buttonToTwo = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 100, 40)];15     [_buttonToTwo setTitle:@"跳转" forState:UIControlStateNormal];16     [_buttonToTwo setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];17     [_buttonToTwo addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];18     [self.view addSubview:_buttonToTwo];19     20     _textLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 40)];21     _textLabel.textColor = [UIColor redColor];22     _textLabel.backgroundColor = [UIColor grayColor];23     [self.view addSubview:_textLabel];24 }25 26 27 //跳转方法28 -(void)buttonPressed:(UIButton *)sender{29     SecondViewController *second = [[SecondViewController alloc]init];30     [second sendString:^(NSString *sendString) {31         _textLabel.text = sendString;32     }];33     [self presentViewController:second animated:YES completion:nil];34 }35 36 @end

 

 

SecondViewController.h

1 #import 
     
      2 3 @interface SecondViewController : UIViewController4 5 typedef void (^MyBlock)(NSString *sendString);6 @property (nonatomic,copy)MyBlock backBlock;7 -(void)sendString:(MyBlock)block;8 @end
     

SecondViewController.m

1 #import "SecondViewController.h" 2  3 @interface SecondViewController () 4 @property(nonatomic,strong)UIButton     *buttonToOne; 5 @property(nonatomic,strong)UITextField  *textField; 6  7 @end 8  9 @implementation SecondViewController10 11 - (void)viewDidLoad {12     [super viewDidLoad];13     self.view.backgroundColor = [UIColor purpleColor];14     _buttonToOne = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 100, 40)];15     [_buttonToOne setTitle:@"跳转" forState:UIControlStateNormal];16     [_buttonToOne setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];17     [_buttonToOne addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];18     [self.view addSubview:_buttonToOne];19 20     _textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 200, 40)];21     _textField.layer.borderWidth = 1.0;22     _textField.layer.borderColor = [UIColor grayColor].CGColor;23     _textField.textAlignment = NSTextAlignmentLeft;24     _textField.textColor  = [UIColor redColor];25     [self.view addSubview:_textField];26 }27 28 - (void)sendString:(MyBlock)block{29     self.backBlock = block;30 }31 32 //跳转方法33 -(void)buttonPressed:(UIButton *)sender{34     if (self.backBlock) {35         self.backBlock(_textField.text);36     }37     [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];38 }39 40 @end