1、在您需要傳值出去的控制器標頭檔案裡宣告：

@property (nonatomic,copy) void(^stringblockr)(int age);

self.stringblockr(15);

SecondViewController *send = [[SecondViewControlleralloc]init];

    send.stringblockr = ^(int age) {

NSLog(@"%d",age);

    };

以下是整個流程：

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@property (nonatomic,copy) void(^stringblockr)(int age);

@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {

    [superviewDidLoad];

self.view.backgroundColor = [UIColorpurpleColor];

UIButton *ba = [[UIButtonalloc]initWithFrame:CGRectMake(0, 0, 100,50)];

    ba.backgroundColor = [UIColorblueColor];

    [ba addTarget:selfaction:@selector(popAction) forControlEvents:UIControlEventTouchUpInside];

    [self

}

- (void)popAction {

self.stringblockr(15);

    [self.navigationControllerpopViewControllerAnimated:YES];

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

}

#import "ViewController.h"

#import "SecondViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

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

self.view.backgroundColor = [UIColorredColor];

}

- (IBAction)btnClick:(id)sender {

UILabel *label = [[UILabelalloc]initWithFrame:CGRectMake(30, 100, 100, 30)];

    [self.viewaddSubview:label];

    label.backgroundColor = [UIColororangeColor];

SecondViewController *send = [[SecondViewControlleralloc]init];

    send.stringblockr = ^(int age) {

NSLog(@"%d",age);

    };

    [self.navigationControllerpushViewController:send animated:YES];

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}