ios block传值 最简单的方法

1、在您需要传值出去的控制器头文件里声明：

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

2、然后在你pop或者push到被传值的页面的方法里，调用该方法：

self.stringblockr(15);

3、在被传值的控制器中吊用你传值页面刚申明的方法：

 SecondViewController *send = [[SecondViewController alloc]init];

    

    send.stringblockr = ^(int age) {

        NSLog(@"%d",age);

    };

以下是整个流程：

#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 {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor purpleColor];

    

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

    ba.backgroundColor = [UIColor blueColor];

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

    [self.view addSubview:ba];

}

- (void)popAction {

    self.stringblockr(15);

    [self.navigationController popViewControllerAnimated:YES];

    

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

#import "ViewController.h"

#import "SecondViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

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

    

    self.view.backgroundColor = [UIColor redColor];

    

    

}

- (IBAction)btnClick:(id)sender {

    

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

    [self.view addSubview:label];

    

    label.backgroundColor = [UIColor orangeColor];

    

    SecondViewController *send = [[SecondViewController alloc]init];

    

    send.stringblockr = ^(int age) {

        NSLog(@"%d",age);

    };

    

    [self.navigationController pushViewController:send animated:YES];

    

    

    

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}