iOS block进行页面之间传值

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITextField *contentTxtField;

@end

#import "SecondViewController.h"

#import "FirstViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (void)viewDidLoad

{

[super viewDidLoad];

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

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (IBAction)jumpToSecondBtnClick:(UIButton *)sender

{

UIStoryboard *firstSb=[UIStoryboard storyboardWithName:@"Main" bundle:nil];

SecondViewController *secondCtl=[firstSb instantiateViewControllerWithIdentifier:@"second"];

[secondCtl compeleteBlock:^(NSString *string) {

_contentTxtField.text=string;

}];

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

}

@end

#import <UIKit/UIKit.h>

typedef void (^BlockPassValue) (NSString *string);

@interface SecondViewController : UIViewController

{

BlockPassValue myBlockValue;

}

@property (weak, nonatomic) IBOutlet UITextField *valueTxtField;

-(void)compeleteBlock:(BlockPassValue)myblock;

@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view.

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

-(void)compeleteBlock:(BlockPassValue)myblock

{

myBlockValue=myblock;

}

- (IBAction)backToFirstBtnClick:(UIButton *)sender

{

if (myBlockValue)

{

myBlockValue(_valueTxtField.text);

}

[self.navigationController popViewControllerAnimated:YES];

}

@end