#import <UIKit/UIKit.h>#import "SencondViewController.h"@interface FirstViewController : UIViewController<ResultDelegate>@property (strong, nonatomic) IBOutlet UIButton *delegateBtn;@property (strong, nonatomic) IBOutlet UITextField *result_name;@property (strong, nonatomic) IBOutlet UITextField *result_pass;@property SencondViewController *second;- (IBAction)delegateAction:(id)sender;- (IBAction)observeAction:(id)sender;@end

#import "FirstViewController.h"#import "SencondViewController.h"@interface FirstViewController ()@end@implementation FirstViewController@synthesize result_name;@synthesize result_pass;- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.}- (IBAction)delegateAction:(id)sender {    self.second = [[SencondViewController alloc]init];    self.second.deleage = self;    [self.navigationController pushViewController:self.second animated:true];}-(void)result:(NSString *)name pre:(NSString *)pass{    result_name.text = name;    result_pass.text = pass;}@end

#import <UIKit/UIKit.h>@protocol ResultDelegate@required-(void)result:(NSString *)name pre:(NSString *)pass;@end@interface SencondViewController : UIViewController@property (strong, nonatomic) IBOutlet UITextField *_name;@property (strong, nonatomic) IBOutlet UITextField *_password;- (IBAction)save:(id)sender;@property (retain, nonatomic) id<ResultDelegate> deleage;@end

#import "SencondViewController.h"@interface SencondViewController ()@end@implementation SencondViewController@synthesize _name;@synthesize _password;- (void)viewDidLoad {    [super viewDidLoad];}- (IBAction)save:(id)sender {        NSString *txtName = [self._name text];        NSString *txtPass = [self._password text];        [self.deleage result:txtName pre:txtPass];        [self.navigationController popViewControllerAnimated:true];}@end