代理传值

#import "ViewController.h"
#import "SecViewController.h"
[@interface](https://my.oschina.net/u/996807) ViewController ()<YingDelegate>
[@property](https://my.oschina.net/property) (nonatomic , strong) NSString *YingNumber;
[@end](https://my.oschina.net/u/567204)

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIButton *pushB = [[UIButton alloc]init];
[pushB addTarget:self action:@selector(pushView) forControlEvents:UIControlEventTouchUpInside];
[pushB setTitle:@"PushB" forState:UIControlStateNormal];
pushB.frame = CGRectMake(200, 200, 100, 100);
pushB.backgroundColor = [UIColor orangeColor];
[self.view addSubview:pushB];

}

-(void)pushView{

SecViewController *BView = [[SecViewController alloc]init];
[BView setDelegate:self];
[self presentViewController:BView animated:YES completion:^{
}];
}

-(BOOL)loveHer:(BOOL)yesOrno{

return yesOrno;
}

-(NSString *)getToKnowHer:(NSString *)phoneNum{
return  self.YingNumber =  phoneNum;
}

#import <UIKit/UIKit.h>
@protocol YingDelegate<NSObject>

-(NSString *)getToKnowHer:(NSString *)phoneNum;

-(BOOL) loveHer :(BOOL) yesOrno;

@end

@interface SecViewController : UIViewController

@property (assign , nonatomic) id<YingDelegate> delegate;

@end

@interface SecViewController ()

@end

@implementation SecViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *pushA = [[UIButton alloc]init];
[pushA addTarget:self action:@selector(DismissView) forControlEvents:UIControlEventTouchUpInside];
[pushA setTitle:@"BackA" forState:UIControlStateNormal];
pushA.frame = CGRectMake(200, 200, 100, 100);
pushA.backgroundColor = [UIColor orangeColor];
[self.view addSubview:pushA];

}
-(void)DismissView{
if ([_delegate respondsToSelector:@selector(loveHer:)]){
[_delegate loveHer:YES];
}
if ([_delegate respondsToSelector:@selector(getToKnowHer:)]){
[_delegate getToKnowHer:@"189227272"];
}
[self dismissViewControllerAnimated:YES completion:^{

}];
}