delegate页面传值

B页面往A页面传值

B页面.h 文件#import <UIKit/UIKit.h>@protocol TwoViewDelegate <NSObject>- (void)changeValue:(NSString *)value;@end@interface SecondVCViewController : UIViewController@property NSString *text;@property (nonatomic) id<TwoViewDelegate> delegate;@endB页面.m 文件返回方法：- (void)btnPressed:id{    [self.delegate changeValue:textFiled.text];    [self dismissViewControllerAnimated:YES completion:nil];}

A页面的实现 B页面的中声明的代理

#import "ViewController.h"#import "SecondVCViewController.h"@interface ViewController ()<TwoViewDelegate>@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, 100, 100, 100)];    label.text = @"我是谁";    [self.view addSubview:label];    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];    btn.frame = CGRectMake(30, 200, 100, 100);    btn.titleLabel.text = @"跳转";    btn.backgroundColor = [UIColor blueColor];    [btn addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];    // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (void)btnPressed:id{    SecondVCViewController *vc = [[SecondVCViewController alloc]init];    vc.text = @"只是传递过来的值";    vc.delegate = self;//    [self.navigationController pushViewController:vc animated:YES];    [ self presentViewController:vc animated: YES completion:nil];}- (void)changeValue:(NSString *)value{    NSLog(@"返回值为：%@",value);}@end

demo地址：http://download.csdn.net/detail/luyu2012001/9418408