iOS 代理传值

//
//  NextViewController.h
//  代理---C
//
//  Created by phyone on 15/7/30.
//  Copyright (c) 2015年 phyone. All rights reserved.
//

#import <UIKit/UIKit.h>
//1.声明代理方法

@protocol NextDelegate <NSObject>//
- (void)toLoginWithName:(NSString *)name;//
@end//

@interface NextViewController : UIViewController

//2.声明代理的属性
@property (nonatomic,assign)id<NextDelegate>delegate;//
@property(nonatomic,copy)NSString *titleName;//

@end

//
//  NextViewController.m
//  代理---C
//
//  Created by phyone on 15/7/30.
//  Copyright (c) 2015年 phyone. All rights reserved.
//

#import "NextViewController.h"

@interface NextViewController ()

@end

@implementation NextViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor grayColor];
self.title = _titleName;
UIButton *regist = [UIButton buttonWithType:UIButtonTypeCustom];
regist.frame = CGRectMake(200, 200, 100, 50);
regist.backgroundColor = [UIColor purpleColor];
[regist addTarget:self action:@selector(toRegister) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:regist];
}

//3.什么时候触发这个代理方法
- (void)toRegister
{
[self.navigationController popViewControllerAnimated:YES];
//    点击注册成功后触发这个代理

//  4.通过协议的属性 调用代理方法
[self.delegate toLoginWithName:@"登录"];
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

//
//  ViewController.m
//  代理---C
//
//  Created by phyone on 15/7/30.
//  Copyright (c) 2015年 phyone. All rights reserved.
//

#import "ViewController.h"
//5.导入代理
#import "NextViewController.h"
@interface ViewController ()<NextDelegate>
{
UIButton *button;
}
@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.title = @"登录";
self.view.backgroundColor = [UIColor grayColor];
button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(100, 100, 200, 50);
button.backgroundColor = [UIColor redColor];
[button addTarget:self action:@selector(nextVC) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}

- (void)nextVC
{
NextViewController *vc = [[NextViewController alloc]init];
//      6.在初始化有代理方法的对象地方 挂上代理
vc.delegate = self;
vc.titleName = @"注册";
[self.navigationController pushViewController:vc animated:YES];
}

//      7.写上代理方法 等待被执行
- (void)toLoginWithName:(NSString *)name
{
[button setTitle:name forState:UIControlStateNormal];
NSLog(@"%@ ok",name);
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end