IOS学习之UiViewController带值跳转以及协议的实现(四)

我们都知道Android里面的每个页面都是一个Activity，而Intent又是连接Activity的纽带，在IOS里面，每个页面都是一个UiViewController,而IOS中的跳转直装直接通过navigationController pushViewController:就可以了，还可以直接给跳转的页面赋值，而android里面是通过Intent把值传到第二页面，在IOS直接可以用UiviewController点出来，从后往前传值而是通过协议来实现，也就是android里面的所谓的接口。下面看看效果图：

我们新建了两个UiViewController，第一个传第二个直接赋值就可以了，第二个传第一个我们使的是协议。代码如下：

第一个FirstController:

//
//  FirstController.m
//  MyController
//
//  Created by xiaoyuan on 15/4/25.
//  Copyright (c) 2015年 xiaoyuan. All rights reserved.
//

#import "FirstController.h"
#import "SecondController.h"

@interface FirstController ()<changeVCDelegate>

@end

@implementation FirstController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationController.navigationBar.barTintColor =[UIColor redColor];
    [self.navigationController.navigationBar setTranslucent:NO];
    
    UIButton*btn =[UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(0, 100, 50, 50);
    btn.backgroundColor =[UIColor grayColor];
    CGPoint center = btn.center;
    center.x = self.view.center.x;
    btn.center = center;
    [btn setTitle:@"点我" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(goon) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    
    
    
    // Do any additional setup after loading the view.
}

-(void) goon{
    SecondController*two =[[SecondController alloc]init];
    two.a = 1;//直接赋值
    two.delegate = self;
    [self.navigationController pushViewController:two animated:YES];//跳转
}
//协议方法第二个页面返回通过协议执行此方法
-(void)passValue:(NSString *)str sencode:(NSString *)secondStr
{
    UIAlertView *alreat  = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%@",str] message:[NSString stringWithFormat:@"%@",secondStr] delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
    
    [alreat show];
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

//
//  SecondController.h
//  MyController
//
//  Created by xiaoyuan on 15/4/25.
//  Copyright (c) 2015年 xiaoyuan. All rights reserved.
//

#import <UIKit/UIKit.h>
//协议
@protocol changeVCDelegate <NSObject>

-(void)passValue:(NSString *) str sencode:(NSString *)secondStr;

@end

@interface SecondController : UIViewController
@property (nonatomic ,assign)int a;
//声明代理
@property (nonatomic ,weak) id<changeVCDelegate> delegate;
@end

//
//  SecondController.m
//  MyController
//
//  Created by xiaoyuan on 15/4/25.
//  Copyright (c) 2015年 xiaoyuan. All rights reserved.
//

#import "SecondController.h"

@interface SecondController ()

@end

@implementation SecondController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    // Do any additional setup after loading the view.
    UILabel*text =[[UILabel alloc]initWithFrame:CGRectMake(0, 100, 400, 100)]
    ;
    text.backgroundColor =[UIColor grayColor];
    [text setText:[NSString stringWithFormat:@"我是一个页面传过来的%d",self.a]];
    text.textAlignment =NSTextAlignmentCenter;
    [self.view addSubview:text];
    //返回键
    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:self action:@selector(backAction)];
    self.navigationItem.leftBarButtonItem = rightButton;
    
}

//返回 通过协议把
-(void)backAction
{
    [self.delegate passValue:@"我是第二个页面传的值" sencode:@"我也是第二页面传回来的"];
    [self.navigationController popViewControllerAnimated:YES];
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

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