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第二个SecondController:这个我把.h跟.m文件都贴出来:
// // 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
这样就实现了!大神勿喷。
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