iOS 视图之间传值（一）代理传值

实现从secondViewController中的视图向viewController中的视图传值

首先：创建协议PassValueDelegate.h

////  AppDelegate.h//  PassValueByDelegate////  Created by 唐韧 on 12-8-28.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>@class ViewController;@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) ViewController *viewController;@end

在secondViewController创建代理

#import <UIKit/UIKit.h>#import "PassValueDelegate.h"@interface SecondViewController : UIViewController@property (retain, nonatomic) IBOutlet UITextField *nameTextField;@property (retain, nonatomic) IBOutlet UITextField *ageTextFiled;@property (retain, nonatomic) IBOutlet UITextField *gendarTextField;//这里用assign而不用retain是为了防止引起循环引用。@property(nonatomic,assign) NSObject<PassValueDelegate> *delegate;- (IBAction)okBtnClicked:(id)sender;- (IBAction)closeKeyboard:(id)sender;@end@implementation SecondViewController@synthesize nameTextField;@synthesize ageTextFiled;@synthesize gendarTextField;@synthesize delegate;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.    self.navigationItem.title = @"Second";    }- (void)viewDidUnload{    [self setNameTextField:nil];    [self setAgeTextFiled:nil];    [self setGendarTextField:nil];    [super viewDidUnload];    // Release any retained subviews of the main view.    // e.g. self.myOutlet = nil;}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation == UIInterfaceOrientationPortrait);}- (void)dealloc {    [nameTextField release];    [ageTextFiled release];    [gendarTextField release];    [super dealloc];}- (IBAction)okBtnClicked:(id)sender {    UserEntity *userEntity = [[UserEntity alloc] init];    userEntity.userName = self.nameTextField.text;    userEntity.gendar = self.gendarTextField.text;    userEntity.age = [self.ageTextFiled.text intValue];        //通过委托协议传值    [self.delegate passValue:userEntity];    //退回到第一个窗口    [self.navigationController popViewControllerAnimated:YES];        [userEntity release];}/*单击屏幕其他区域关闭键盘的方法 实现方法是：首先选中xib文件的view，设置class为UIControl 然后在事件中选择Touch Down拖线到.h文件中声明该方法，最后实现下面即可 */- (IBAction)closeKeyboard:(id)sender {    [self.nameTextField resignFirstResponder];    [self.ageTextFiled resignFirstResponder];    [self.gendarTextField resignFirstResponder];}@end

在viewController实现代理,实现值传递

#import <UIKit/UIKit.h>#import "PassValueDelegate.h"//第一个窗口遵守PassValueDelegate@interface ViewController : UIViewController<PassValueDelegate>@property (retain, nonatomic) IBOutlet UILabel *nameLabel;@property (retain, nonatomic) IBOutlet UILabel *ageLabel;@property (retain, nonatomic) IBOutlet UILabel *gendarLabel;- (IBAction)openBtnClicked:(id)sender;@end@implementation ViewController@synthesize nameLabel;@synthesize ageLabel;@synthesize gendarLabel;//实现协议，在第一个窗口显示在第二个窗口输入的值，类似Android中的onActivityResult方法-(void)passValue:(UserEntity *)value{    self.nameLabel.text = value.userName;    self.ageLabel.text = [NSString stringWithFormat:@"%d",value.age];    self.gendarLabel.text = value.gendar;}- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.    self.navigationItem.title = @"First";    }- (void)viewDidUnload{    [self setNameLabel:nil];    [self setAgeLabel:nil];    [self setGendarLabel:nil];    [super viewDidUnload];    // Release any retained subviews of the main view.}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);}- (void)dealloc {    [nameLabel release];    [ageLabel release];    [gendarLabel release];    [super dealloc];}//点击进入第二个窗口的方法- (IBAction)openBtnClicked:(id)sender {    SecondViewController *secondView = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:[NSBundle mainBundle]];    //设置第二个窗口中的delegate为第一个窗口的self    secondView.delegate = self;        [self.navigationController pushViewController:secondView animated:YES];    [secondView release];}@end

完整代码下载：代理传值完整代码