import "AppDelegate.h"
import "FirstViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
-
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];FirstViewController *firstVC = [[FirstViewController alloc]init];
UINavigationController *navC = [[UINavigationController alloc]initWithRootViewController:firstVC];
[self.window setRootViewController:navC];
return YES;
}
import "FirstViewController.h"
import "SecondViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
-
(void)viewDidLoad {
[super viewDidLoad];
// 设置标题
self.navigationItem.title = @"FirstVC";
// 设置导航条右侧按钮
UIBarButtonItem *rightBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"下一步" style:UIBarButtonItemStyleDone target:self action:@selector(rightBarButtonAction:)];
self.navigationItem.rightBarButtonItem = rightBtnItem;// 设置导航左侧按钮（点击后回收键盘）
UIBarButtonItem *leftBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"回收键盘" style:UIBarButtonItemStyleDone target:self action:@selector(endEditingAction)];
leftBtnItem.tag = 2000;
self.navigationItem.leftBarButtonItem = leftBtnItem;// 初始化一个textField文本输入框
UITextField *userTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 200, 40)];
userTextField.borderStyle = UITextBorderStyleBezel;
userTextField.textAlignment = NSTextAlignmentCenter;
userTextField.placeholder = @"请输入文字";
userTextField.tag = 1000;
[self.view addSubview:userTextField];UITextField *pwsTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 180, 200, 40)];
pwsTextField.borderStyle = UITextBorderStyleBezel;
pwsTextField.textAlignment = NSTextAlignmentCenter;
pwsTextField.placeholder = @"密 码";
pwsTextField.keyboardType = UIKeyboardTypeNumberPad;
pwsTextField.secureTextEntry = YES;
pwsTextField.tag = 1001;
[self.view addSubview:pwsTextField];UITextField *yanZhengTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 260, 200, 40)];yanZhengTextField.borderStyle = UITextBorderStyleBezel;
yanZhengTextField.textAlignment = NSTextAlignmentCenter;
yanZhengTextField.keyboardType = UIKeyboardTypeNumberPad;
pwsTextField.keyboardType = UIKeyboardTypeNumberPad;
yanZhengTextField.placeholder = @"请输入验证码";
yanZhengTextField.tag = 1002;
[self.view addSubview:yanZhengTextField];}
// 导航条右侧按钮回调方法，具体实现为推送到下个界面
-(void)rightBarButtonAction:(UIBarButtonItem*)sender{
SecondViewController *secondVC = [[SecondViewController alloc]init];
// 将文本输入框的值赋值secondVC的属性
UITextField userTextField = (UITextField)[self.view viewWithTag:1000];// textField为局部变量
secondVC.userStr = userTextField.text;
UITextField pwsTextField = (UITextField)[self.view viewWithTag:1001];
secondVC.pwsStr = pwsTextField.text;
UITextField yanZhengTextField = (UITextField)[self.view viewWithTag:1002];
secondVC.yanZhengStr = yanZhengTextField.text;[self.navigationController pushViewController:secondVC animated:YES];
}
// 导航条左侧按钮回调方法
-(void)endEditingAction{
[self.view endEditing:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
import <UIKit/UIKit.h>
@interface SecondViewController : UIViewController
@property (nonatomic ,retain)NSString *userStr; // 用来接受第一个界面传过来的内容
@property (nonatomic ,retain)NSString *pwsStr;
@property (nonatomic ,retain)NSString *yanZhengStr;
@end
import "SecondViewController.h"
import "ThirdViewController.h"
@interface SecondViewController ()<ThirdViewControllerDelegate>
@end
@implementation SecondViewController
// thirdVC的代理方法，作用为，将thirdVC上的值传递到当前的视图控制器
-(void)passValueWithDic:(NSDictionary *)valueDic{
NSLog(@"dic_______%@",valueDic);
UILabel userLabel = (UILabel)[self.view viewWithTag:5000];
userLabel.text = [valueDic valueForKey:@"name"];
UILabel *pswLabel = (UILabel*)[self.view viewWithTag:5001];
pswLabel.text = [valueDic valueForKey:@"pws"];
UILabel *yanZhengLabel = [self.view viewWithTag:5002];
yanZhengLabel.text = [valueDic valueForKey:@"yanZheng"];
}
-
(void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = @"SecondVC";
// 声明一个label，用来显示首个界面传过来的内容
UILabel *userLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 200, 40)];
// label显示的内容为从首个界面传过来的值
userLabel.text = self.userStr;
userLabel.tag = 5000;
[self.view addSubview:userLabel];UILabel *pwsLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 180, 200, 40)];
pwsLabel.text = self.pwsStr;
pwsLabel.tag = 5001;
[self.view addSubview:pwsLabel];UILabel *yanZhengLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 260, 200, 40)];
yanZhengLabel.text = self.yanZhengStr;
yanZhengLabel.tag = 5002;
[self.view addSubview:yanZhengLabel];// 设置导航条右侧按钮，点击跳转到下个界面（ThirdViewController）
UIBarButtonItem *rightBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"下一步" style:UIBarButtonItemStyleDone target:self action:@selector(rightBarButtonAction:)];
self.navigationItem.rightBarButtonItem = rightBtnItem;
}
// 导航条右侧按钮回调方法，点击跳转到下个界面（ThirdViewController）
-(void)rightBarButtonAction:(UIBarButtonItem*)sender{
ThirdViewController *thirdVC = [[ThirdViewController alloc]init];
// 指定代理 {self:在类方法（加号方法）中指的是本类，在对象方法（减号方法）中指的是该类的一个对象}
thirdVC.delegate = self;
[self.navigationController pushViewController:thirdVC animated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
import <UIKit/UIKit.h>
@protocol ThirdViewControllerDelegate <NSObject>
// 该方法的参数就是要传递的值
-(void)passValueWithDic:(NSDictionary*)valueDic;
@end
@interface ThirdViewController : UIViewController
@property (nonatomic ,assign)id<ThirdViewControllerDelegate> delegate;
@end
import "ThirdViewController.h"
@interface ThirdViewController ()
@end
@implementation ThirdViewController
-
(void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = @"ThirdVC";for (int i = 0; i < 3; i++) {
UITextField textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100+100i, 200, 40)];
textField.borderStyle = UITextBorderStyleBezel;
textField.textAlignment = NSTextAlignmentCenter;
textField.placeholder = @"请输入文字";
textField.tag = 1000+i;
[self.view addSubview:textField];
}// 因为需要向前传值，所以需要捕获点击按钮的事件，所以需要重新定义leftBarButtonItem
UIBarButtonItem *leftBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:self action:@selector(backBtnAction:)];
leftBtnItem.tag = 2000;
self.navigationItem.leftBarButtonItem = leftBtnItem;
}
// 返回按钮的点击事件
-(void)backBtnAction:(UIBarButtonItem*)sender{
UITextField nameTextField = (UITextField)[self.view viewWithTag:1000];
UITextField pwsTextField = (UITextField)[self.view viewWithTag:1001];
UITextField yanZhengTextField = (UITextField)[self.view viewWithTag:1002];
/*
if条件判断中
第一步：先判断是否指定了代理
第二步：respondsToSelector该方法的返回值为BOOL类型。该方法会从指定的代理类中（这里我们的代理类就是SecondViewController）找寻方法选择器重中方法的实现，如果没有实现该协议方法，就返回NO，如果实现，就返回YES
self.delegate : 指定哪个类为代理，它就是代理类的一个对象，在这里它指的就是 SecondViewController这个类的一个对象那，我们在SecondViewController也实现了passValueWithDic:这个方法，所以我们可以调用此方法
（self.delegate = SecondViewController）
*/
if (self.delegate && [self.delegate respondsToSelector:@selector(passValueWithDic:)]) {
[self.delegate passValueWithDic:@{@"name":nameTextField.text,@"pws":pwsTextField.text,@"yanZheng":yanZhengTextField.text}];
}
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
