Xcode_7 iOS_9 模态视图 Objective-C (15)

1、新建SingleViewApplication项目，在storyboard面板把原有的控件删除，拖动一个NavigationController控件，然后删掉右边的root view controller，然后再添加一个ViewController控件，吧NavigationController与之连结，同样是用segue去连结（有点重复，主要是ViewController控件有上下边栏，并且原有的root view controller的导航栏不能删除），类似再做一遍，一个是登录一个是注册，添加响应的控件，两个导航栏之间用present modally来连接（从注册按钮拖动到注册导航视图上）注册页面的两个按钮Cancel和Save都是设置为系统默认按钮：

2、两个导航视图我们需要两个类，现在已经有一个ViewController了，现在我们在添加一个cocoa touch class，名字叫RegisterViewController，并且把两个视图控制器页面分别配置为这两个类：

3、ViewController的代码如下，其中有些需要自己定义输出口和事件：

////  ViewController.h//  TestProject////  Created by 侯家奇 on 16/8/17.//  Copyright © 2016年 侯家奇. All rights reserved.//#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end

////  ViewController.m//  TestProject////  Created by 侯家奇 on 16/8/17.//  Copyright © 2016年 侯家奇. All rights reserved.//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(registerCompletion:) name:@"RegisterCompletionNotification" object:nil];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.    [[NSNotificationCenter defaultCenter] removeObserver:self];}- (void)registerCompletion:(NSNotification *)notification {    NSDictionary *theData = [notification userInfo];    NSString *username = [theData objectForKey:@"username"];    NSLog(@"username = %@", username);}@end

4、RegisterViewController的代码如下，都是采用通知机制将参数传给登录视图的：

////  RegisterViewController.h//  TestProject////  Created by 侯家奇 on 16/8/29.//  Copyright © 2016年 侯家奇. All rights reserved.//#import <UIKit/UIKit.h>@interface RegisterViewController : UIViewController@property (weak, nonatomic) IBOutlet UITextField *txtUsername;- (IBAction)cancel:(id)sender;- (IBAction)save:(id)sender;@end

////  RegisterViewController.m//  TestProject////  Created by 侯家奇 on 16/8/29.//  Copyright © 2016年 侯家奇. All rights reserved.//#import "RegisterViewController.h"@interface RegisterViewController ()@end@implementation RegisterViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.}- (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.}*/- (IBAction)cancel:(id)sender {    [self dismissViewControllerAnimated:YES completion:^{NSLog(@"点击Cancel按钮，关闭模态视图");}];}- (IBAction)save:(id)sender {    [self dismissViewControllerAnimated:YES completion:^{        NSLog(@"点击Save按钮，关闭模态视图");        NSDictionary *dataDict = [NSDictionary dictionaryWithObject:self.txtUsername.text forKey:@"username"];        [[NSNotificationCenter defaultCenter]            postNotificationName:@"RegisterCompletionNotification"         object:nil         userInfo:dataDict];    }];}@end