iOS开发项目难点亮点 ios开发小项目

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IT剑客风云 2024-07-06 05:42:59

文章标签 iOS开发项目难点亮点 ui 移动开发 #import #pragma 文章分类 iOS 移动开发

iOS开发UI篇—实现一个私人通讯录小应用（二）

一、实现功能说明

（1）点击注销按钮，弹出一个对话框，点击确定后移除当前栈顶的控制器，返回开始界面，点击取消，不做任何操作。

注意：注销按钮的单击事件已经进行了连线。实现-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex需要遵守UIActionSheetDelegate协议。

1 //注销按钮
 2 - (IBAction)logoutBtn:(id)sender {
 3     
 4     UIActionSheet *sheet =[[UIActionSheet alloc]initWithTitle:@"确定要注销?" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"确定" otherButtonTitles: nil];
 5     
 6     [sheet showInView:self.view];
 7 }
 8 
 9 #pragma mark-代理方法
10 -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
11 {
12     if (buttonIndex!=0)return;
13     //移除栈顶的控制器
14     [self.navigationController popViewControllerAnimated:YES];
15 }

（2）当两个文本框的状态发生改变时，通知添加按钮变为可用状态。

知识点：通知（注册监听）

1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4     
 5     //1.获得通知中心
 6     NSNotificationCenter *center=[NSNotificationCenter defaultCenter];
 7     //2.注册监听
 8     [center addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.nameFeild];
 9     [center addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.phoneFeild];
10 }
11 
12 
13 
14 //当文本框内容改变的时候，通知self调用该方法
15 -(void)textChange
16 {
17     //判断，如果两个文本框的内容都改变（有值）的时候，添加按钮变成可交互的
18     self.addBtn.enabled=(self.nameFeild.text.length>0&&self.phoneFeild.text.length>0);
19     NSLog(@"通知调用的事件");
20 }
21 
22 //临终遗言
23 -(void)dealloc
24 {
25     [[NSNotificationCenter defaultCenter] removeObserver:self];
26 }

（3）数据的逆传（使用代理）

TXContatcsViewController.m文件

1 //  Created by 鑫 on 14-10-21.
  2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
  3 //
  4 
  5 #import "TXContactsViewController.h"
  6 #import "TXAddViewController.h"
  7 #import "TXContact.h"
  8 #import "TXEditViewController.h"
  9 #import "TXContactCell.h"
 10 
 11 @interface TXContactsViewController ()<UIActionSheetDelegate,TXAddViewControllerDelegate, TXEditViewControllerDelegate>
 12 - (IBAction)logout:(id)sender;
 13 @property (nonatomic, strong) NSMutableArray *contacts;
 14 @end
 15 
 16 @implementation TXContactsViewController
 17 
 18 - (id)initWithStyle:(UITableViewStyle)style
 19 {
 20     self = [super initWithStyle:style];
 21     if (self) {
 22         // Custom initialization
 23     }
 24     return self;
 25 }
 26 - (NSMutableArray *)contacts
 27 {
 28     if (_contacts == nil) {
 29         _contacts = [NSMutableArray array];
 30     }
 31     return _contacts;
 32 }
 33 
 34 - (void)viewDidLoad
 35 {
 36     [super viewDidLoad];
 37     self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
 38     //    self.tableView.rowHeight = 70;
 39     
 40     }
 41 
 42 - (void)didReceiveMemoryWarning
 43 {
 44     [super didReceiveMemoryWarning];
 45     // Dispose of any resources that can be recreated.
 46 }
 47 
 48 #pragma mark - Table view data source
 49 
 50 
 51 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 52 {
 53 #warning Incomplete method implementation.
 54     // Return the number of rows in the section.
 55     return self.contacts.count;
 56 }
 57 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 58 {
 59     // 1.创建cell
 60     TXContactCell *cell = [TXContactCell cellWithTableView:tableView];
 61     
 62     // 2.设置cell的数据
 63     cell.contact = self.contacts[indexPath.row];
 64     
 65 
 66     
 67     return cell;
 68 }
 69 
 70 /**
 71  *  注销
 72  *
 73  *  @param sender <#sender description#>
 74  */
 75 
 76 - (IBAction)logout:(id)sender {
 77     
 78     //框框从底部跳出来
 79     UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"确定注销" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"确定" otherButtonTitles:nil, nil];
 80     [sheet showInView:self.view];
 81     
 82 }
 83 
 84 #pragma mark --actionSheet的代理方法
 85 -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
 86 {
 87 //    if (buttonIndex ==0) {
 88 //        //出栈
 89 //        [self.navigationController popViewControllerAnimated:YES ];
 90 //    }
 91     if (buttonIndex !=0) return;
 92                 //出栈
 93     [self.navigationController popViewControllerAnimated:YES ];
 94         
 95 
 96 }
 97 /**
 98  *  执行跳转下个控制器之前会调用下面这个方法
 99  */
100 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
101 {
102     id vc = segue.destinationViewController;
103     
104     if ([vc isKindOfClass:[TXAddViewController class]]) { // 如果是跳转到添加联系人的控制器
105         // 设置下一个控制器(添加联系人的控制器)的代理
106         TXAddViewController *addVc = vc;
107         addVc.delegate = self;
108     } else if ([vc isKindOfClass:[TXEditViewController class]]) { // 如果是跳转到查看(编辑)联系人的控制器
109         TXEditViewController *editVc = vc;
110         // 取得选中的那行
111         NSIndexPath *path = [self.tableView indexPathForSelectedRow];
112        //传递数据给editVC
113         
114         editVc.contact = self.contacts[path.row];
115         editVc.delegate = self;
116     }
117 
118 }
119 
120 #pragma mark - TXAddViewController的代理方法
121 - (void)addViewController:(TXAddViewController *)addVc didAddContact:(TXContact *)contact
122 {
123     // 1.添加模型数据
124     [self.contacts addObject:contact];
125     
126     // 2.刷新表格
127     [self.tableView reloadData];
128 }
129 #pragma mark - TXEditViewController的代理方法
130 - (void)editViewController:(TXEditViewController *)editVc didSaveContact:(TXContact *)contact
131 {
132     [self.tableView reloadData];
133 }
134 @end

TXAddViewController.h文件

1 #import <UIKit/UIKit.h>
 2 //包括TXContact这个模型
 3 @class TXAddViewController, TXContact;
 4 
 5 @protocol TXAddViewControllerDelegate <NSObject>
 6 
 7 @optional
 8 //- (void)addViewController:(TXAddViewController *)addVc didAddContactWithName:(NSString *)name phone:(NSString *)phone;你当我代理你就能拿到我那两个属性值，如果参数多，不好用，可用模型，以下使用模型的
 9 - (void)addViewController:(TXAddViewController *)addVc didAddContact:(TXContact *)contact;
10 @end
11 
12 @interface TXAddViewController : UIViewController
13 @property (nonatomic, weak) id<TXAddViewControllerDelegate> delegate;
14 @end

TXAddViewController.m文件

1 //  Created by 鑫 on 14-10-21.
 2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
 3 //
 4 
 5 #import "TXAddViewController.h"
 6 #import "TXContact.h"
 7 @interface TXAddViewController ()
 8 //为了封装性不要把控件属性放到.h文件
 9 @property (weak, nonatomic) IBOutlet UITextField *phoneField;
10 @property (weak, nonatomic) IBOutlet UITextField *nameField;
11 @property (weak, nonatomic) IBOutlet UIButton *addBtn;
12 - (IBAction)add;
13 @end
14 
15 @implementation TXAddViewController
16 
17 - (void)viewDidLoad
18 {
19     [super viewDidLoad];
20     
21     // 监听通知
22     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.nameField];
23     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.phoneField];
24     
25     // 退出键盘
26     //    [self.nameField resignFirstResponder];
27     //    [self.view endEditing:YES];
28 }
29 
30 /**
31  *  控制器的view完全显示的时候调用
32  */
33 - (void)viewDidAppear:(BOOL)animated
34 {
35     [super viewDidAppear:animated];
36     
37     // 让姓名文本框成为第一响应者(叫出键盘)
38     [self.nameField becomeFirstResponder];
39 }
40 
41 - (void)dealloc
42 {
43     [[NSNotificationCenter defaultCenter] removeObserver:self];
44 }
45 
46 /**
47  *  文本框的文字发生改变的时候调用
48  */
49 - (void)textChange
50 {
51     self.addBtn.enabled = (self.nameField.text.length && self.phoneField.text.length);
52 }
53 
54 /**
55  *  添加
56  */
57 - (IBAction)add {
58     // 1.关闭当前控制器
59     [self.navigationController popViewControllerAnimated:YES];
60     
61     // 2.传递数据给上一个控制器(TXContactsViewController)
62     // 2.通知代理
63     if ([self.delegate respondsToSelector:@selector(addViewController:didAddContact:)]) {//代理还可以传值
64         TXContact *contact = [[TXContact alloc] init];
65         contact.name = self.nameField.text;
66         contact.phone = self.phoneField.text;
67         [self.delegate addViewController:self didAddContact:contact];
68     }
69 }
70 
71 @end

TXEditViewController.h文件

1 //  Created by 鑫 on 14-10-21.
 2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
 3 //
 4 
 5 #import <UIKit/UIKit.h>
 6 @class TXContact, TXEditViewController;
 7 
 8 @protocol TXEditViewControllerDelegate <NSObject>
 9 
10 @optional
11 - (void)editViewController:(TXEditViewController *)editVc didSaveContact:(TXContact *)contact;
12 
13 @end
14 
15 @interface TXEditViewController : UIViewController
16 //别人传一个模型给你
17 @property (nonatomic, strong) TXContact *contact;
18 
19 @property (nonatomic, weak) id<TXEditViewControllerDelegate> delegate;
20 @end

TXEditViewController.m文件

1 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
 2 //
 3 
 4 #import "TXEditViewController.h"
 5 #import "TXContact.h"
 6 @interface TXEditViewController ()
 7 @property (weak, nonatomic) IBOutlet UITextField *nameField;
 8 @property (weak, nonatomic) IBOutlet UIButton *saveBtn;
 9 @property (weak, nonatomic) IBOutlet UITextField *phoneField;
10 - (IBAction)edit:(UIBarButtonItem *)item;
11 
12 - (IBAction)save;
13 
14 
15 @end
16 
17 @implementation TXEditViewController
18 - (void)viewDidLoad
19 {
20     [super viewDidLoad];
21     
22     // 设置数据
23     self.nameField.text = self.contact.name;
24     self.phoneField.text = self.contact.phone;
25     
26     // 监听通知
27     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.nameField];
28     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.phoneField];
29 }
30 
31 - (void)dealloc
32 {
33     [[NSNotificationCenter defaultCenter] removeObserver:self];
34 }
35 
36 /**
37  *  文本框的文字发生改变的时候调用
38  */
39 - (void)textChange
40 {
41     self.saveBtn.enabled = (self.nameField.text.length && self.phoneField.text.length);
42 }
43 
44 - (IBAction)edit:(UIBarButtonItem *)item {
45     if (self.nameField.enabled) { // 点击的是"取消"
46         self.nameField.enabled = NO;
47         self.phoneField.enabled = NO;
48         [self.view endEditing:YES];
49         self.saveBtn.hidden = YES;
50         
51         item.title = @"编辑";
52         
53         // 还原回原来的数据
54         self.nameField.text = self.contact.name;
55         self.phoneField.text = self.contact.phone;
56     } else { // 点击的是"编辑"
57         self.nameField.enabled = YES;
58         self.phoneField.enabled = YES;
59         [self.phoneField becomeFirstResponder];
60         self.saveBtn.hidden = NO;
61         
62         item.title = @"取消";
63     }
64 }
65 
66 /**
67  *  保存
68  */
69 - (IBAction)save {
70     // 1.关闭页面
71     [self.navigationController popViewControllerAnimated:YES];
72     
73     // 2.通知代理
74     if ([self.delegate respondsToSelector:@selector(editViewController:didSaveContact:)]) {
75         // 更新模型数据
76         self.contact.name = self.nameField.text;
77         self.contact.phone = self.phoneField.text;
78         [self.delegate editViewController:self didSaveContact:self.contact];
79     }
80 }
81 @end

二、效果

iOS开发项目难点亮点 ios开发小项目_ui