ios开发 简易备忘录

主要实现三个功能：显示备忘录，新建备忘录，备忘录的详细信息（可以显示图片）

 

     这个备忘录程序是一个很简单的小项目，不过里边包含了不少重要的知识，如TableView的用法，文本、图片的保存等。

     新建“Empty Application” ，命名为MemorandumBook

     新建三个UIViewController视图，分别命名为HomeViewController，AddViewController,DetailsViewController。三个视图分别来实现对应的三个功能。

1.在AppDelegate.m中添加代码：

   (1)添加导航控制器

   (2) 将homeViewController添加到导航器

   (3) 将导航器添加到启动的主视图

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    
    navigationController = [[UINavigationController alloc] init];
    HomeViewController *homeViewController = [[HomeViewController alloc] init];
    
    homeViewController.title = @"备忘录";

    [navigationController pushViewController:homeViewController animated:NO];//压入栈
    [self.window addSubview:navigationController.view];
    [homeViewController release];
    
    [self.window makeKeyAndVisible];
    return YES;
}

 2.

 

下面在HomeViewController视图，来实现上图的效果：

 添加一个data.plist,存放备忘录

 

 在该视图上添加一个TableView， 在HomeViewController上添加 NSMutableArray *booksArray 存放备忘录信息，添加 - (void)initData方法，来读取plist中的数据

 //  HomeViewController.h

#import <UIKit/UIKit.h>

@interface HomeViewController : UIViewController
@property (retain, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, retain) NSMutableArray *booksArray;

- (void)initData;

- (void)didFinishAddingNewBook:(NSDictionary *)theBook;

@end

 //  HomeViewController.m

#import "HomeViewController.h"
#import "AddBookViewController.h"
#import "DetailsViewController.h"

@interface HomeViewController ()

@end

@implementation HomeViewController

@synthesize tableView;
@synthesize booksArray;

//数据显示到主视图中
- (void)initData
{
    //读取data.plist数据
    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"data" ofType:@"plist"];
    booksArray = [[NSMutableArray alloc]initWithContentsOfFile:filePath];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //数据保存
    /*booksArray是程序的数据源，在开发的时候，从data.plist中读出数据赋值给它。在程序结束之前，所有的更改都需要被保存到data.plist中去。要做到这点，可以让BookTableViewController在“感知”到程序快要结束时保存数据*/
    //为对象添加一个“观察者”
    UIApplication *app = [UIApplication sharedApplication];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:app];
    
    
    [self initData];//显示数据
    
    //左Bar
    UIBarButtonItem *leftBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editAction:)] autorelease];
    self.navigationItem.leftBarButtonItem = leftBarBtn;
    
    //右Bar
    UIBarButtonItem *rightBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addAction:)] autorelease];
    self.navigationItem.rightBarButtonItem = rightBarBtn;
    
    //self.view.backgroundColor =[UIColor colorWithPatternImage:[UIImage imageNamed:@"bg.png"]];
    
    //设置背景
    CGRect frame = self.view.bounds;
    UIImageView *bg = [[UIImageView alloc] initWithFrame:frame];
    bg.image = [UIImage imageNamed:@"bg.png"];
    [self.view addSubview:bg];
    [bg release];
    
    self.tableView = [[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.tableView.backgroundColor = [UIColor clearColor];
    self.tableView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
    [self.view addSubview:self.tableView];
    
    
}

- (void)addAction:(id)sender
{
    //导航到添加视图
    AddBookViewController *addBookViewController = [[AddBookViewController alloc] init];
    addBookViewController.delegate = self;//添加完成后回调到本视图(BookViewController)的方法
    [self.navigationController pushViewController:addBookViewController animated:YES];
    [addBookViewController release];
}

- (void)editAction:(id)sender
{
    [self.tableView setEditing:YES animated:YES];
    
    UIBarButtonItem *leftBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneAction:)] autorelease];
    self.navigationItem.leftBarButtonItem = leftBarBtn;
    
}

//又把视图的编辑转态改了回去，同时也把左按钮改了回去。
- (void)doneAction:(id)sender
{
    [self.tableView setEditing:NO animated:YES];
    
    UIBarButtonItem *leftBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editAction:)] autorelease];
    self.navigationItem.leftBarButtonItem = leftBarBtn;
    
}



//表视图的委托方法
//指定单元格的个数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [booksArray count];
}

//单元格对象
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    
    cell.textLabel.text = [[booksArray objectAtIndex:indexPath.row] valueForKey:@"Text"];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;//单元格右边的显示为一个箭头，用以提示用户点击后展开
    
    
    return cell;
}

//选中某行
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    DetailsViewController *detailsViewController = [[DetailsViewController alloc] init];
    detailsViewController.bookDictionary = [booksArray objectAtIndex:indexPath.row];//将选中的值传递到详细视图页
    [self.navigationController pushViewController:detailsViewController animated:YES];//导航到详细视图
    [detailsViewController release];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

//编辑，删除
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        //从数据源中删除该行
        
        //删除图片
        NSString *filePath = [[booksArray objectAtIndex:indexPath.row] valueForKey:@"Image"];
        if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
        {
            [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
        }
        
        [booksArray removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight];
    }
    else if (editingStyle == UITableViewCellEditingStyleInsert)
    {
        //创建相应类的实例，插入到数组中，并且向表中增加一行
    }
}

- (void)didFinishAddingNewBook:(NSDictionary *)theBook
{
    [booksArray addObject:theBook];
    [self.tableView reloadData];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    
}

//程序快要结束时调用
- (void)applicationWillTerminate:(UIApplication *)application
{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"];//找到文件路径
    [booksArray writeToFile:path atomically:YES];//写入
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)dealloc {
    [tableView release];
    [super dealloc];
}
@end

 3.

 

 下面来实现AddViewController视图：

在xib上添加ImageView,Label，2个Button，如上图布局。

 Button“添加文本”的方法:

 用到UITextViewDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate,UIActionSheetDelegate 等协议

- (void)addText:(id)sender{
    UIBarButtonItem *rightBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneEditing:)] autorelease];
    self.navigationItem.rightBarButtonItem = rightBarBtn;
    
    textView = [[UITextView alloc] initWithFrame:CGRectMake(0, -240, 320, 240)];
    textView.text = textLabel.text;
    [self.view addSubview:textView];
    
    [UIView beginAnimations:@"pushAnimation" context:textView];
    [UIView setAnimationCurve:0.2];
    [textView setFrame:CGRectMake(0, 0, 320, 240)];
    [UIView commitAnimations];
    [textView becomeFirstResponder];
}

//完成编辑
- (void)doneEditing:(id)sender
{
    //textView弹回，取消其第一响应者身份（键盘弹回）
    [textView resignFirstResponder];
    [UIView beginAnimations:@"popAnimation" context:textView];
    [UIView setAnimationDuration:0.2];
    [textView setFrame:CGRectMake(0, -240, 320, 240)];
    [UIView commitAnimations];
    
    [textLabel setText:textView.text];
    
    //右bar恢复“done”
    UIBarButtonItem *rightBarBtn = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone 
                                                                                  target:self 
                                                                                  action:@selector(doneAction:)] autorelease];
    self.navigationItem.rightBarButtonItem = rightBarBtn;
}

  Button“添加图片”的方法:

   - (IBAction)addImage:(id)sender{  UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil 

                                                             delegate:self 
                                                    cancelButtonTitle:@"取消" 
                                               destructiveButtonTitle:@"拍照" 
                                                    otherButtonTitles:@"选择照片", nil];
    [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
}


//UIImagePickerControllerDelegate的委托方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    image = [info objectForKey:UIImagePickerControllerEditedImage];
    [imageView setImage:image];
    [picker dismissModalViewControllerAnimated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissModalViewControllerAnimated:YES];
    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
}

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    UIImagePickerController *imagePicker = [[[UIImagePickerController alloc] init] autorelease];
    imagePicker.allowsImageEditing = YES;
    if (buttonIndex == 0) 
    {
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            //imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        }
        else
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"没有相机" 
                                                            message:nil 
                                                           delegate:nil 
                                                  cancelButtonTitle:@"关闭" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
            return;
        }
    }
    else if (buttonIndex == 1)
    {
        //imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    else if (buttonIndex == 2)
    {
        return;
    }
    
    imagePicker.delegate = self;
    [self presentModalViewController:imagePicker animated:YES];
}

- (void)doneAction:(id)sender
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *filePath = [paths objectAtIndex:0];
    NSString *fileName = [NSString stringWithFormat:@"%d.png",random()];
    filePath = [filePath stringByAppendingPathComponent:fileName];
    
    //NSData *imageData = UIImageJPEGRepresentation(image,1.0f);//取1.0代表最佳品质
    NSData *imageData = UIImagePNGRepresentation(image);//取1.0代表最佳品质
    
    if (imageData)
    {
        [[NSFileManager defaultManager] createFileAtPath:filePath contents:imageData attributes:nil];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil 
                                                        message:@"请选择照片" 
                                                       delegate:nil 
                                              cancelButtonTitle:@"确认" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    if ([textLabel.text isEqualToString:@""])
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入备忘" delegate:nil cancelButtonTitle:@"确认" otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    
    NSDictionary *newBook = [[NSDictionary alloc] initWithObjectsAndKeys:textLabel.text, @"Text", filePath, @"Image", nil];
    [delegate performSelector:@selector(didFinishAddingNewBook:) withObject:newBook];
    [self.navigationController popViewControllerAnimated:YES];
}

 4.

 

 下面来实现DetailsViewController视图：

这个只需要将文本和图片读出来，所以比较简单 

 //  DetailsViewController.m

#import "DetailsViewController.h"

@interface DetailsViewController ()

@end

@implementation DetailsViewController
@synthesize imageView;
@synthesize textView;
@synthesize bookDictionary;


- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.navigationItem.title = @"详细信息";
    
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:[bookDictionary valueForKey:@"Image"]];
    
    if (image)
    {
        [imageView setImage:image];
    }
    [image release];
    textView.text = [bookDictionary valueForKey:@"Text"];
}

- (void)viewDidUnload
{

    [self setTextView:nil];
    [self setImageView: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 {
 
    [textView release];
    [imageView release];
    [super dealloc];
}
@end