IOS研究院之打开照相机与本地相册选择图片（六）

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Hello 大家好 IOS的文章好久都木有更新了，今天更新一篇哈。 这篇文章主要学习如何在IOS程序中打开照相机与本地相册并且选择一张图片。还是老样子MOMO写了一个简单的测试程序，如下图所示 在本地相册中选择一张图片后，我们将他拷贝至沙盒当中，在客户端中将它的缩略图放在按钮旁边，这个结构其实和新浪微薄中选择图片后的效果一样。最终点击发送将按钮将图片2进制图片上传服务器。

下面我们仔细学习具体的细节。创建一个空的IOS项目，接着在创建一个ViewController。

AppDelegate.h 应用的代理类 这个没什么好说的就是直接打开刚刚创建的新ViewController。

#import <UIKit/UIKit.h>
#import "TestViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navController;
@property (strong, nonatomic) UIViewController *viewController;
@end

AppDelegate.m 在这里就是打开我们创建的TestViewController

#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize navController;
@synthesize viewController;

- (void)dealloc
{
    [_window release];
    [super dealloc];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    self.window.backgroundColor = [UIColor whiteColor];
    self.viewController =  [[TestViewController alloc]init];
    self.navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    [self.window addSubview:navController.view];

    [self.window makeKeyAndVisible];
    return YES;
}

@end

TestViewController.h 注意这里面引入了很多代理类。

#import <UIKit/UIKit.h>

@interface TestViewController : UIViewController<UITextViewDelegate,UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>
{
    //输入框
    UITextView *_textEditor;

    //下拉菜单
    UIActionSheet *myActionSheet;

    //图片2进制路径
    NSString* filePath;
}
@end

TestViewController.m 请大家仔细看这个类， 所有的东西都写在了这里哈。

#import "TestViewController.h"

@interface TestViewController ()

@end

@implementation TestViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //导航栏标题
	self.navigationItem.title = @"雨松MOMO输入框";

    //导航栏按钮
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]
                                               initWithTitle: @"发送"
                                               style: UIBarButtonItemStyleDone
                                               target: self
                                               action: @selector(sendInfo)] autorelease];

    //输入框显示区域
    _textEditor = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];
    //设置它的代理
    _textEditor.delegate = self;
    _textEditor.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    _textEditor.keyboardType = UIKeyboardTypeDefault;
    _textEditor.font = [UIFont systemFontOfSize:20];
    _textEditor.text = @"请输入内容";

    //默认软键盘是在触摸区域后才会打开
    //这里表示进入当前ViewController直接打开软键盘
    [_textEditor becomeFirstResponder];

    //把输入框加在视图中
    [self.view addSubview:_textEditor];

    //下方的图片按钮 点击后呼出菜单 打开摄像机 查找本地相册
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"camera" ofType:@"png"]];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(0, 120, image.size.width, image.size.height);

    [button setImage:image forState:UIControlStateNormal];

    [button addTarget:self action:@selector(openMenu) forControlEvents:UIControlEventTouchUpInside];

    //把它也加在视图当中
    [self.view addSubview:button];

}

-(void)openMenu
{
    //在这里呼出下方菜单按钮项
    myActionSheet = [[UIActionSheet alloc]
                 initWithTitle:nil
                 delegate:self
                 cancelButtonTitle:@"取消"
                 destructiveButtonTitle:nil
                 otherButtonTitles: @"打开照相机", @"从手机相册获取",nil];  

    [myActionSheet showInView:self.view];
    [myActionSheet release];    

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{ 

    //呼出的菜单按钮点击后的响应
    if (buttonIndex == myActionSheet.cancelButtonIndex)
    {
        NSLog(@"取消");
    }

    switch (buttonIndex)
    {
        case 0:  //打开照相机拍照
            [self takePhoto];
            break; 

        case 1:  //打开本地相册
            [self LocalPhoto];
            break;
    }
}

//开始拍照
-(void)takePhoto
{
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        //设置拍照后的图片可被编辑
        picker.allowsEditing = YES;
        picker.sourceType = sourceType;
        [picker release];
        [self presentModalViewController:picker animated:YES];
    }else
    {
        NSLog(@"模拟其中无法打开照相机,请在真机中使用");
    }
}

//打开本地相册
-(void)LocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    //设置选择后的图片可被编辑
    picker.allowsEditing = YES;
    [self presentModalViewController:picker animated:YES];
    [picker release];
}

//当选择一张图片后进入这里
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

    //当选择的类型是图片
    if ([type isEqualToString:@"public.image"])
    {
        //先把图片转成NSData
        UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        NSData *data;
        if (UIImagePNGRepresentation(image) == nil)
        {
            data = UIImageJPEGRepresentation(image, 1.0);
        }
        else
        {
            data = UIImagePNGRepresentation(image);
        }

        //图片保存的路径
        //这里将图片放在沙盒的documents文件夹中
        NSString * DocumentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];  

        //文件管理器
        NSFileManager *fileManager = [NSFileManager defaultManager];

        //把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png
        [fileManager createDirectoryAtPath:DocumentsPath withIntermediateDirectories:YES attributes:nil error:nil];
        [fileManager createFileAtPath:[DocumentsPath stringByAppendingString:@"/image.png"] contents:data attributes:nil];

        //得到选择后沙盒中图片的完整路径
        filePath = [[NSString alloc]initWithFormat:@"%@%@",DocumentsPath,  @"/image.png"];

        //关闭相册界面
        [picker dismissModalViewControllerAnimated:YES];

        //创建一个选择后图片的小图标放在下方
        //类似微薄选择图后的效果
        UIImageView *smallimage = [[[UIImageView alloc] initWithFrame:
                                   CGRectMake(50, 120, 40, 40)] autorelease];    

        smallimage.image = image;
        //加在视图中
        [self.view addSubview:smallimage];

    } 

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"您取消了选择图片");
    [picker dismissModalViewControllerAnimated:YES];
}

-(void)sendInfo
{
    NSLog(@"图片的路径是：%@", filePath);

    NSLog(@"您输入框中的内容是：%@", _textEditor.text);
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

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

@end

如下图所示，打开下拉菜单按钮开始选择打开相机 或者 打开本地相册。模拟器中是无法打开照相机的的，切记。

如下图所示，这里就是我本地的相册啦，里面保存了几张图片，选择一张即可。

我在这里再说说图片上传， 图片上传我们采用的是2进制ASIHTTPRequest 来完成的。

发送请求

    NSString *server_base = [NSString stringWithFormat:@"%@/users/uploadResource.json", _server];

    ASINetworkQueue *queue = [[ASINetworkQueue alloc] init];  

    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:server_base]];

    [ASIHTTPRequest setShouldUpdateNetworkActivityIndicator: NO];
    [request setDelegate :self];
    [request setDidFinishSelector:@selector(sendCommentSucc:)];
    [request setDidFailSelector:@selector(sendCommentFail:)];
    // res 就是 需要上传图片文件的路径
    [request setFile:res forKey:@"res"];

    [queue addOperation:request];
    [queue go];

最后是文本的源码，雨松MOMO祝大家学习愉快，不早了，我也得睡觉啦，1点多了。。。

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