ios开发之调用相机和本地相册

ios调用本地相机和相册, 非常实用的小功能, 一般做上传头像的时候会用到的比较多. 我用的是iPhone5做的测试, 没有出现什么问题. 用真机测试的主要原因是模拟器无法实现拍照功能, 拍照功能只能在真机上调用.下面是我的一些代码, 写的比较粗糙, 但是简单易懂.

// 首先来写一些委托 定义一个全局变量
@interface TestViewController : UIViewController<UIActionSheetDelegate,UIImagePickerControllerDelegate>
{
    UIActionSheet *myActionSheet;
}

　　以上是.h中的代码, 接下来开始写.m中的 至于window创建我就不给列出了

// 首先创建一个button和一个imageView button点击调出拍照或本地相册上传图片方法, imageView负责显示图片 , 把他们都加入到view中
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);
    button.backgroundColor = [UIColor redColor];

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

    [self.view addSubview:button];

    self.img = [[UIImageView alloc] initWithFrame:
                               CGRectMake(0, 220, self.view.frame.size.width, self.view.frame.size.height)]; // 这个imageView我设置的比较大了一点 - -
    self.img.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:_img];

　　接下来是button的点击方法

-(void)openMenu
{
    //这里面用的是ActionSheet
    myActionSheet = [[UIActionSheet alloc]
                 initWithTitle:nil
                 delegate:self
                 cancelButtonTitle:@"取消"
                 destructiveButtonTitle:nil
                 otherButtonTitles: @"打开相机", @"从相册获取",nil];

    [myActionSheet showInView:self.view];  

}

　　然后是ActionSheet的代理方法 和 拍照与本地相册的调用功能实现

- (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;
        [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];
}

UIImagePickerController的代理方法:

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

        _img.image = image;

    } 

}

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

　　这样就ok了