Question

我的项目将保存数据以进行解析，而我可以从库中选择图像，但无法打开相机。我发现了一个教程，但它与我的代码不兼容。本教程的链接位于：Tutorial。我正在使用.storyboard，教程是.xib，我不知道这是否会改变任何内容。

我的.m文件在这里：

#import "NewRecipeViewController.h"
#import <MobileCoreServices/UTCoreTypes.h>
#import <Parse/Parse.h>
#import "MBProgressHUD.h"

@interface NewRecipeViewController ()
- (IBAction)save:(id)sender;
- (IBAction)cancel:(id)sender;
@property (weak, nonatomic) IBOutlet UIImageView *recipeImageView;
@property (weak, nonatomic) IBOutlet UITextField *nameTextField;
@property (weak, nonatomic) IBOutlet UITextField *prepTimeTextField;
@property (weak, nonatomic) IBOutlet UITextField *ingredientsTextField;

@end

@implementation NewRecipeViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _nameTextField.delegate = self;
    _prepTimeTextField.delegate = self;
    _ingredientsTextField.delegate = self;

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0) {
        [self showPhotoLibary];
    }
}


- (void)showPhotoLibary
{
    if (([UIImagePickerController isSourceTypeAvailable:
          UIImagePickerControllerSourceTypeSavedPhotosAlbum] == NO)) {
        return;
    }

    UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
    mediaUI.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    // Displays saved pictures from the Camera Roll album.
    mediaUI.mediaTypes = @[(NSString*)kUTTypeImage];

    // Hides the controls for moving & scaling pictures
    mediaUI.allowsEditing = NO;

    mediaUI.delegate = self;

    [self.navigationController presentModalViewController: mediaUI animated: YES];
}

- (IBAction)save:(id)sender {
    // Create PFObject with recipe information
    PFObject *recipe = [PFObject objectWithClassName:@"Recipe"];
    [recipe setObject:_nameTextField.text forKey:@"name"];
    [recipe setObject:_prepTimeTextField.text forKey:@"prepTime"];

    NSArray *ingredients = [_ingredientsTextField.text componentsSeparatedByString: @","];
    [recipe setObject:ingredients forKey:@"ingredients"];

    // Recipe image
    NSData *imageData = UIImageJPEGRepresentation(_recipeImageView.image, 0.8);
    NSString *filename = [NSString stringWithFormat:@"%@.png", _nameTextField.text];
    PFFile *imageFile = [PFFile fileWithName:filename data:imageData];
    [recipe setObject:imageFile forKey:@"imageFile"];

    // Show progress
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    hud.mode = MBProgressHUDModeIndeterminate;
    hud.labelText = @"Uploading";
    [hud show:YES];

    // Upload recipe to Parse
    [recipe saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        [hud hide:YES];

        if (!error) {
            // Show success message
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Upload Complete" message:@"Successfully saved the recipe" delegate:Nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];

            // Notify table view to reload the recipes from Parse cloud
            [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshTable" object:self];

            // Dismiss the controller
            [self dismissViewControllerAnimated:YES completion:nil];

        } else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Upload Failure" message:[error localizedDescription] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];

        }

    }];
}

- (IBAction)cancel:(id)sender {
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)viewDidUnload {
    [self setRecipeImageView:nil];
    [self setNameTextField:nil];
    [self setPrepTimeTextField:nil];
    [self setIngredientsTextField:nil];
    [super viewDidUnload];
}


- (void) imagePickerController: (UIImagePickerController *) picker didFinishPickingMediaWithInfo: (NSDictionary *) info {

    UIImage *originalImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];
    self.recipeImageView.image = originalImage;

    [picker dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark - Textfield delegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

- (IBAction)takephoto:(id)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

    [self presentViewController:picker animated:YES completion:NULL];
}

- (IBAction)selectphoto:(id)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:picker animated:YES completion:NULL];

}
@end

感谢任何帮助。

Answer 1

看看Apple提供的示例项目（尤其是APLViewController.m）

https://developer.apple.com/library/ios/samplecode/PhotoPicker/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010196

您会看到他们执行以下4个步骤。您只是在执行第一步的后半部分，而不首先验证该源类型是否可用。

来自UIImagePickerController类参考：

要使用包含其默认控件的图像选择器控制器，请执行以下步骤：

Verify that the device is capable of picking content from the desired source. Do this calling the isSourceTypeAvailable: class method, providing a constant from the “UIImagePickerControllerSourceType” enumeration.

Check which media types are available, for the source type you’re using, by calling the availableMediaTypesForSourceType: class method. This lets you distinguish between a camera that can be used for video recording and one that can be used only for still images.

Tell the image picker controller to adjust the UI according to the media types you want to make available—still images, movies, or both—by setting the mediaTypes property.

Present the user interface. On iPhone or iPod touch, do this modally (full-screen) by calling the presentViewController:animated:completion: method of the currently active view controller, passing your configured image picker controller as the new view controller.

保存图片进行解析

1 个答案: