Question

我在下一行的图片选择器Use of undeclared identifier 'imagePickerController'代表中收到错误didFinishPickingMediaWithInfo：

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

我已经将协议添加到界面中：

@interface MyMediaController : UIViewController <UICollectionViewDelegate, UICollectionViewDataSource, UIImagePickerControllerDelegate, UINavigationControllerDelegate>

另外，我添加了与二进制文件链接的MobileCoreServices.framework二进制文件，并将其导入为：

#import <MobileCoreServices/MobileCoreServices.h>

这就是我实例化imagePicker的方式：

- (IBAction)takePhotoButtonAction:(id)sender {
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        imagePicker.mediaTypes = @[(NSString *) kUTTypeImage];
        imagePicker.allowsEditing = NO;
        [self presentViewController:imagePicker animated:YES completion:nil];
        self.isNewMedia = YES;
    }
}

有关我为何收到此错误的任何想法？这很奇怪，因为这在以前工作，似乎没有特别的原因停止工作。

编辑：这是错误行之前的代码：

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return CGSizeMake(collectionView.bounds.size.width / 2 - 15, 150);
}

- (MyMediaCollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    MyMediaCollectionViewCell *cell = (MyMediaCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"MyMediaCollectionViewCell" forIndexPath:indexPath];
    AccountModel *account = [AccountModel getInstance];
    NSString *fileName = [[self.mediaResults objectAtIndex:indexPath.row] objectForKey:@"filename"];
    NSString *urlPath = [NSString stringWithFormat:@"https://s3-us-west-2.amazonaws.com/developd/premium_media/%@/thumb.%@", account._id, fileName];

    [NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlPath]] queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
    UIImage *cellImage = [UIImage imageWithData:data];
    cell.imageView.image = cellImage;
    [cell setTag:indexPath.row];

    return cell;
}

#pragma mark UIImagePickerControllerDelegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSString *mediaType = info[UIImagePickerControllerMediaType];

    [self dismissViewControllerAnimated:YES completion:nil];

    // ...
}

Answer 1

如果didFinishPickingMediaWithInfo之前的方法中的大括号或圆括号不匹配，您可能会遇到这些类型的神秘错误。如果选择所有代码然后按 control - i （或选择“编辑器” - “结构” - “重新缩进”），则可以识别缺失的大括号当它重新缩进你的代码时，丢失的括号会跳出来。

在这种情况下，这是因为completionHandler方法的sendAsynchronousRequest块未在前面的方法cellForItemAtIndexPath中终止。

使用未声明的标识符＆＃39; imagePickerController＆＃39;

1 个答案: