iphone - 从相机和相机胶卷加载和保存图像时出现问题。我究竟做错了什么？

Question

我正在构建一个应用程序，您可以在其中制作图片或从相机胶卷中选择图像，并将它们保存在应用程序中以显示在表格 View 和详细 View 中。问题是，当我从应用程序内部制作图片并保存它时，表格 View 和详细 View 变得非常慢，就像应用程序卡住一样。我也收到此错误“:CGAffineTransformInvert:奇异矩阵。”。当我从相机胶卷加载一张不是从我的应用程序内部拍摄的图片时，没有问题，并且应用程序运行得非常顺利。

这是我打开相机和相机胶卷时的代码:

-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{
if (buttonIndex == actionSheet.cancelButtonIndex) {
    return;
}

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = NO;

switch (buttonIndex) {
    case 0:
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        }
        break;
    case 1:
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]) {
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        }
        break;
}

[self presentModalViewController:picker animated:YES];  
}

这是我将其保存到相机胶卷并将图像放入 imageView 中的位置:

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
UIImage *mijnImage;
if (CFStringCompare((__bridge_retained CFStringRef)mediaType, kUTTypeImage, 0)==kCFCompareEqualTo) {
    mijnImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];
    mijnPlaatje_.image = mijnImage;
    UIImageWriteToSavedPhotosAlbum(mijnImage, nil, nil, nil);

}

 [picker dismissModalViewControllerAnimated:YES]; 

}

在这里，我将图像保存在我的应用程序中:

-(IBAction)save:(id)sender{
drankjes.plaatje = [mijnPlaatje_ image];
[self dismissModalViewControllerAnimated:YES];

}

我做错了什么？

Answer 1

您需要使用:

UIImageWriteToSavedPhotosAlbum(image, self, @selector(video:didFinishSavingWithError:contextInfo), nil)

并实现:

- (void)image:(UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo {
    NSLog(@"Saving image");
    if(error != nil) {
        NSLog(@"Error saving: %@",[error localizedDescription]);
    }
}

正如 Jensen2K 所说，即使没有错误，didFinishSavingWithError 也会被调用，因此您可以使用它来告知保存何时完成。