I'm trying to minimize the amount of memory with UIImagePickerController, but I'm starting to think that the memory problems that arise in me are due to poor memory management, and not for a specific way of handling the object UIImagePickerController.
My workflow is this: the "Change Image" button is pressed, which represents <<22>. This action sheet allows you to delete, take a picture, select from a library, or cancel. If you select "Select from library" or "Capture image", I alloccopy UIImagePickerControllerand submit it, and then release UIImagePickerController:
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (actionSheet.tag != 999) {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
BOOL pickImage = nil;
if (actionSheet.tag == iPhoneWithDelete) {
switch (buttonIndex) {
case 0:
object.objectImage = nil;
pickImage = NO;
break;
case 1:
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
pickImage = YES;
break;
case 2:
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
pickImage = YES;
break;
default:
pickImage = NO;
break;
}
} else if (actionSheet.tag == iPhoneNoDelete) {
switch (buttonIndex) {
case 0:
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
pickImage = YES;
break;
case 1:
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
pickImage = YES;
break;
default:
pickImage = NO;
break;
}
} else if (actionSheet.tag == iPodWithDelete) {
switch (buttonIndex) {
case 0:
object.objectImage = nil;
pickImage = NO;
break;
case 1:
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
pickImage = YES;
break;
default:
pickImage = NO;
break;
}
} else if (actionSheet.tag == iPodNoDelete) {
switch (buttonIndex) {
case 0:
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
pickImage = YES;
break;
default:
pickImage = NO;
break;
}
}
if (pickImage) {
imagePicker.allowsEditing = YES;
[self presentModalViewController:imagePicker animated:YES];
} else {
[self setupImageButton];
[self setupChooseImageButton];
}
[imagePicker release];
}
}
UIImagePickerController, 2 , 800x600 (Transformational, UIImage PNG, Recipes) : ( , SO).
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self dismissModalViewControllerAnimated:YES];
NSManagedObject *oldImage = object.imageFull;
if (oldImage != nil)
{
[object.managedObjectContext deleteObject:oldImage];
}
NSManagedObject *image = [NSEntityDescription insertNewObjectForEntityForName:@"Image" inManagedObjectContext:object.managedObjectContext];
object.imageFull = image;
UIImage *rawImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
CGSize size = CGSizeMake(800, 600);
UIImage *fullImage = [UIImageManipulator scaleImage:rawImage toSize:size];
[image setValue:fullImage forKey:@"imageFull"];
UIImage *processedImage = [UIImageManipulator scaleImage:[info objectForKey:@"UIImagePickerControllerEditedImage"] toSize:CGSizeMake(75, 75)];
object.objectImage = processedImage;
[self setupImageButton];
[self setupChooseImageButton];
rawImage = nil;
fullImage = nil;
processedImage = nil;
}
viewDidUnload, self.object = nil [object release] dealloc, 10 , 20. , . ?
, , ? .
- EDIT -
, . , . .
- EDIT 2 -
, chrissr, GCD . , ? 20 . , UIImage UIImagePickerController , , UIImagePickerController. 2 . , . ?
:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self dismissModalViewControllerAnimated:YES];
if (object.imagePath != nil) {
[self deleteImages];
}
dispatch_queue_t image_queue;
image_queue = dispatch_queue_create("com.gordonfontenot.app", NULL);
dispatch_async(image_queue, ^{
NSDate *now = [NSDate date];
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:@"yyyyMMDDHHmmss"];
NSString *imageName = [NSString stringWithFormat:@"Image-%@-%i", [f stringFromDate:now], arc4random() % 100];
NSString *thumbName = [NSString stringWithFormat:@"%@-thumb", imageName];
[f release];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:imageName];
NSString *thumbPath = [documentsDirectory stringByAppendingPathComponent:thumbName];
NSData *thumbImageData = UIImagePNGRepresentation([UIImageManipulator scaleImage:[info objectForKey:@"UIImagePickerControllerEditedImage"] toSize:CGSizeMake(120, 120)]);
[thumbImageData writeToFile:thumbPath atomically:NO];
dispatch_async(dispatch_get_main_queue(), ^{
object.thumbPath = thumbPath;
[self setupImageButton];
imageButton.enabled = NO;
[self setupChooseImageButton];
});
NSData *fullImageData = UIImagePNGRepresentation([UIImageManipulator scaleImage:[info objectForKey:@"UIImagePickerControllerOriginalImage"] toSize:CGSizeMake(800, 600)]);
[fullImageData writeToFile:fullPath atomically:NO];
dispatch_async(dispatch_get_main_queue(), ^{
imageButton.enabled = YES;
object.imagePath = fullPath;
});
if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
UIImageWriteToSavedPhotosAlbum([info objectForKey:@"UIImagePickerControllerOriginalImage"], self, nil, nil);
}
});
dispatch_release(image_queue);
}