UIImagePickerControllerOriginalImage 在 iPhone 4 中收到内存警告

Question

我在右上角有一个 UICollectionView 和一个条形按钮（CameraViewController1 : UICollectionViewController）。流程是当我拍照时，它移动到一个新的视图控制器，可以裁剪图像。用户有两个选项使用和取消之后选择此选项中的任何一个，它都会将图像返回到集合视图并像单元格一样排列。我想拍很多照片。但我最多可以拍 3 张照片然后应用程序崩溃

这种情况只发生在 iPhone 4 上，而不是 iPhone 5 上。

为什么应用程序只在 iPhone 4 上崩溃？相同的代码在 iPhone 5 中完美运行。

当我在图像视图中回顾时，我想要一个良好的图像质量使用UIImagePickerControllerOriginalImage 行给我提供了良好的质量，但它在 iPhone 4 中会崩溃请任何解决方案！

在这门课上我应该做些什么来消除这个内存警告（iPhone 4 中的原因）？

我尝试调整图像大小，但它给我的图像质量很差。即使调整大小后也可以获得高质量的图像吗？

请帮忙！如何摆脱这个内存警告？

这里是完整的代码：

- (void)viewDidLoad
{


    [[UIApplication sharedApplication]setStatusBarHidden:FALSE withAnimation:NO];

    [barbutton setTitleTextAttributes:@{
                                        UITextAttributeFont: [UIFont fontWithName:@"Arial" size:20.0],
                                        UITextAttributeTextColor: [UIColor blueColor]
                                        } forState:UIControlStateNormal];



  hide_backbtn=1;

    if ([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0)
    {
        [self.navigationController.navigationBar setTintColor:[UIColor blueColor]];
        [[UIBarButtonItem appearance]setTintColor:[UIColor blueColor]];
    }
    else
    {
        [self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
        [[UIBarButtonItem appearance]setTintColor:[UIColor blackColor]];

    }



    //self.collection_view.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"Bottom.png"]];

    self.collectionView.backgroundView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Bottom.png"]]autorelease];//ar

    [super viewDidLoad];
   crop_one.hidden=TRUE;
    view_refresh=3;


     selectedRecipes = [NSMutableArray array];
 //noww   imgSmall=[[[UIImage alloc]init]autorelease];//ar



    picker1 = [[UIImagePickerController alloc] init];
    picker1.delegate = self;

    if (! (picker1==nil)) {

        NSLog(@"YUCCKKK");


    }
    if ((picker1==nil)&&(original_image < 0)) {
        NSLog(@"YEEEEEEYYYYYYYYY");
    }

    // Do any additional setup after loading the view.
}




- (IBAction)TakeaPhoto:(id)sender {



        [[UIApplication sharedApplication]setStatusBarHidden:FALSE withAnimation:NO];


    gallery=0;


    picker1.sourceType = UIImagePickerControllerSourceTypeCamera;


       self.resizeableCropArea =YES;
   self.cropSize=CGSizeMake(300,350);//296, 350

   // picker1.allowsEditing = YES;

    [self presentViewController:picker1 animated:YES completion:NULL];
    [self.picker1 release];

}


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

    [self dismissViewControllerAnimated:YES completion:NULL];


    UIImage *image =[info   objectForKey:UIImagePickerControllerOriginalImage] ;


    CGSize sizeCropped = CGSizeMake(600,800);//you can give any size 320, 370
   // UIImage *theimage = nil;
 image = [self resizeImage:image newSize:sizeCropped];



     CropViewController *cropController = [[CropViewController alloc] init];

    cropController.sourceImage=image;



     cropController.sourceImage = [info objectForKey:UIImagePickerControllerOriginalImage]; //now


      Original_img = UIImageJPEGRepresentation(cropController.sourceImage,0.0);   ///////now

    [original_image addObject:[UIImage imageWithData:Original_img]]; // nowwww       



    NSLog(@"source image=%@",cropController.sourceImage);


    cropController.resizeableCropArea = self.resizeableCropArea;

    cropController.cropSize = self.cropSize;


    cropController.delegate = self;


    Cancel_Image= cropController.sourceImage;


    [self.navigationController
     pushViewController:cropController animated:YES];

    [cropController release];


}

- (UIImage *)resizeImage:(UIImage*)image newSize:(CGSize)newSize {
    CGRect newRect = CGRectIntegral(CGRectMake(0, 0, newSize.width, newSize.height));
    CGImageRef imageRef = image.CGImage;

    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();

    // Set the quality level to use when rescaling
    CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, newSize.height);

    CGContextConcatCTM(context, flipVertical);
    // Draw into the context; this scales the image
    CGContextDrawImage(context, newRect, imageRef);

    // Get the resized image from the context and a UIImage
    CGImageRef newImageRef = CGBitmapContextCreateImage(context);
    UIImage *newImage = [UIImage imageWithCGImage:newImageRef];

    CGImageRelease(newImageRef);
    UIGraphicsEndImageContext();

    return newImage;
}

//- (UIImage*)imageTemp:(UIImage*)image scaledToSize:(CGSize)newSize
//{
//  
//  UIGraphicsBeginImageContext( newSize );
//  [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];//newSize.width,newSize.height)
//    
//  UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
//  UIGraphicsEndImageContext();
//  
//  return newImage;
//    
//    
//    
//    
//}



- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {


     [picker1 dismissViewControllerAnimated:YES completion:NULL];

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{



    return [image_name count];



    //  [self.collection_view cellForItemAtIndexPath:];
}




- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{


    static NSString *identifier = @"Cell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    int row = indexPath.row;

   recipeImageView = (UIImageView *)[cell viewWithTag:100];




 //UIImage *img = [UIImage imageWithData:imageData];
    //UIImage *image = [[UIImage alloc] initWithData:imageData];

   //[recipeImageView setImage:image];
 //recipeImageView.image = image_cap;


    recipeImageView.image = (UIImage*) [image_name objectAtIndex:row];



    // cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"img.png"]];

   //cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Bottom.png"]];

 cell.backgroundColor=[UIColor blackColor];


    return cell;
}



-(void)sample
{
//    NSLog(@"%@",destViewController.recipeImageName);

}

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{

        NSString *deSelectedRecipe = [image_name objectAtIndex:indexPath.row];
        [selectedRecipes removeObject:deSelectedRecipe];

}
- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
{

        return YES;

}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{



    mt_img=1;

     NSArray *indexPaths = [self.collectionView indexPathsForSelectedItems];


    hide_backbtn=1;

    NSIndexPath *indexPath1 = [indexPaths objectAtIndex:0];
    recipeImageName = [image_name objectAtIndex:indexPath.row];

 if(appDelegate.intAddOrView==2)
 {
     hide_backbtn=20;
 }

     selected_image=indexPath.row;

    NSLog(@"%@",recipeImageName);

     [self.collectionView deselectItemAtIndexPath:indexPath1 animated:NO];

   [arrInsertReceipt replaceObjectAtIndex:0 withObject: [image_name objectAtIndex:indexPath.row]];

    [self.navigationController popViewControllerAnimated:YES]; //now

}
- (void)singleTapGestureCaptured:(UITapGestureRecognizer *)gesture
{
  // UIView *tappedView = [gesture.view hitTest:[gesture locationInView:gesture.view] withEvent:nil];
    NSLog(@"Touch event ");
    CGPoint point = [gesture locationInView:self.collectionView];
    NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:point];


    if (indexPath)
    {
        NSLog(@"Image was double tapped");
    }

}

- (void)viewWillAppear:(BOOL)animated
{
    [[UIApplication sharedApplication]setStatusBarHidden:FALSE withAnimation:NO];


    [[self navigationController] setNavigationBarHidden:NO animated:YES];



    [barbutton setTitleTextAttributes:@{
                                        UITextAttributeFont: [UIFont fontWithName:@"Arial" size:20.0],
                                        UITextAttributeTextColor: [UIColor blueColor]
                                        } forState:UIControlStateNormal];
    if ([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0)
    {
        [self.navigationController.navigationBar setTintColor:[UIColor blueColor]];
        [[UIBarButtonItem appearance]setTintColor:[UIColor blueColor]];
    }
    else
    {
        [self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
        [[UIBarButtonItem appearance]setTintColor:[UIColor blackColor]];

    }

   // [self viewDidLoad];
    [collection_view reloadData];
}

- (void)didReceiveMemoryWarning
{

       // [localarray removeAllObjects];
    [super didReceiveMemoryWarning];

    NSLog(@"CAMERA VIEW CONTROLLER 1 MEMORY WARNING");

   // NSLog(@"HERERERERER");


    // Dispose of any resources that can be recreated.
}
-(void)viewDidDisappear:(BOOL)animated{


    [original_image removeAllObjects];
    recipeImageView.image=nil;

}



@end

更新： 相机视图控制器 1 内存警告和裁剪视图控制器内存警告 是我保存在didReceiveMemoryWarning 下的 NSLog 语句

Answer 1

让我们试试这个方法：

-(UIImage *)getResizedImageForImage:(UIImage *)originalImage forSize:(CGSize)size
{
     @autoreleasepool
     {
        UIGraphicsBeginImageContext(size);

       [originalImage drawInRect:CGRectMake(0.0, 0.0, size.width, size.height) blendMode:kCGBlendModeNormal alpha:1.0];

       UIImage * finalImage = UIGraphicsGetImageFromCurrentImageContext();

       UIGraphicsEndImageContext();

       return finalImage;
     }
}

这里我们使用了@autoreleasepool，所以，它会减少内存警告。

谢谢！