uiimagepickercontrolleroriginalimage记忆waring

Question

我有一个集合视图（UICollectionViewController的子类），我放置了一个名为“拍照”的UIBarButtonItem。当我点击酒吧按钮项目我的相机打开&我拍照。在我的项目中，从相机“使用照片”之后，它将移动到裁剪视图控制器，在从裁剪视图中选择图像后裁剪图像，图像放置在我的收藏夹视图中当前控制器。在裁剪视图中，我有两个按钮使用和取消。我的问题是，当我采取奇怪的2,3或4我收到控制台内存警告，然后应用程序崩溃与警报“应用程序终止，由于内存压力”。我一直在使用这段代码，当我使用UIImagePickerControllerEditedImage时，如果我使用UIImagePickerControllerOriginalImage，则会出现内存问题。

我的问题是提供良好的图像质量，这UIImagePickerControllerOriginalImage提供了良好的质量，比UIImagePickerControllerEditedImage。我必须摆脱这种记忆问题的，所以我用这条线[self dismissViewControllerAnimated:YES completion:NULL];但我不能够清除内存警告。

- (IBAction)TakeaPhoto:(id)sender { 

[[UIApplication sharedApplication]setStatusBarHidden:FALSE withAnimation:NO]; 
    gallery=0; 
picker1 = [[UIImagePickerController alloc] init]; 
    picker1.delegate = self; 
    self.resizeableCropArea =YES; 
    self.cropSize=CGSizeMake(296, 350); 
     picker1.sourceType = UIImagePickerControllerSourceTypeCamera; 
    [self presentViewController:picker1 animated:YES completion:NULL]; 
} 

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

    UIImage *image = [info objectForKey: 
            UIImagePickerControllerOriginalImage]; 

    image_cap = [self imageTemp:image scaledToSize:CGSizeMake(320, 370)]; 

    dataTemp = UIImageJPEGRepresentation(image,0.0); 

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

    cropController.sourceImage = [info objectForKey:UIImagePickerControllerOriginalImage]; 


    Original_img = UIImageJPEGRepresentation(cropController.sourceImage,0.0); 

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

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

    cropController.resizeableCropArea = self.resizeableCropArea; 

    cropController.cropSize = self.cropSize; 

    cropController.delegate = self; 

    Cancel_Image= cropController.sourceImage; 

    [self dismissViewControllerAnimated:YES completion:NULL]; 

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

Answer 1

也许你应该压缩你的JPEG图像。例如，如果你需要，你的图像尺寸大于70KB少，你可以使用此代码：

float compressionRate = 0.90; // Initial compression rate 
    float maxCompressionRate = 0.10; // Max compression rate 

    NSData *data = UIImageJPEGRepresentation(outputImage, compressionRate); 
    // Our limit of size is MAX_UPLOAD_SIZE (70000) and compressionRate is 0.03f 
    while ([data length] > MAX_UPLOAD_SIZE && compressionRate >= maxCompressionRate) { 
     compressionRate -= 0.03; 
     data = UIImageJPEGRepresentation(outputImage, compressionRate); 
    } 

注：与你以字节为单位所需的大小，你可以编辑MAX_UPLOAD_SIZE。