Avsession gives "Memory warning " - ios

Question

I am using Avsession to capture images .
while i capture first image i will redirect user to apply effects on it and then get back to my capture image screen and i will preview image on cam capture screen .Then i will allow user to capture 3 more images and i will preview all images on cam capture screen. while i capturing my third image i will receive memory warning.
After Capturing Every image i will crop image to resize.
I have write below code in viewdidload
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
[device lockForConfiguration:nil];
[device setTorchMode:cameraFlashMode];
[device unlockForConfiguration];
[self.btnFlashLight setHidden:NO];
}
else
[self.btnFlashLight setHidden:YES];
cameraMode = AVCaptureDevicePositionBack;
firstImage.layer.borderWidth = 2.0f;
firstImage.layer.borderColor = [UIColor grayColor].CGColor;
secondImage.layer.borderWidth = 2.0f;
secondImage.layer.borderColor = [UIColor grayColor].CGColor;
thirdImage.layer.borderWidth = 2.0f;
thirdImage.layer.borderColor = [UIColor grayColor].CGColor;
forthImage.layer.borderWidth = 2.0f;
forthImage.layer.borderColor = [UIColor grayColor].CGColor;
if ([capturedImages count] == 0)
[self.btnNext setEnabled:NO];
if ([self captureManager] == nil) {
CamCaptureManager *manager = [[CamCaptureManager alloc] init];
[self setCaptureManager:manager];
[[self captureManager] setDelegate:self];
if ([[self captureManager] setupSession]) {
// Create video preview layer and add it to the UI
newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:[[self captureManager] session]];
UIView *view = [self videoPreviewView];
CALayer *viewLayer = [view layer];
[viewLayer setMasksToBounds:YES];
CGRect bounds = [view bounds];
[newCaptureVideoPreviewLayer setFrame:bounds];
[newCaptureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[viewLayer insertSublayer:newCaptureVideoPreviewLayer below:[[viewLayer sublayers] objectAtIndex:0]];
UIBezierPath *fullScreenPath = [UIBezierPath bezierPathWithRect:view.bounds];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
[fullScreenPath appendPath:[UIBezierPath bezierPathWithRoundedRect:[GeneralDeclaration generalDeclaration].cameraMaskFrame byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(0.0f, 0.0f)]];
maskLayer.fillRule = kCAFillRuleEvenOdd;
maskLayer.path = fullScreenPath.CGPath;
maskLayer.fillColor = [UIColor blackColor].CGColor;
maskLayer.opacity = 0.6f;
maskLayer.lineWidth = 1.0f;
maskLayer.strokeColor = [UIColor whiteColor].CGColor;
[viewLayer insertSublayer:maskLayer above:[[viewLayer sublayers] objectAtIndex:0]];
[self setCaptureVideoPreviewLayer:newCaptureVideoPreviewLayer];
[[self captureManager] session ].sessionPreset = AVCaptureSessionPresetPhoto;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[[[self captureManager] session] startRunning];
});
}
}
I have written Below code to process captured Image:
[[self captureManager] captureStillImage];
UIView *flashView = [[UIView alloc] initWithFrame:[[self videoPreviewView] frame]];
[flashView setBackgroundColor:[UIColor whiteColor]];
[[[self view] window] addSubview:flashView];
[UIView animateWithDuration:.4f
animations:^{
[flashView setAlpha:0.f];
}
completion:^(BOOL finished){
[flashView removeFromSuperview];
}
];
firstImage.image = nil;
secondImage.image = nil;
thirdImage.image = nil;
forthImage.image = nil;
//firstImage.userInteractionEnabled = YES;
secondImage.userInteractionEnabled = YES;
thirdImage.userInteractionEnabled = YES;
forthImage.userInteractionEnabled = YES;
for (UIImageView *subview in [firstImage subviews]) {
[subview removeFromSuperview];
}
for (UIImageView *subview in [secondImage subviews]) {
[subview removeFromSuperview];
}
for (UIImageView *subview in [thirdImage subviews]) {
[subview removeFromSuperview];
}
for (UIImageView *subview in [forthImage subviews]) {
[subview removeFromSuperview];
}
for(int i = 0; i < [capturedImages count]; i++)
{
UIImage *removeImage = [UIImage imageNamed:#"remove_image.png"];
UIImageView *removeImageView = [[UIImageView alloc] initWithImage:removeImage];
removeImageView.tag = i;
[removeImageView setCenter:CGPointMake(firstImage.bounds.size.width/2, firstImage.bounds.size.height/2)];
UITapGestureRecognizer *removeImageTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(removeImage_Tapped:)];
removeImageTap.numberOfTapsRequired = 1;
removeImageView.userInteractionEnabled = YES;
[removeImageView addGestureRecognizer:removeImageTap];
switch (i) {
case 0:
firstImage.image = [capturedImages objectAtIndex:i];
//[firstImage addSubview:removeImageView];
break;
case 1:
secondImage.image = [capturedImages objectAtIndex:i];
[secondImage addSubview:removeImageView];
break;
case 2:
thirdImage.image = [capturedImages objectAtIndex:i];
[thirdImage addSubview:removeImageView];
break;
case 3:
forthImage.image = [capturedImages objectAtIndex:i];
[forthImage addSubview:removeImageView];
break;
default:
break;
}
}
Please help me to solve.

Answer 1

Set property sessionPreset like this:
[yourcamera session].sessionPreset = AVCaptureSessionPresetHigh
This will not totally remove memory warning but may help to reduce it.