Question

I have a blank screen on which i click camera button and take photo and than that photo appears on my blank screen as a UIVIew and i’m adding multiple images from Camera to blank screen. The problem is sometimes i can add multiple images on blank screen but sometimes when i capture image and than all images on blank screen disappear and just shows the current image.
And in LOG. it show me Received memory warning.
this is my code. i think i m now releasing my objects properly. but when i am adding [object release] in the end my app crashes.

   -(void)AddImagesToCanvasWithGesture{

    if(imageFromPicker.size.width > imageFromPicker.size.height || imageFromPicker.size.width == imageFromPicker.size.height)
    {
        holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 180, 160)];
    }
    else{
        holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 160, 240)];
    }
    UIImageView *imageview = [[[UIImageView alloc] initWithFrame:[holderView frame]];
    [imageview setImage:imageFromPicker];
    //[imageview setTag:101];
    //[holderView setTag:102];
    //NSLog(@"Tag By Default %d",(arc4random()%100)+10);
    [holderView setTag:(int)objectDelegate.tagForHolderView];
    [imageview setTag:((int)objectDelegate.tagForHolderView)+1];
    [holderView addSubview:imageview];
    //[imageview canBecomeFirstResponder];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)];
    [pinchRecognizer setDelegate:self];
    [holderView addGestureRecognizer:pinchRecognizer];

    UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    [rotationRecognizer setDelegate:self];
    [holderView addGestureRecognizer:rotationRecognizer];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [panRecognizer setDelegate:self];
    [holderView addGestureRecognizer:panRecognizer];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
    [tapRecognizer setNumberOfTapsRequired:1];
    [tapRecognizer setDelegate:self];
    [holderView addGestureRecognizer:tapRecognizer]; 


    UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(gestureHandler:)];
    [holderView addGestureRecognizer:gestureRecognizer];

    [holderView.layer setBorderColor: [[UIColor whiteColor] CGColor]];
    [holderView.layer setBorderWidth: 3.0];
    [self.view addSubview:holderView];
    objectDelegate.tagForHolderView+=2;
    for(UIButton *b in self.view.subviews) {
        if([b isKindOfClass:[UIButton class]]) {
            [self.view bringSubviewToFront:b];
        }

        [self.view sendSubviewToBack:imageViewForBackground];
        //[holderView setHidden:YES];

    }

}

how can i release them and where should i call the release method.

Answer 1

When you have a memory problem, if you have a method named

- (void)didReceiveMemoryWarning

it will get called and allow you to free up space. If you are using ARC, just set your UIImageView to nil, if not, call:

[imageview release];