How can I remove or hide a sublayer?

Question

-(IBAction)displayinfo:(id)sender
{
    sublayer = [CALayer layer];

    if (appear == NO)
    {
        appear = YES;
        sublayer.contents=(id)[UIImage imageNamed:@"infoPalette.png"].CGImage;
        sublayer.frame= CGRectMake(300,200,350,250);
        [self.view.layer addSublayer:sublayer];
    }
    else
    {
        [sublayer removeFromSuperlayer];
    }
}

This allows the layer to appear but I can't remove it or hide it upon clicking the same button.

possible duplicate of [xcode Removing Some Subviews from view](http://stackoverflow.com/questions/4136733/xcode-removing-some-subviews-from-view) — Vinay Jain, Dec 03 '13 at 11:18

Pradhyuman sinh · Accepted Answer · 2013-12-03T11:32:09.597

10

Replace your existing code with this one

-(IBAction)displayinfo:(id)sender
{

    if ( appear == NO)
    {
         sublayer = [CALayer layer];
         appear = YES;
         sublayer.contents=(id)[UIImage imageNamed:@"infoPalette.png"].CGImage;
         sublayer.frame= CGRectMake(300,200,350,250);
         [self.view.layer addSublayer:sublayer];
    }
    else
    {
        [sublayer removeFromSuperlayer];
    }
}

edited Dec 03 '13 at 11:32

answered Dec 03 '13 at 10:59

Pradhyuman sinh

3,936
1
23
38

are you replace self.view with your UIImageview name because you want to remove UIImageview's sub view – Pradhyuman sinh Dec 03 '13 at 11:13
ok ... where are you applying sublayer? To UIImageview or to UIView? – Pradhyuman sinh Dec 03 '13 at 11:18
no i didn't replace anything just i copy paste of the code that you have been written it – Rola Masrie Dec 03 '13 at 11:18
ok ok i got it. I think there is no require to post same comment again and again – Pradhyuman sinh Dec 03 '13 at 11:20
ya i know but i got a spelling error this why i repeat it again – Rola Masrie Dec 03 '13 at 11:22
@RolaMasrie ok let's check me – Pradhyuman sinh Dec 03 '13 at 11:23
@RolaMasrie hi i got your solution – Pradhyuman sinh Dec 03 '13 at 11:29
@RolaMasrie put sublayer = [CALayer layer]; inside your if condition from outside – Pradhyuman sinh Dec 03 '13 at 11:32
@RolaMasrie are you got your answer? – Pradhyuman sinh Dec 03 '13 at 11:35
@RolaMasrie ok thank you man... call me anytime whenever you want to help.. thank you again ... – Pradhyuman sinh Dec 03 '13 at 12:04
@RolaMasrie oh... i'm really sorry... :) – Pradhyuman sinh Dec 04 '13 at 07:12
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/42466/discussion-between-pradhyuman-chavda-and-rola-masrie) – Pradhyuman sinh Dec 04 '13 at 07:14
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/42632/discussion-between-pradhyuman-chavda-and-rola-masrie) – Pradhyuman sinh Dec 06 '13 at 08:46

score 6 · Answer 2 · answered Dec 11 '14 at 08:50

In my case where I added multiple sublayers to my background imageView, I removed all of them using

 for (int i = 0 ; i < [self.backgroundImageView.layer.sublayers count]; i++ ) {
        [[self.backgroundImageView.layer.sublayers objectAtIndex:i] removeFromSuperlayer];
    }

Note: I also iterated like this

 for (CALayer *layer in self.backgroundImageView.layer.sublayers) {
      [layer removeFromSuperlayer];
 }

but this results in BadAccess, probably the reason that I added some CAGradientLayer to backgroundImageView.Layer. (it doesn't make much sense though).

This call is quicker and easier:
`[image.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)];` — Chad Hine, Nov 10 '15 at 18:45

Hani Ibrahim · Answer 3 · 2013-12-03T11:39:27.160

0

You change the code to be

- (IBAction)displayinfo:(id)sender{
if (appear == NO){
    sublayer = [CALayer layer];
    appear = YES;
    sublayer.contents=(id)[UIImage imageNamed:@"infoPalette.png"].CGImage;
    sublayer.frame= CGRectMake(300,200,350,250);
    [self.view.layer addSublayer:sublayer];
}
else {
    [sublayer removeFromSuperlayer];
}}

Sorry!, repeated solution

edited Dec 03 '13 at 11:39

answered Dec 03 '13 at 11:20

Hani Ibrahim

1,448
11
21

Thanks hani your answer was so helpfull – Rola Masrie Dec 03 '13 at 11:39

How can I remove or hide a sublayer?

3 Answers3