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Editorial Team
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Asked: 2026-05-25T23:33:55+00:00

I have a UIImageView with an image already set, and try to add a

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I have a UIImageView with an image already set, and try to add a CALayer as a subview. It works (sublayer count rises from 0 to 1) but nothing happens on the screen. Even if I try to set the layer background to black or set hidden to ‘No’..

 CALayer*layer=[[CALayer alloc]initWithLayer:anotherUIImageView.layer];

[myUIImageVIew.layer addSublayer:layer];

[[myUIImageView.layer.sublayers objectAtIndex:0] setHidden:NO];
[[myUIImageView.layer.sublayers objectAtIndex:0] setBackgroundColor:[UIColor blackColor]];

Any idea?

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1 Answer

  1. Editorial Team

    Set some bounds to the layer and assign a colour, so you can see it

    CALayer* layer = [CALayer layer];
layer.bounds = CGMakeRect(0, 0, 10, 20);
layer.backgroundColor = [[UIColor greenColor] CGColor];
[myUIImageVIew.layer addSublayer:layer];

    Also, from the documentaion of [CALayer initWithLayer:]:

    Note: Invoking this method in any other situation will produce undefined behavior. Do not use this method to initialize a new layer with an existing layer’s content.

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