How to check if an image is within a particular subview.

Discussion in 'iOS Programming' started by BarryK88, Apr 13, 2011.

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  1. BarryK88, Apr 13, 2011

    BarryK88 macrumors member

    Joined:
    Mar 1, 2011
    #1
    I've got several images inside a scrollview and within my normal view. I'd like to check by means of an "if statement" if this image is inside my scrollview or not.

    i put my images inside the scroller with:

    Code:
    [scroller insertSubview:image belowSubview:self.view];
    thanks in advance!
     
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  2. robbieduncan, Apr 13, 2011

    robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    Images can't be inserted into views as subviews. UIImageViews, however, can. This is a significant difference.

    Are you wanting to check if a specific UIImageView is already added as a subview or if a UIImageView containing a specific image is already added?

    If it's the latter you will have to first explain how two images will be considered unique. For example:

    Code:
    UIImage *image1 = [UIImage imageNamed:@"MyImage.png"];
UIImage *image2 = [UIImage imageNamed:@"MyImage.png"];

if (image1 != image2)
{
NSLog(@"Different images");
}
    will log "Different images" despite both being created from the same image: it is up to you to write the code required to track which image came from which file (or which URL or whatever your image source is).
     
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  3. BarryK88, Apr 15, 2011

    BarryK88 thread starter macrumors member

    Joined:
    Mar 1, 2011
    #3
    this function did the job:

    Code:
    [scroller.subviews containsObject:image];
     
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