UIView作为UIImageView的父级

Question

What I'm trying to achieve

nutshell:

use UIView as a container that will move it's "sub-views" when it is moved and also automagically set their visibility when it's visibility changes

long version:

I'd like to have multiple UIImageView within a UIView, whenever UIView is visible, all UIImageView are visible, when UIView is hidden, all UIImageView are hidden, when UIView changes position, all UIImageView will preserve position within their UIView parent.

Additional Info

I'm creating a UIView dynamically and also a few UIImageView which I was hoping that [UIView addSubview:UIImageViewInstance]; would take care of that, unfortunately, it doesn't.

I'm not using the interface builder!

Question

how can I achieve above said? If you believe that UIView is not the correct way to solve my problem, feel free to present other option(s).

Answer 1

If I understand your question correctly, using a UIView with UIImageView subviews is the right approach, IMO. What you said also should work fine - creating a UIView , adding UIImageView subviews, then moving the parent view and changing its visibility, etc.

I would recommend using something like this:

UIView *parent = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 300)];
[self.view addSubview:parent];

//Make a horizontal row of 5 images
for (int i = 0; i < 5; i++) {

    UIImageView *imgV = [[UIImageView alloc] initWithFrame:CGRectMake(i * 25, 0, 20, 20)];
    [imgV setImage:[UIImage imageNamed:@"yourimage.png"]];
    [parent addSubview:imgV];
}

//Then you should be able to do things like this and it will apply to the subviews as well
[parent setCenter:self.view.center];
[parent setAlpha:0.8];
//Etc

Answer 2

Well, the approach that you are taking is just fine. I'll just write down the code for your reference. I am assuming that you are working with an instance of UIViewController and you are adding subviews to it.

UIView *parentView = [[UIView alloc]initWithFrame:
                                   CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height)];
UIImageView *childImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,50,50)];
[parentView addSubview:childImageView];

This should take care of your issue.