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drawRect depends on Views -> On Startup Custom View uses wrong frames


drawRect depends on Views -> On Startup Custom View uses wrong frames

By : Stole
Date : November 17 2020, 11:58 AM
I think the issue was by ths following , Your approach is a violation of the principle tell, don't ask. You should be telling your view where to draw; it shouldn't be asking.
Inside CustomView:
code :


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An array of views (views that have an UIImage and 3 buttons): Is a custom view/drawRect needed?

An array of views (views that have an UIImage and 3 buttons): Is a custom view/drawRect needed?


By : Sascha
Date : March 29 2020, 07:55 AM
To fix this issue It doesn't look like you need a custom view to override drawRect: since you are looking to build a collection view using a single image view and three buttons. However it will not hurt to create one so that accessing the sub views can be done via named properties. For example, customObject.imageView and customObject.firstButton. As a unit it makes sense to create one as it will be messy to keep track of all the image views and buttons you would end up adding to the scroll view otherwise.
drawRect and addSubview: custom drawing affects which views?

drawRect and addSubview: custom drawing affects which views?


By : gbdev
Date : March 29 2020, 07:55 AM
should help you out drawRect is meant to be only for drawing your content in the view.
Whether it draws the entire view or part of it: It depends on your implementation. If you want to do any optimization is a good idea to check when your view calls drawRect and adjust the code accordingly (maybe you want to update only one part of the view, maybe you don't want to draw all the times, etc). It depends on your needs
code :
[myView addSubview:aSubview];
[myView setNeedsDisplay];
//or calculate the needed display rect by yourself and then
[myView setNeedsDisplayInRect:aRect];
iPhone UITableViewCell performance adding multiple Views vs one View with drawRect

iPhone UITableViewCell performance adding multiple Views vs one View with drawRect


By : user3615130
Date : March 29 2020, 07:55 AM
To fix the issue you can do Start with the first method of using separate UILabel's and UIImageView's. Test on actual devices and optimize if you see performance problems.
Depending on the content I've had option 1 be faster than drawing everything in one view. Especially when that view had to draw images. UIImageView's are heavily optimized by apple.
What did I do wrong in my custom view to cause it to not be rendered in my expandable list view (other views render fine

What did I do wrong in my custom view to cause it to not be rendered in my expandable list view (other views render fine


By : user1417728
Date : March 29 2020, 07:55 AM
I wish this helpful for you You need to define your custom view as mentioned below.Add your other codes to this view. I am keep it simple so that it will be easier for you to understand.
code :
public class CustomView extends ConstraintLayout {
        public CustomView(Context context) {
            super(context);
            init();
        }

        public CustomView(Context context, AttributeSet attrs) {
            super(context, attrs);
            init();
        }

        public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            init();
        }

        void init() {
            inflate(getContext(), R.layout. service_selection_checkbox_layout, this);
        }
    }
NSScrollView calls drawRect on custom views for every frame

NSScrollView calls drawRect on custom views for every frame


By : mojca
Date : March 29 2020, 07:55 AM
Hope this helps I figured out a way to make it draw everything only once! I am now using an NSImage to draw everything on once. I only do this again when the model changes.
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