How can I dim the view in an iPhone application?

Question

I've seen a lot of iPhone apps that will dim the screen with an activity indicator when it's updating or downloading something to let the user know it's busy. I know how to do the activity indicator but how do I go about doing the dimming? Please post example code if you can.

score 7 · Answer 1 · edited Jun 20 '20 at 09:12

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They don't actually dim it, Apple won't allow apps to adjust the screen brightness. They just put a black, semitransparent image over the screen, which has a similar effect.

Edit:

Jailbroken applications can adjust the screen brightness, and there is an API to do it, however Apple will not approve of any application that changes the screen brightness.

edited Jun 20 '20 at 09:12

Community

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answered May 27 '09 at 16:17

Malfist

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To clarify, you should use a separate, semitransparent black view rather than altering the drawing of the main view(s). This will be composited cheaply in the GPU. – Jens Ayton May 27 '09 at 18:12

score 2 · Accepted Answer · answered May 28 '09 at 14:52

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Ok, the way I did this was too create another view and set the opacity very low. Then I add this view as a subview.

answered May 28 '09 at 14:52

Xcoder

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How can I dim the view in an iPhone application?

2 Answers2

Edit:

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