change the uiview background color with code

Question

I would like to change the background color of my app programmatically, not IB. Is it possible to get both a Swift and Obj-C answer.

score 65 · Accepted Answer · edited Mar 27 '19 at 07:52

65

You can set the backgroundColor property of whatever view it is you have on screen.

In Objective-C:

self.view.backgroundColor = [UIColor redColor];

In Swift:

self.view.backgroundColor = .red

or if it's the main window you're after,

In Objective-C:

self.window.backgroundColor = [UIColor redColor];

In Swift:

self.window.backgroundColor = .red

edited Mar 27 '19 at 07:52

Cœur

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answered Apr 02 '11 at 18:34

Jamie

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score 7 · Answer 2 · edited Apr 17 '15 at 12:19

7

self.view.backgroundColor = [UIColor redColor];

possible colors are :

blackColor  
 darkGrayColor  
 lightGrayColor  
 whiteColor  


 grayColor  
 redColor  
 greenColor  
 blueColor  
 cyanColor  
 yellowColor  
 magentaColor  
 orangeColor  
 purpleColor  
 brownColor  
 clearColor

edited Apr 17 '15 at 12:19

itsji10dra

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answered Feb 06 '14 at 22:40

user2165491

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For reference, the list of color can be currently found at https://developer.apple.com/documentation/uikit/uicolor/1621945-clearcolor?language=objc – Cœur Mar 27 '19 at 07:58

score 6 · Answer 3 · answered Dec 01 '16 at 23:51

6

For Swift 3, you should do:

self.view.backgroundColor = UIColor.white

Unfortunately, the other answers no longer work in Swift 3.

answered Dec 01 '16 at 23:51

Semih Sezer

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score 3 · Answer 4 · answered Apr 17 '15 at 12:01

3

If you want to change the background color of the view with code in Swift, you should do instead:

self.view.backgroundColor = UIColor.redColor();

answered Apr 17 '15 at 12:01

Gustavo Chavez

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self is not necessary unless in a clousre – fujianjin6471 Apr 17 '15 at 12:05

score 1 · Answer 5 · edited Mar 27 '19 at 07:54

1

You can use RGB Color by following code:

UIColor *myColor = [UIColor colorWithRed:(128.0 / 255.0) green:(90.0 / 255.0) 
blue:(200.0 / 255.0) alpha: 1];
self.view.backgroundcolor = mycolor;

edited Mar 27 '19 at 07:54

Cœur

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answered May 03 '17 at 03:58

Vikas Rajput

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Welcome to stack overflow :-) Please look at [answer]. You should provide some information why your code solves the problem. Code-only answers aren't useful for the community. – JimHawkins May 03 '17 at 09:35
Disagree with @JimHawkins - the problem with SO is not imperfect contribs like the above (which nevertheless have _some_ merit), it's dishearteningly critical comments, often of newbies. – Colin Stark Nov 11 '19 at 02:09
@ColinStark - there is at least one good reason for code-only answers: the users english is too bad, but the code is helpful as it is. But code-only answers should not be a default on SO . See also https://meta.stackoverflow.com/q/345719/1988304 . I don't see why my comment should be "dishearteningly" – JimHawkins Nov 11 '19 at 16:12
First you said "code-only answers aren't useful", then said "the code is helpful as it is... should not be the default". Which is it? As for disheartening: well, if a newbie is trying her/his best, makes a contribution that's non-null, and immediately gets a negative "this isn't useful" aka "worthless", they may be discouraged. This has occasionally been my experience. It's also the reputation that SO has acquired. – Colin Stark Nov 14 '19 at 07:30

score 1 · Answer 6 · answered Jan 21 '19 at 05:37

For swift based project you can simply type the following and press enter:

self.view.backgroundColor = Color Literal

Here the ColorLiteral property will give you a default white colour which you can change by double clicking on that colour.

You can choose from a list of colour from this popup:

change the uiview background color with code

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