Swift UIView background color opacity

Question

I have a UIView with a UILabel in it  I want the UIView to have white background color  but with an opacity of 50   The problem whith setting view alpha   0 5 is that the label will have an opacity of 50  as well  so I figured out that it maybe would be possible to have a UIView with white background color and opacity  white view   and then have another UIView with the label  label view   Then add the  white view  to  label view  by doing this  label view addSubview white view   This apparently doesn t work  I d like to do like  label view backgroundView white view  but you can t set a background view on a UIView like you can do in a UICollectionView for instance   Does anyone have any clue of how to solve this   EDIT Because several answers are approx the same I ll type it here  Now I ve tried even these   label view1 backgroundColor   UIColor whiteColor   colorWithAlphaComponent 0 5  label view1 addSubview firstPlacelbl  endGameView addSubview label view1    and  label view1 backgroundColor   UIColor white  1  alpha  0 5  label view1 addSubview firstPlacelbl  endGameView addSubview label view1    And still the label is also affected by the alpha  and it gets an opacity of 50   I don t get it what I do wrong because I only set the colors alpha to 0 5 and not the labels  Any ideas

User · Accepted Answer

You can set background color of view to the UIColor with alpha, and not affect view.alpha:

view.backgroundColor = UIColor(white: 1, alpha: 0.5)

or

view.backgroundColor = UIColor.red.withAlphaComponent(0.5)

User · Answer

The problem you have found is that view is different from your UIView   view  refers to the entire view  For example your home screen is a view   You need to clearly separate the entire  view  your  UIView  and your  UILabel   You can accomplish this by going to your storyboard  clicking on the item  Identity Inspector  and changing the Restoration ID   Now to access each item in your code using the restoration ID

User · Answer

It s Simple in Swift   just put this color  in your background view color and it will work   let dimAlphaRedColor    UIColor redColor   colorWithAlphaComponent 0 7  yourView backGroundColor    dimAlphaRedColor

User · Answer

You can also set it from InterfaceBuilder by changing color s opacity

User · Answer

Setting alpha property of a view affects its subviews  If you want just transparent background set view s backgroundColor proprty to a color that has alpha component smaller than 1    view backgroundColor   UIColor white withAlphaComponent 0 5

User · Answer

in Swift 3 0  yourView backgroundColor   UIColor black withAlphaComponent 0 5   This works for me in xcode 8 2    It may helps you

User · Answer

The question is old  but it seems that there are people who have the same concerns  What do you think of the opinion that  the alpha property of UIColor and the opacity property of Interface Builder are applied differently in code    The two views created in Interface Builder were initially different colors  but had to be the same color when the conditions changed  So  I had to set the background color of one view in code  and set a different value to make the background color of both views the same  As an actual example  the background color of Interface Builder was 0x121212 and the Opacity value was 80  in Amani Elsaed s image    Red  18  Green  18  Blue  18  Hex Color     121212   Opacity  80   In the code  I set the other view a background color of 0x121212 with an alpha value of 0 8  self myFuncView backgroundColor   UIColor red  18  green  18  blue  18  alpha  0 8   extension is extension UIColor       convenience init red  Int  green  Int  blue  Int  alpha  CGFloat   1 0            self init red  CGFloat red    255 0                    green  CGFloat green    255 0                    blue  CGFloat blue    255 0                    alpha  alpha           However  the actual view was   View with background color specified in Interface Builder   R 0 09 G 0 09 B 0 09 alpha 0 8   View with background color by code   R 0 07 G 0 07 B 0 07 alpha 0 8  Calculating it   0x12   18 decimal  18 255   0 07058    255   0 09   22 95 23 decimal    0x17  So  I was able to match the colors similarly by setting the UIColor values   to 17  17  17 and alpha 0 8  self myFuncView backgroundColor   UIColor red  17  green  17  blue  17  alpha  0 8   Or can anyone tell me what I m missing

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