iphone sdk transparent subview background
Solution 1
Try:
view.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.0];
view.opaque = NO;
Solution 2
Is the view being loaded from a nib file? If so, the -initWithFrame:
won't be called; -initWithCoder:
will be called instead. A better place to do this initialization might be in -viewDidLoad
. But setting the background color to [UIColor clearColor]
should definitely do the trick.
Solution 3
Try coloring the subview's background with a 0.0 for Alpha. That should make it completely transparent.
Something like this:
UIColor *myUIColor = [UIColor colorWithRed: 1.0 green: 1.0 blue: 1.0 alpha:0.0];
Solution 4
In the function
- (void)drawRect:(CGRect)rect
try to update
CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
to
const CGFloat BACKGROUND_OPACITY = 0.85; //Note: update this value to what you need
CGContextSetRGBFillColor(context, 1, 1, 1, BACKGROUND_OPACITY); // You can change 1,1,1 to the needed values
This link might help you http://www.cocoawithlove.com/2009/04/showing-message-over-iphone-keyboard.html
Comments
-
Catalin almost 2 years
I have a main view with a picture on it.
I am trying to add a subview with
[self.view addSubview:view2];
but I want the view2 background to be transparent. Have tried opaque=no and background color to clearcolor and also tried to subclass a uiview and rewrite the drawrect with:#import "TransparentView.h" @implementation TransparentView - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { [self setBackgroundColor:[UIColor clearColor]]; self.opaque=NO; self.clearsContextBeforeDrawing=YES; } return self; } - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextClearRect(context, rect); CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor); CGContextFillRect(context, rect); } @end
But still doesn't display the background of the subview transparent... any ideas?