CODEWITHSUNDEEP
iosobjective-cbackgroundlinedrawrect
DrDisc
DrDisc

Reputation: 281

iOS - CGContextStrokePath/CGContextDrawPath remove black background color

I'm trying to draw a straight dashed line. I've gotten it so it draws the dashes, but this black background color remains. I've seem many answers to other questions, but none of them worked.

Apple's documentation seems to point to the fill color and using either CGContextFillPath or CGContextDrawPath, but neither of those work and the background of the dashed line is still black.

- (void)drawRect:(CGRect)rect {
    CGContextRef contextRef = UIGraphicsGetCurrentContext();

    GLFloat lines[] = {self.frame.size.width, self.frame.size.width*2};

    CGFloat grey[4] = {0.6f, 0.6f, 0.6f, 1.0f};
    CGContextSetStrokeColor(contextRef, grey);
    CGContextSetFillColorWithColor(contextRef, [[UIColor clearColor] CGColor]);

    CGContextSetLineDash(contextRef, 0, lines, 2);
    CGContextSetLineWidth(contextRef, self.frame.size.width);

    CGContextBeginPath(contextRef);
    CGContextMoveToPoint(contextRef, 0, 0);
    CGContextAddLineToPoint(contextRef, 0, self.frame.size.height);

    CGContextDrawPath(contextRef, kCGPathFillStroke);
}

Upvotes: 3

Views: 2280

Answers (1)

Rob
Rob

Reputation: 437532

When manually adding this view to your view hierarchy, you just have to make sure you're setting the background color. For example, if you're initializing your view with initWithFrame, then set the background color in that method:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setBackgroundColor:[UIColor clearColor]];
    }
    return self;
}

Or, alternatively, when adding the view, set the background color there:

CustomView *customView = [[CustomView alloc] initWithFrame:frame];
customView.backgroundColor = [UIColor clearColor];
[self.view addSubview:customView];

Upvotes: 1

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