Drawing Shadowed Rectangle at iOS - iphone

Question

I am trying to draw an image like below with libraries in iOS; but i couldn't.
I think it is very easy to draw but i couldn't achieve.
After i accomplish to draw i will place a label over it.

Answer 1

Use this as your drawRect method:
- (void)drawRect:(CGRect)rect
//// General Declarations
CGContextRef context = UIGraphicsGetCurrentContext();
//// Shadow Declarations
UIColor* shadow = [UIColor blackColor];
CGSize shadowOffset = CGSizeMake(1, 1);
CGFloat shadowBlurRadius = 2;
//// Frames
CGRect frame = rect;
//// Abstracted Graphic Attributes
CGRect shadowBoxRect = CGRectMake(CGRectGetMinX(frame) + 0, CGRectGetMinY(frame) + 0, 40, 40);
CGFloat shadowBoxCornerRadius = 4;
//// ShadowBox Drawing
UIBezierPath* shadowBoxPath = [UIBezierPath bezierPathWithRoundedRect: shadowBoxRect cornerRadius: shadowBoxCornerRadius];
[[UIColor lightGrayColor] setFill];
[shadowBoxPath fill];
////// ShadowBox Inner Shadow
CGRect shadowBoxBorderRect = CGRectInset([shadowBoxPath bounds], -shadowBlurRadius, -shadowBlurRadius);
shadowBoxBorderRect = CGRectOffset(shadowBoxBorderRect, -shadowOffset.width, -shadowOffset.height);
shadowBoxBorderRect = CGRectInset(CGRectUnion(shadowBoxBorderRect, [shadowBoxPath bounds]), -1, -1);
UIBezierPath* shadowBoxNegativePath = [UIBezierPath bezierPathWithRect: shadowBoxBorderRect];
[shadowBoxNegativePath appendPath: shadowBoxPath];
shadowBoxNegativePath.usesEvenOddFillRule = YES;
CGContextSaveGState(context);
{
CGFloat xOffset = shadowOffset.width + round(shadowBoxBorderRect.size.width);
CGFloat yOffset = shadowOffset.height;
CGContextSetShadowWithColor(context,
CGSizeMake(xOffset + copysign(0.1, xOffset), yOffset + copysign(0.1, yOffset)),
shadowBlurRadius,
shadow.CGColor);
[shadowBoxPath addClip];
CGAffineTransform transform = CGAffineTransformMakeTranslation(-round(shadowBoxBorderRect.size.width), 0);
[shadowBoxNegativePath applyTransform: transform];
[[UIColor grayColor] setFill];
[shadowBoxNegativePath fill];
}
CGContextRestoreGState(context);
}

Answer 2

Inner shadows are hard to do with CoreGraphics -- basically, you need to negate your path and draw a drop shadow below it, clipped to your original path.
You can take a look at PaintCode and it will show you the code. It has a 15-min demo mode if you don't want to purchase it, that should be enough for your needs.

Answer 3

You could try this:
#import <QuartzCore/QuartzCore.h>
and in your code , after making the your view set these:
self.layer.cornerRadius = x;
self.layer.masksToBounds = TRUE;
This allows you to have rounded corners on your view. And if you calculate the radius to match your view , you should get the desired look.
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor grayColor];
}
return self;
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context =UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
// And draw with a blue fill color
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
// Draw them with a 2.0 stroke width so they are a bit more visible.
CGContextSetLineWidth(context, 2.0);
CGContextAddRect(context, self.bounds);
CGContextStrokePath(context);
// Close the path
CGContextClosePath(context);
// Fill & stroke the path
CGContextDrawPath(context, kCGPathFillStroke);
self.layer.cornerRadius = self.bounds.size.width/12;
self.layer.masksToBounds = TRUE;
}
I think it will be helpful to you.

Answer 4

Try the below code where myView is the UIView to which you want to set the shadow.
myView.layer.cornerRadius = 5.0f;
myView.layer.masksToBounds = YES;
[myView.layer setShadowColor:[[UIColor blackColor] colorWithAlphaComponent: 0.5]];
[myView.layer setShadowOffset:CGSizeMake(0, -1)];
Hope this helps.-