How to add Drop Shadow in iOS UIButton?

Question

Help of experts is needed

I am making UIButton custom, where I am cropping of background and showing on UIButton as below.

[self setBackgroundImage:[self getSingleColorImageForLinear:self.frame] forState:UIControlStateSelected];




 //Method to make take image
-(UIImage *)getSingleColorImageForLinear:(CGRect)frame{


    CGSize size = CGSizeMake(frame.size.width,frame.size.height);
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();

    size_t gradientNumberOfLocations = 1;
    CGFloat gradientLocations[1] = { 0.0 };
    CGFloat gradientComponents[4] = { 0, 0, 0, 0.3, };

    CGGradientRef gradient = CGGradientCreateWithColorComponents (colorspace, gradientComponents, gradientLocations, gradientNumberOfLocations);

    CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(0, size.height), 0);


    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    CGGradientRelease(gradient);
    CGColorSpaceRelease(colorspace);
    UIGraphicsEndImageContext();

    return image;

}

Now I want to apply, the property of Drop Shadow, seen in Adobe Photoshop to this Image,

How can I do so using Core Graphics or any Core Foundation of iOS Library?

Drop Shadow of Adobe looks as below

Thanks

Any image Layer has Drop shadow, you can see many images which contains drop shadow at particular angle. — Sam Shaikh, Sep 01 '15 at 11:12

Igor · Accepted Answer · 2015-09-01T11:19:56.000

5

button.layer.shadowColor = [UIColor blackColor].CGColor;
button.layer.shadowOffset = CGSizeMake(5, 5);
button.layer.shadowRadius = 5;
button.layer.shadowOpacity = 0.5;

edited Sep 01 '15 at 11:19

answered Sep 01 '15 at 11:13

Igor

1,537
10
12

I think you must check adobe, we pass an angle where shadow will fall. No accepted answer. – Sam Shaikh Sep 01 '15 at 11:43
why not, you can draw shadow with any offset changing shadowOffset? – Igor Sep 01 '15 at 11:51
ShadowOffset is not angle to shadow but its where it will be placed. after creating a shadow, but in Adobe angle, it can be on half too, not all sides, – Sam Shaikh Sep 01 '15 at 12:13
one thing more, this shadow will create a shadow of Label Text, I want a shadow on UIImage, which is at background. Clear? – Sam Shaikh Sep 01 '15 at 12:19
than you can add shadow to the UIImage directly, like here http://stackoverflow.com/questions/2936443/create-new-uiimage-by-adding-shadow-to-existing-uiimage – Igor Sep 01 '15 at 12:29
I can better google. Here are many issues, well, I am sorry, can't accept your answer. – Sam Shaikh Sep 01 '15 at 12:35
Yes, it's many issues, including custom drawing, or you can find UIImageView in button.subviews and draw shadow, using imageView.layer. And some others. Maybe you should concretize accepting criterias in your question? – Igor Sep 01 '15 at 12:39

How to add Drop Shadow in iOS UIButton?

1 Answers1