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// Code from: http://www.mlsite.net/blog/?p=232
// Modified to include a shadow
#import "UIButton+Glossy.h"
#import <QuartzCore/QuartzCore.h>
void UIButton_Glossy_touch()
{
// This is a trick to help categories link properly in static libraries
NSLog(@"Do nothing, just to make categories link correctly for static files.");
}
@implementation UIButton (Glossy)
- (void)makeGlossy
{
CALayer *thisLayer = self.layer;
// Add a border
thisLayer.cornerRadius = 8.0f;
thisLayer.masksToBounds = NO;
thisLayer.borderWidth = 2.0f;
thisLayer.borderColor = self.backgroundColor.CGColor;
// Give it a shadow
if ([thisLayer respondsToSelector:@selector(shadowOpacity)]) // For compatibility, check if shadow is supported
{
thisLayer.shadowOpacity = 0.7;
thisLayer.shadowColor = [[UIColor blackColor] CGColor];
thisLayer.shadowOffset = CGSizeMake(0.0, 3.0);
// TODO: Need to test these on iPad
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2)
{
thisLayer.rasterizationScale=2.0;
}
thisLayer.shouldRasterize = YES; // FYI: Shadows have a poor effect on performance
}
// Add backgorund color layer and make original background clear
CALayer *backgroundLayer = [CALayer layer];
backgroundLayer.cornerRadius = 8.0f;
backgroundLayer.masksToBounds = YES;
backgroundLayer.frame = thisLayer.bounds;
backgroundLayer.backgroundColor=self.backgroundColor.CGColor;
[thisLayer insertSublayer:backgroundLayer atIndex:0];
thisLayer.backgroundColor=[UIColor colorWithWhite:0.0f alpha:0.0f].CGColor;
// Add gloss to the background layer
CAGradientLayer *glossLayer = [CAGradientLayer layer];
glossLayer.frame = thisLayer.bounds;
glossLayer.colors = [NSArray arrayWithObjects:
(id)[UIColor colorWithWhite:1.0f alpha:0.4f].CGColor,
(id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
(id)[UIColor colorWithWhite:0.75f alpha:0.0f].CGColor,
(id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
nil];
glossLayer.locations = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0f],
[NSNumber numberWithFloat:0.5f],
[NSNumber numberWithFloat:0.5f],
[NSNumber numberWithFloat:1.0f],
nil];
[backgroundLayer addSublayer:glossLayer];
}
@end
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