原：为UIButton加入重叠背景图片

@implementation UIButton (ContextualAction)

- (void)setContextualActionStyle

{

    UIButton *button = self;

    CGRect oldFrame = button.frame;

    button.frame = CGRectMake(0.0f, 0.0f, 1000.0f, 1000.0f); // width and height must be bigger enough.

    CALayer *layer = button.layer;

    layer.cornerRadius = 5.0f;

    layer.masksToBounds = YES;

    layer.borderWidth = 1.0f;

    layer.borderColor = [UIColor lightGrayColor].CGColor;

    CALayer *shineLayer = [CALayer layer];

    shineLayer.frame = button.layer.bounds;

    UIImage *lightGrayBackgroundImage = [UIImage imageNamed:@"texture_light.png"];    

    shineLayer.backgroundColor =  [UIColor colorWithPatternImage:lightGrayBackgroundImage].CGColor;

    shineLayer.borderWidth = 2.0f; // 1.0f px will be cover by layer.border.

    shineLayer.borderColor = [UIColor whiteColor].CGColor;

    [button.layer addSublayer:shineLayer];

    button.titleLabel.textAlignment = UITextAlignmentCenter;

    button.titleLabel.font = [UIFont boldSystemFontOfSize:10];

    [button setTitleColor:[UIColor colorWithRed:102.0f/255.0f green:102.0f/255.0fblue:102.0f/255.0f alpha:1.0f] forState:UIControlStateNormal];

    [button setTitleShadowColor:[UIColor whiteColor] forState:UIControlStateNormal];

    button.titleLabel.shadowOffset = CGSizeMake(0.0f, 1.0f);

    [button bringSubviewToFront:button.titleLabel]; // must add. otherwise the title won't show.

    button.frame = oldFrame;

}

@end