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【ObjC】亮灯效果
作者:昶福 / 发布于2014/11/7/ 560

	#import <UIKit/UIKit.h>
	#import <QuartzCore/QuartzCore.h>
	#import <QuartzCore/CAAnimation.h>
	
	@interface UIView (ZKPulseView)
	
	/*
	* To remove all pulse effect if you have any.
	*
	*/
	-(void) stopPulseEffect;
	
	/*
	* Start to pulse by using default color, which is the background color's reversed color
	*
	*/
	-(void) startPulse;
	
	/*
	* Start to pulse by providing needed pulse color.
	*
	*/
	-(void) startPulseWithColor:(UIColor *)color;
	
	/*
	* The must underneeth method to create the pulse effect, you can use that for your own purposes
	*
	*/
	-(void) startPulseWithColor:(UIColor *)color offset:(CGSize) offset frequency:(CGFloat) freq;
	
	@end
	
	
	#import "UIView+ZKPulseView.h"
	
	@implementation UIView (ZKPulseView)
	
	-(void)stopPulseEffect{
	 [self.layer removeAnimationForKey:@"ZKPulse"];
	 self.layer.shadowOpacity = 0.0;
	}
	
	-(void)startPulse{
	 //Start to pulse use the default reversed color
	 [self startPulseWithColor:[self reversedColor]];
	}
	
	-(void)startPulseWithColor:(UIColor *)color{
	 //Shadow radius can enable to pulse part to just be the view itself, if you dont like to have dropdown effect
	 //You can set value for this key.
	 self.layer.shadowRadius = 14;
	 [self startPulseWithColor:color offset:CGSizeMake(0.0, 0.0) frequency:2];
	}
	
	-(void) startPulseWithColor:(UIColor *)color offset:(CGSize)offset frequency:(CGFloat)freq{
	 self.layer.shadowColor = color.CGColor;
	 self.layer.shadowOffset = offset;
	 self.layer.shadowOpacity = 0.9;
	 self.layer.masksToBounds = NO;
	
	 //Animation part
	 CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
	 anim.fromValue = @(0.9);
	 anim.toValue = @(0.2);
	 anim.duration = freq;
	 anim.autoreverses = YES;
	 anim.repeatCount = INT32_MAX;
	
	 [self.layer addAnimation:anim forKey:@"ZKPulse"];
	}
	
	/*
	* Private method to generate reversed color from this view's background color
	*
	*/
	-(UIColor *) reversedColor{
	 const CGFloat *componentColors = CGColorGetComponents(self.backgroundColor.CGColor);
	 UIColor *newColor = [[UIColor alloc] initWithRed:(1.0 - componentColors[0])
	 green:(1.0 - componentColors[1])
	 blue:(1.0 - componentColors[2])
	 alpha:componentColors[3]];
	 return newColor;
	}
	
	
	@end
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