////  UIView+GlowView.h//  YouXianClock////  Created by YouXianMing on 14-12-21.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@interface UIView (GlowView)@property (nonatomic, strong) NSNumber *GCDTimerInterval; // 定时器的时间间隔，给float值@property (nonatomic, strong) NSNumber *glowDuration;     // layer动画的时间长度，给float值@property (nonatomic, strong) NSNumber *glowLayerOpacity; // 设置glowLayer的动画透明度的程度，给float值，范围在[0,1]- (void)createGlowLayerWithColor:(UIColor *)color glowRadius:(CGFloat)radius;- (void)startGlow;- (void)glowToGlowLayerOnce;- (void)glowToNormalLayerOnce;@end

////  UIView+GlowView.m//  YouXianClock////  Created by YouXianMing on 14-12-21.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "UIView+GlowView.h"#import <objc/runtime.h>#define GLOWVIEW_LAYER_FLAG     @"UIView+GlowView"@interface UIView ()@property (strong, nonatomic) dispatch_source_t  dispatchSource;@property (strong, nonatomic) NSNumber          *glowViewShowFlag;@end@implementation UIView (GlowView)#pragma mark - 动态添加了属性static char dispatchSourceTimerFlag;- (void)setDispatchSource:(dispatch_source_t)dispatchSource {    objc_setAssociatedObject(self, &dispatchSourceTimerFlag, dispatchSource, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (dispatch_source_t)dispatchSource {    return objc_getAssociatedObject(self, &dispatchSourceTimerFlag);}static char charGlowViewShowFlag;- (void)setGlowViewShowFlag:(NSNumber *)glowViewShowFlag {    objc_setAssociatedObject(self, &charGlowViewShowFlag, glowViewShowFlag, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)glowViewShowFlag {    return objc_getAssociatedObject(self, &charGlowViewShowFlag);}static char GCDTimerIntervalFlag;- (void)setGCDTimerInterval:(NSNumber *)GCDTimerInterval {    objc_setAssociatedObject(self, &GCDTimerIntervalFlag, GCDTimerInterval, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)GCDTimerInterval {    return objc_getAssociatedObject(self, &GCDTimerIntervalFlag);}static char glowLayerOpacityFlag;- (void)setGlowLayerOpacity:(NSNumber *)glowLayerOpacity {    objc_setAssociatedObject(self, &glowLayerOpacityFlag, glowLayerOpacity, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)glowLayerOpacity {    return objc_getAssociatedObject(self, &glowLayerOpacityFlag);}static char glowDurationFlag;- (void)setGlowDuration:(NSNumber *)glowDuration {    objc_setAssociatedObject(self, &glowDurationFlag, glowDuration, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)glowDuration {    return objc_getAssociatedObject(self, &glowDurationFlag);}#pragma mark - 方法- (void)createGlowLayerWithColor:(UIColor *)color glowRadius:(CGFloat)radius {    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, [UIScreen mainScreen].scale);    [self.layer renderInContext:UIGraphicsGetCurrentContext()];    UIBezierPath* path =     [UIBezierPath bezierPathWithRect:(CGRect){CGPointZero, CGSizeMake(self.bounds.size.width, self.bounds.size.height)}];    [color setFill];    [path fillWithBlendMode:kCGBlendModeSourceAtop alpha:1.0];        CALayer *glowLayer      = [CALayer layer];    glowLayer.name          = GLOWVIEW_LAYER_FLAG;    glowLayer.frame         = self.bounds;    glowLayer.contents      = (__bridge id)UIGraphicsGetImageFromCurrentImageContext().CGImage;    glowLayer.shadowOpacity = 1.0f;    glowLayer.shadowOffset  = CGSizeMake(0, 0);    glowLayer.shadowColor   = (color == nil ? [UIColor redColor].CGColor : color.CGColor);    glowLayer.shadowRadius  = (radius > 0 ? radius : 2.f);    glowLayer.opacity       = 0.f; // 开始时候的透明度为0    [self.layer addSublayer:glowLayer];    UIGraphicsEndImageContext();}- (void)startGlow {    [self.layer.sublayers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        CALayer *layer = obj;                // 找到了layer才进行下面的操作        if ([layer.name isEqualToString:GLOWVIEW_LAYER_FLAG]) {                        if (self.glowViewShowFlag == nil) {                self.glowViewShowFlag = [NSNumber numberWithBool:NO];            }                        if (self.dispatchSource == nil) {                self.dispatchSource =                 dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_main_queue());                dispatch_source_set_timer(self.dispatchSource, dispatch_time(DISPATCH_TIME_NOW, 0),                                          NSEC_PER_SEC * (self.GCDTimerInterval == nil ? 1 : self.GCDTimerInterval.floatValue), 0);                dispatch_source_set_event_handler(self.dispatchSource, ^{                    if (self.glowViewShowFlag.boolValue =http://www.mamicode.com/= NO) {                        self.glowViewShowFlag = @(YES);                                                // 做动画，从透明到显示出来                        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];                                                if (self.glowLayerOpacity != nil) {                            animation.fromValue = @(0.f);                            animation.toValue   = [NSNumber numberWithFloat:self.glowLayerOpacity.floatValue];                            layer.opacity       = self.glowLayerOpacity.floatValue;                        } else {                            animation.fromValue = @(0.f);                            animation.toValue   = @(0.8f);                            layer.opacity       = 0.8;                        }                                                if (self.glowDuration != nil) {                            animation.duration = self.glowDuration.floatValue;                        } else {                            animation.duration = 0.8;                        }                                                [layer addAnimation:animation forKey:nil];                    } else {                        self.glowViewShowFlag = @(NO);                                                // 做动画                        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];                        animation.fromValue         = [NSNumber numberWithFloat:layer.opacity];                        animation.toValue           = @(0.f);                                                if (self.glowDuration != nil) {                            animation.duration = self.glowDuration.floatValue;                            layer.opacity      = 0.f;                        } else {                            animation.duration = 0.8;                            layer.opacity      = 0.f;                        }                                                [layer addAnimation:animation forKey:nil];                    }                });                                dispatch_resume(self.dispatchSource);            }        }    }];}- (void)glowToGlowLayerOnce {    [self.layer.sublayers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        CALayer *layer = obj;                // 找到了layer才进行下面的操作        if ([layer.name isEqualToString:GLOWVIEW_LAYER_FLAG]) {                // 做动画，从透明到显示出来                CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];                if (self.glowLayerOpacity != nil) {                    animation.fromValue = @(0.f);                    animation.toValue   = [NSNumber numberWithFloat:self.glowLayerOpacity.floatValue];                    layer.opacity       = self.glowLayerOpacity.floatValue;                } else {                    animation.fromValue = @(0.f);                    animation.toValue   = @(0.8f);                    layer.opacity       = 0.8;                }                                if (self.glowDuration != nil) {                    animation.duration = self.glowDuration.floatValue;                } else {                    animation.duration = 0.8;                }                [layer addAnimation:animation forKey:nil];        }    }];}- (void)glowToNormalLayerOnce {    [self.layer.sublayers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        CALayer *layer = obj;                // 做动画        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];        animation.fromValue         = [NSNumber numberWithFloat:layer.opacity];        animation.toValue           = @(0.f);                if (self.glowDuration != nil) {            animation.duration = self.glowDuration.floatValue;            layer.opacity      = 0.f;        } else {            animation.duration = 0.8;            layer.opacity      = 0.f;        }                [layer addAnimation:animation forKey:nil];    }];}@end

////  ViewController.m//  Glow////  Created by YouXianMing on 14/12/21.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "UIView+GlowView.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];     self.view.backgroundColor = [UIColor blackColor];        // 普通label    UILabel *label      = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];    label.center        = self.view.center;    label.font          = [UIFont fontWithName:@"HelveticaNeue-UltraLight" size:50.f];    label.textAlignment = NSTextAlignmentCenter;    label.text          = @"YouXianMing";    label.textColor     = [UIColor redColor];            label.GCDTimerInterval = @(2.f);    label.glowDuration     = @(1.f);    label.glowLayerOpacity = @(0.8f);    [label createGlowLayerWithColor:[UIColor yellowColor] glowRadius:4.f];    [label startGlow];        [self.view addSubview:label];    }@end