1 -(void)drawRect:(CGRect)rect
2 {
3 [[UIColor clearColor]setFill];
4 UIRectFill(rect);
5 NSInteger pulsingCount = 3;
6 double animationDuration = 2;
7
8 CALayer * animationLayer = [[CALayer alloc]init];
9 self.animationLayer = animationLayer;
10
11 for (int i = 0; i < pulsingCount; i++) {
12 CALayer * pulsingLayer = [[CALayer alloc]init];
13 pulsingLayer.frame = CGRectMake(0, 0, rect.size.width, rect.size.height);
14 pulsingLayer.backgroundColor = [UIColor colorWithRed:92.0/255.0 green:181.0/255.0 blue:217.0/255.0 alpha:1.0].CGColor;
15 pulsingLayer.borderColor = [UIColor colorWithRed:92.0/255.0 green:181.0/255.0 blue:217.0/255.0 alpha:1.0].CGColor;
16 pulsingLayer.borderWidth = 1.0;
17 pulsingLayer.cornerRadius = rect.size.height/2;
18
19 CAMediaTimingFunction * defaultCurve = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
20
21 CAAnimationGroup * animationGroup = [[CAAnimationGroup alloc]init];
22 animationGroup.fillMode = kCAFillModeBoth;
23 animationGroup.beginTime = CACurrentMediaTime() + (double)i * animationDuration/(double)pulsingCount;
24 animationGroup.duration = animationDuration; animationGroup.repeatCount = HUGE_VAL;
25 animationGroup.timingFunction = defaultCurve;
26
27 CABasicAnimation * scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
28 scaleAnimation.autoreverses = NO;
29 scaleAnimation.fromValue = [NSNumber numberWithDouble:0.2];
30 scaleAnimation.toValue = [NSNumber numberWithDouble:1.0];
31
32 CAKeyframeAnimation * opacityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];
33 opacityAnimation.values = @[[NSNumber numberWithDouble:1.0],[NSNumber numberWithDouble:0.5],[NSNumber numberWithDouble:0.3],[NSNumber numberWithDouble:0.0]];
34 opacityAnimation.keyTimes = @[[NSNumber numberWithDouble:0.0],[NSNumber numberWithDouble:0.25],[NSNumber numberWithDouble:0.5],[NSNumber numberWithDouble:1.0]];
35 animationGroup.animations = @[scaleAnimation,opacityAnimation];
36
37 [pulsingLayer addAnimation:animationGroup forKey:@"pulsing"];
38 [animationLayer addSublayer:pulsingLayer];
39 }
40 self.animationLayer.zPosition = -1;//重新加载时，使动画至底层
41 [self.layer addSublayer:self.animationLayer];
42
43 CALayer * thumbnailLayer = [[CALayer alloc]init];
44 thumbnailLayer.backgroundColor = [UIColor whiteColor].CGColor;
45 CGRect thumbnailRect = CGRectMake(0, 0, 46, 46);
46 thumbnailRect.origin.x = (rect.size.width - thumbnailRect.size.width)/2.0;
47 thumbnailRect.origin.y = (rect.size.height - thumbnailRect.size.height)/2.0;
48 thumbnailLayer.frame = thumbnailRect;
49 thumbnailLayer.cornerRadius = 23.0;
50 thumbnailLayer.borderWidth = 1.0;
51 thumbnailLayer.masksToBounds = YES;
52 thumbnailLayer.borderColor = [UIColor whiteColor].CGColor;
53 UIImage * thumbnail = self.thumbnailImage;
54 thumbnailLayer.contents = (id)thumbnail.CGImage;
55 thumbnailLayer.zPosition = -1;
56 [self.layer addSublayer:thumbnailLayer];
57 }
