复制层示例2(粒子效果)

Posted on 2016-07-12 19:18  柠檬片  阅读(73)  评论(0)    收藏  举报 
  1 #import "VCView.h"
  2 
  3 @interface VCView()
  4 
  5 
  6 @property(nonatomic,strong) UIBezierPath *path;
  7 
  8 @property(nonatomic,weak) CALayer *dotLayer ;
  9 
 10 @end
 11 
 12 
 13 @implementation VCView
 14 
 15 
 16 +(nonnull Class)layerClass{
 17 
 18     return [CAReplicatorLayer  class];
 19 }
 20 
 21 
 22 
 23 -(void)awakeFromNib{
 24 
 25     //添加手势
 26     UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
 27     
 28     [self addGestureRecognizer:pan];
 29     
 30     
 31     //创建路径
 32     UIBezierPath *path = [UIBezierPath bezierPath];
 33 
 34     self.path = path;
 35 
 36     
 37     
 38     //创建粒子
 39     CALayer *dotLayer = [CALayer layer];
 40     dotLayer.frame = CGRectMake(-10, 0, 10, 10);
 41     dotLayer.backgroundColor = [UIColor redColor].CGColor;
 42     self.dotLayer = dotLayer;
 43     [self.layer addSublayer:dotLayer];
 44     
 45     
 46     
 47     CAReplicatorLayer *repL =  (CAReplicatorLayer *)self.layer;
 48     repL.instanceCount = 30;
 49     repL.instanceDelay = 0.25;
 50 
 51     
 52 
 53 
 54 }
 55 
 56 //开始
 57 - (void)start{
 58 
 59     //添加动画.
 60     CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
 61     anim.keyPath = @"position";
 62     anim.path = self.path.CGPath;
 63     anim.repeatCount = MAXFLOAT;
 64     anim.duration = 4;
 65     [self.dotLayer addAnimation:anim forKey:nil];
 66     
 67 }
 68 
 69 //重绘
 70 - (void)reDraw{
 71 
 72     //把路径清空
 73     [self.path removeAllPoints];
 74     [self setNeedsDisplay];
 75     
 76     //移除动画
 77     [self.dotLayer removeAllAnimations];
 78     
 79     
 80     
 81 
 82 }
 83 
 84 
 85 
 86 
 87 - (void)pan:(UIPanGestureRecognizer *)pan{
 88     
 89     //开始绘制
 90     
 91     //获取手指当前的点
 92     CGPoint curP = [pan locationInView:self];
 93     if(pan.state == UIGestureRecognizerStateBegan){
 94         
 95             [self.path moveToPoint:curP];
 96         
 97         }else if(pan.state == UIGestureRecognizerStateChanged){
 98         
 99         [self.path addLineToPoint:curP];
100         
101         //重绘
102         [self setNeedsDisplay];
103     }
104     
105     
106 
107 }
108 
109 
110 
111 
112 
113 // Only override drawRect: if you perform custom drawing.
114 // An empty implementation adversely affects performance during animation.
115 - (void)drawRect:(CGRect)rect {
116     
117     [self.path stroke];
118     
119     
120 }
121 
122 
123 @end
部分代码

//详见粒子效果代码