炫酷波浪效果动画

炫酷波浪效果动画

GitHub地址

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实现思想

主要要根据振幅、偏移、角速度使用贝塞尔曲线来画出整个过程

核心代码

static double i = 0; 

 CGFloat A = 10.f;//A振幅 
 CGFloat k = 0;//y轴偏移 
 CGFloat ω = 0.03;//角速度ω变大，则波形在X轴上收缩（波形变紧密）；角速度ω变小，则波形在X轴上延展（波形变稀疏）。不等于0 
 CGFloat φ = 0 + i;//初相，x=0时的相位；反映在坐标系上则为图像的左右移动。 

 //y=Asin(ωx+φ)+k  

 _path = [UIBezierPath bezierPath]; 
 _path2 = [UIBezierPath bezierPath];  

 [_path moveToPoint:CGPointZero]; 
 [_path2 moveToPoint:CGPointZero]; 
 for (int i = 0; i < 376; i ++) { 

  CGFloat x = i; 

  CGFloat y = A * sin(ω*x+φ)+k; 
  CGFloat y2 = A * cos(ω*x+φ)+k; 
  [_path addLineToPoint:CGPointMake(x, y)]; 
  [_path2 addLineToPoint:CGPointMake(x, y2)]; 

 } 
 [_path addLineToPoint:CGPointMake(375, -100)]; 
 [_path addLineToPoint:CGPointMake(0, -100)]; 
 _path.lineWidth = 1; 
 _shapeLayer.path = _path.CGPath;  

 [_path2 addLineToPoint:CGPointMake(375, -100)]; 
 [_path2 addLineToPoint:CGPointMake(0, -100)]; 
 _path2.lineWidth = 1; 

  _shapeLayer2.path = _path2.CGPath; 



 i += 0.1; 

 if (i > M_PI * 2) { 

  i = 0;//防止i越界 

 } 

效果

来源：oschina

链接：https://my.oschina.net/u/2994392/blog/3011277