iOS- 波浪效果简单实现

 //只跟相位有关
 
 
 
  
(void)creat4{
 
 
 
 
CGFloatW =CGRectGetWidth(self.view.bounds);
 
 
CGFloatH =CGRectGetHeight(self.view.bounds);
 
 
//公式:ω = 2π/T
 
 
//设置波的宽度是容器的宽度，希望能展示0.5个波曲线，周期为T=W/0.5;
 
 
//ω = 2π/T -> π/W
 
 
CGFloatw =M_PI/W;
 
 
if(self.shapeLayer==nil){
 
 
CAShapeLayer* layer = [CAShapeLayerlayer];
 
 
layer.fillColor= [UIColorcolorWithRed:211/255.0green:10/255.0blue:15/255.0alpha:1].CGColor;
 
 
[self.view.layeraddSublayer:layer];
 
 
self.shapeLayer= layer;
 
 
}
 
 
//振幅
 
 
self.waveA=20;
 
 
//ω常量
 
 
self.waveW= w;
 
 
//y轴偏移
 
 
self.currentK= H/2;
 
 
//相位
 
 
self.waveSpeed=0.05;
 
 
[selfdisplayLinkStar];
 
 
}
 
 
pragma mark- CADisplayLink计时器
 
 
//每一帧刷新一次，比NSTimer准确
 
 
 
  
(void)displayLinkStar{
 
 
 
 
CADisplayLink* link = [CADisplayLinkdisplayLinkWithTarget:selfselector:@selector(waveAnimation)];
 
 
[linkaddToRunLoop:[NSRunLoopcurrentRunLoop]forMode:NSRunLoopCommonModes];
 
 
}
 
 
pragma mark-绘制波浪
 
 
 
  
(void)waveAnimation{
 
 
 
 
self.offsetX+=self.waveSpeed;
 
 
CGFloatW =CGRectGetWidth(self.view.bounds);
 
 
CGFloatH =CGRectGetHeight(self.view.bounds);
 
 
CGMutablePathRefpath =CGPathCreateMutable();
 
 
CGFloaty =self.currentK;
 
 
CGPathMoveToPoint(path,nil,0, y);
 
 
for(NSIntegerx =0; x <= W; x++) {
 
 
y =self.waveAsinf(self.waveWx +self.offsetX) +_currentK;
 
 
CGPathAddLineToPoint(path,nil, x, y);
 
 
}
 
 
CGPathAddLineToPoint(path,nil,W, H*2/3);
 
 
CGPathAddLineToPoint(path,nil,0, H*2/3);
 
 
//self.shapeLayer.fillColor = [UIColor redColor].CGColor;
 
 
CGPathCloseSubpath(path);
 
 
self.shapeLayer.path= path;
 
 
CGPathRelease(path);
 
 
}