- (void)viewDidLoad {
[super viewDidLoad];
//layer属性
//@property (nonatomic, strong) CAShapeLayer *shapeLayer3;
//定时移动的偏移量
//@property (nonatomic, assign) CGFloat tempTranslationX;
self.shapeLayer3 = [CAShapeLayer layer];
// 填充的颜色
self.shapeLayer3.fillColor = [[UIColor whiteColor] CGColor];
// 路径线条的颜色
self.shapeLayer3.lineWidth = 5;//0.1;
// 路径线条的颜色
self.shapeLayer3.strokeColor = [[UIColor greenColor] CGColor];
// 要实现动画的对象 添加到layer层
[self.aView.layer addSublayer:self.shapeLayer3];
//初始化偏移量
self.tempTranslationX = 0.1;
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.01f target:self selector:@selector(Stack) userInfo:nil repeats:YES];
}
-(void)Stack
{
NSLog(@"调用定时器");
// 绘制的路径
UIBezierPath *path = [UIBezierPath bezierPath];
CGFloat tempWaterWaveHeight = 50;
//定时器动态偏移量
self.tempTranslationX += 0.1;
//起点 (1)左上角的点
[path moveToPoint:CGPointMake(0, tempWaterWaveHeight)];
/*
y=Asin(ωx+φ)+b//三角函数公式
A振幅 控制最大值,最小值(控制波浪的幅度大小)
2π/ω是周期
φ表示初始x轴偏移量
b表示y轴偏移量
*/
CGFloat y = 0.0f;
for (float x = 0; x <= self.aView.frame.size.width; x++) {
//for内部添加波浪线上的点
y= 10 * sin( x / 180 * M_PI - self.tempTranslationX / M_PI ) + tempWaterWaveHeight;
//添加点 (2)右上角的点
[path addLineToPoint:CGPointMake(x, y)];
}
//(3)右下角的点
[path addLineToPoint:CGPointMake(self.aView.frame.size.width,self.aView.frame.size.height)];
//(4)左下角的点
[path addLineToPoint:CGPointMake(0, self.aView.frame.size.height)];
// [path addLineToPoint:CGPointMake(0, tempWaterWaveHeight)];
//这句话使(起点)和(终点)闭合 (4)
[path closePath];
self.shapeLayer3.path = [path CGPath];
}
屏幕快照 2019-05-30 上午9.46.00.png
