iOS实现波浪效果

这篇文章主要为大家详细介绍了iOS实现波浪效果，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了iOS实现波浪效果的具体代码，供大家参考，具体内容如下

效果图.gif

代码：

@interface ViewController () 
@property (strong, nonatomic) CADisplayLink *displayLink;
@property (strong, nonatomic) CAShapeLayer *shapeLayer;
@property (strong, nonatomic) UIBezierPath *path;
@property (strong, nonatomic) CAShapeLayer *shapeLayer2;
@property (strong, nonatomic) UIBezierPath *path2;
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
 [super viewDidLoad]; 
 
 _shapeLayer = [CAShapeLayer layer];
 _shapeLayer.frame = CGRectMake(0, 100, 375, 150);
 [self.view.layer addSublayer:_shapeLayer];
  
 
 _shapeLayer2 = [CAShapeLayer layer];
 _shapeLayer2.frame = CGRectMake(0, 100, 375, 150);
 [self.view.layer addSublayer:_shapeLayer2];
 
 
 _shapeLayer.fillColor = [[UIColor yellowColor] colorWithAlphaComponent:0.3].CGColor;
 _shapeLayer2.fillColor = [[UIColor blueColor] colorWithAlphaComponent:0.3].CGColor; 
 
 _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(drawPath)];
 [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes]; 
 
} 
 
- (void)drawPath {
 
 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
 
 }
 
}

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