UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTap:)]; [self.view addGestureRecognizer:tap];

- (void)onTap:(UITapGestureRecognizer*)sender { CGPoint center = [sender locationInView:sender.view]; [FingerWaveView showInView:self.view center:center];}

#import <UIKit/UIKit.h>@interface FingerWaveView : UIView+ (instancetype)showInView:(UIView *)view center:(CGPoint)center;@end

#import "FingerWaveView.h"@interface FingerWaveView () <CAAnimationDelegate>{ CGSize waveSize; NSTimeInterval duration;}@end@implementation FingerWaveView- (instancetype)initWithFrame:(CGRect)frame{ self=[super initWithFrame:frame]; if (self) {  waveSize = CGSizeMake(150, 150);  duration = 1.0; } return self;}+ (instancetype)showInView:(UIView *)view center:(CGPoint)center { FingerWaveView *waveView = [FingerWaveView new]; [waveView setframeWithCenter:center]; [view addSubview:waveView]; return waveView;}- (void)didMoveToSuperview{ CAShapeLayer *waveLayer = [CAShapeLayer new]; waveLayer.backgroundColor = [UIColor clearColor].CGColor; waveLayer.opacity = 0.6; waveLayer.fillColor = [UIColor whiteColor].CGColor; [self.layer addSublayer:waveLayer]; [self startAnimationInLayer:waveLayer];}- (void)startAnimationInLayer:(CALayer *)layer{ UIBezierPath *beginPath = [UIBezierPath bezierPathWithArcCenter:[self pathCenter] radius:[self animationBeginRadius] startAngle:0 endAngle:M_PI*2 clockwise:YES]; UIBezierPath *endPath = [UIBezierPath bezierPathWithArcCenter:[self pathCenter] radius:[self animationEndRadius] startAngle:0 endAngle:M_PI*2 clockwise:YES]; CABasicAnimation *rippleAnimation = [CABasicAnimation animationWithKeyPath:@"path"]; rippleAnimation.delegate = self; rippleAnimation.fromValue = (__bridge id _Nullable)(beginPath.CGPath); rippleAnimation.toValue = (__bridge id _Nullable)(endPath.CGPath); rippleAnimation.duration = duration; CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"]; opacityAnimation.delegate = self; opacityAnimation.fromValue = [NSNumber numberWithFloat:0.6]; opacityAnimation.toValue = [NSNumber numberWithFloat:0.0]; opacityAnimation.duration = duration; [layer addAnimation:rippleAnimation forKey:@"rippleAnimation"]; [layer addAnimation:opacityAnimation forKey:@"opacityAnimation"];}- (void)setframeWithCenter:(CGPoint)center{ CGRect frame = CGRectMake(center.x-waveSize.width*0.5, center.y-waveSize.height*0.5, waveSize.width, waveSize.height); self.frame = frame;;}- (CGFloat)animationBeginRadius{ return waveSize.width*0.5*0.2;}- (CGFloat)animationEndRadius{ return waveSize.width*0.5;}- (CGPoint)pathCenter{ return CGPointMake(waveSize.width*0.5, waveSize.height*0.5);}#pragma mark - CAAnimationDelegate- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ if (flag) {  [self removeFromSuperview]; }}@end