- (void)viewDidLoad {
[super viewDidLoad];
CGFloat bezierPathH = self.view.bounds.size.height - 200;
UIBezierPath *bezierPath = [[UIBezierPath alloc] init];
[bezierPath moveToPoint:CGPointMake(self.view.bounds.size.width / 2, 100)];
// 三次贝塞尔曲线
[bezierPath addCurveToPoint:CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height - 100) controlPoint1:CGPointMake(self.view.bounds.size.width / 4 * 3, bezierPathH / 4 + 100) controlPoint2:CGPointMake(self.view.bounds.size.width / 4, bezierPathH / 4 * 3 + 100)];
CAShapeLayer *pathLayer = [CAShapeLayer layer];
pathLayer.path = bezierPath.CGPath;
pathLayer.fillColor = [UIColor clearColor].CGColor;
pathLayer.strokeColor = [UIColor redColor].CGColor;
pathLayer.lineWidth = 3.0f;
[self.view.layer addSublayer:pathLayer];
CALayer *shipLayer = [CALayer layer];
shipLayer.frame = CGRectMake(0, 0, 64, 64);
shipLayer.position = CGPointMake(self.view.bounds.size.width / 2, 100);
shipLayer.contents = (__bridge id)[UIImage imageNamed:@"ship"].CGImage;
[self.view.layer addSublayer:shipLayer];
CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
animation.keyPath = @"position";
animation.path = bezierPath.CGPath;
animation.duration = 4.0;
animation.rotationMode = kCAAnimationRotateAuto;
[shipLayer addAnimation:animation forKey:nil];
}
iOS沿一个贝塞尔曲线对图层做动画
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