ios - RotationModeはCAKeyframeAnimation（線形パス）では機能しません

Question

パス（線形パス）を通過する限りビューを回転させようとしますが、回転しません。

これは私のコードです：

 CAKeyframeAnimation *animKF = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animKF.values = [NSArray arrayWithObjects:[NSValue valueWithCGPoint:CGPointMake(100, 100)], [NSValue valueWithCGPoint:CGPointMake(400, 400)], [NSValue valueWithCGPoint:CGPointMake(700, 100)], [NSValue valueWithCGPoint:CGPointMake(1000, 400)], nil];

animKF.keyTimes = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:0.25], [NSNumber numberWithFloat:0.5], [NSNumber numberWithFloat:1.0], nil];

animKF.duration = 6;

animKF.rotationMode =  kCAAnimationRotateAuto;

[imageView.layer addAnimation:animKF forKey:@"keyframe"];

ただし、imageView（画像の青い面）はパス（画像の赤い線）に沿って回転しません

どうもありがとう。

Answer 1

From the documentation of rotationMode:

The effect of setting this property to a non-nil value when no path object is supplied is undefined.

In your code you are setting the values-property of your key frame animation but you need to set a path instead.

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You should create a CGPath from your values and set that as the path of your keyframe.

UIBezierPath *animationPath = [UIBezierPath bezierPath];
[animationPath moveToPoint:CGPointMake(100, 100)];
[animationPath addLineToPoint:CGPointMake(400, 400)];
[animationPath addLineToPoint:CGPointMake(700, 100)];
[animationPath addLineToPoint:CGPointMake(1000, 400)];

animKF.path = animationPath.CGPath;