Question

使用此代码我正在尝试旋转图像。图像旋转但速度相同。我试图旋转平滑旋转的图像，但我不能这样做。这是我的代码：

(void)spinLayer:(CALayer *)inLayer duration:(CFTimeInterval)inDuration
    direction:(int)direction repeat:(int)repeat
{
    repeatcount = repeat+repeatcount;
    timer = [NSTimer scheduledTimerWithTimeInterval: inDuration target: self     selector:@selector(setCountLableValue) userInfo: nil repeats: YES];
    CABasicAnimation* rotationAnimation;
    rotationAnimation =
    [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.fromValue = [NSNumber numberWithFloat: M_PI *2.0 * direction];
    rotationAnimation.repeatCount = repeat;
    NSLog(@"Repeat count %d",repeat);
    rotationAnimation.duration = inDuration;
    rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    [inLayer addAnimation:rotationAnimation forKey:@"rotation"];

}

Answer 1

您可以使用不同的timingFunction。您使用线性函数，尝试其中一个而不是kCAMediaTimingFunctionLinear

NSString * const kCAMediaTimingFunctionEaseIn;
NSString * const kCAMediaTimingFunctionEaseOut;
NSString * const kCAMediaTimingFunctionEaseInEaseOut;

请参阅https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/CAMediaTimingFunction_class/Introduction/Introduction.html

关于重复问题，请在创建动画后尝试添加以下代码:(这只是一个想法，我真的不知道为什么缓动函数只使用一次）

rotationAnimation.removedOnCompleted = NO;
rotationAnimation.fillMode = kCAFillModeForwards;
rotationAnimation.cumulative = YES;

以平稳的速度旋转图像

1 个答案: