當前值CABasicAnimation

Question

所以我的動畫圓的路徑，例如（完美的作品）：

CGPoint center = CGPointMake([self bounds].size.width/2.0, [self bounds].size.height/2.0); 

circle.path = [UIBezierPath bezierPathWithArcCenter:center 
              radius:radius-13 startAngle:DEGREES_TO_RADIANS(0) endAngle:DEGREES_TO_RADIANS([self percentageToAngle:100]) clockwise:NO].CGPath; 


circle.fillColor = [UIColor clearColor].CGColor; 
circle.strokeColor = [UIColor blackColor].CGColor; 
circle.lineWidth = 27.0; 

[self.layer addSublayer:circle]; 

float currentAngle = [(NSNumber *)[ sublayer valueForKeyPath:@"strokeEnd" ] floatValue]; 

CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"]; 

drawAnimation.duration   = 2.0; 
drawAnimation.repeatCount   = 0.0; 
drawAnimation.removedOnCompletion = NO; 


drawAnimation.fromValue = [NSNumber numberWithFloat:0.0]; 
drawAnimation.toValue = [NSNumber numberWithFloat:1.0]; 

drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; 

drawAnimation.delegate = self; 
[drawAnimation setValue:kAnimationName forKey:kLayerName]; 
[circle addAnimation:drawAnimation forKey:kAnimationName]; 

如果我停止動畫中游，怎麼我得到的電流值，這是在哪裏？無論是角度還是fromValue和toValue之間的值？

Answer 1

停止動畫時試試這個。

float currentRad = [[[circle.layer presentationLayer] valueForKeyPath:@"transform.rotation.z"] floatValue];