将值控制在0~0.999之间
MIN(0.999, MAX(0, timeoffset - x))
MIN 让值不大于0.999,MAX让值不小于0.
-(void)pan:(UIPanGestureRecognizer * )pan
{
CGFloat x =[pan translationInView:self.view].x;
x /= 200.0;
CFTimeInterval timeOffset = self.doorLayer.timeOffset;
timeoffset = MIN(0.999, MAX(0, timeoffset - x));
self.doorLayer.timeOffset = timeOffset;
[pan setTranslation:CGPointZero inView:self.view];
}
static float randomFloatBetween(float from, float to)
{
return from + ((float)rand()/(float)RAND_MAX) * (to - from);
}
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