用NSNumber初始化CATransition持续时间

Question

我想用NSNumber初始化CATransition的持续时间，我该怎么做，因为animation.duration是NSTimeInterval对象？

- (void)startPopUpAnimation:(NSNumber *)numbers { 

    CATransition *animation = [CATransition animation]; 
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; 
    animation.type = kCATransitionFade; 
    animation.duration = @"2.15";//[NSNumber numberWithDouble:[numbers doubleValue]]; 

} 

Answer 1

这是更容易比我想象：

animation.duration是typedef double，所以我只是做：animation.duration = [numbers doubleValue];