用CALayer下邊框向下滑動UIView

Question

我試圖在單擊欄按鈕時滑下UIView。到目前爲止，這麼好，但我遇到了一個問題。爲了美觀，我在視圖中添加了底部邊框，並且我想用UIView滑動動畫爲底部邊框設置動畫。問題是CABasicAnimation是有限的，不允許CurveEaseIn。所以，下邊框比UIView更快。

我該如何補救？

[UIView animateWithDuration:.5 delay:0.0 options:UIViewAnimationOptionCurveEaseIn animations:^{ 
      _navView.frame = CGRectMake(0, 0, 320, 350); 
      _navView.frame = CGRectMake(0, 0, 320, 350); 

      CALayer *oldLayer = [[_navView.layer sublayers] lastObject]; 
      CGRect oldFrame = oldLayer.frame; 
      CGRect newFrame = oldFrame; 
      newFrame.origin = CGPointMake(0, 350); 

      // Prepare the animation from the old size to the new size 
      CABasicAnimation *theAnimation = [CABasicAnimation animationWithKeyPath:@"frame"]; 
      theAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]; 
      theAnimation.duration = .5; 
      // Make this view controller the delegate so it knows when the animation starts and ends 
      theAnimation.delegate=self; 
      // Use fromValue and toValue 
      theAnimation.fromValue = [NSValue valueWithCGRect:oldFrame]; 
      theAnimation.toValue = [NSValue valueWithCGRect:newFrame]; 


      // Update the frame of the layer 
      oldLayer.frame = newFrame; 

      // Add the animation to the layer 
      [oldLayer addAnimation:theAnimation forKey:@"frame"]; 
    } completion:^(BOOL finished) { 
    }]; 

Answer 1

最簡單的方案几乎可以肯定是使用視圖，而不是一個層，你的下邊框，然後使用，而不是核心動畫UIKit的動畫邊框視圖。