Question

我点击单击条形按钮时向下滑动UIView。到目前为止，这么好，但我遇到了一个问题。为了美观，我在视图中添加了一个底部边框，我想用UIView滑动动画为这个底部边框设置动画。问题是CABasicAnimation是有限的，不允许使用CurveEaseIn。因此，底部边框比UIView滑动得更快。

我该如何解决这个问题？

[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

最简单的解决方案几乎可以肯定是为底部边框使用视图而不是图层，然后使用UIKit而不是Core Animation为边框视图设置动画。

使用CALayer底部边框向下滑动UIView

1 个答案: