刷新UIBarButtonItem上的动画 [英] Refresh animation on UIBarButtonItem

问题描述

我正在尝试使用UIBarButtonItem制作刷新动画，问题是不仅旋转而且将图像上下移动。

I am trying to make a "refresh" animation using a UIBarButtonItem, the problem is that is not only rotating but moving the image up and down a bit.

-(void)startRefreshButtonRotationAnimation {
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0];
    rotationAnimation.duration = 1;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = 1000;
    UIView *view = self.navigationItem.rightBarButtonItem.customView;
    [view.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

- (void)stopRefreshButtonRotationAnimation {
    UIView *view = self.navigationItem.rightBarButtonItem.customView;
    [view.layer removeAllAnimations];
}

推荐答案

检查图像，确保图像的中心位于微调器的中心（因为看起来很可能不是）。
进入您喜欢的图像编辑软件并将其居中，确保在导出时不会截断透明区域。

Check the image, make sure that the image's center is in the center of the spinner (because it looks like it most likely isn't). Go into your favourite image editing software and center it, making sure that when you export, the transparent areas aren't clipped off.

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