我正在使用CABasicAnimation顺时针旋转UI
ImageView 90度,但是在最初90度旋转之后,我需要将其从其位置再旋转90度.
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.duration = 10; animation.additive = YES; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; animation.fromValue = [NSNumber numberWithFloat:DEGREES_TO_RADIANS(0)]; animation.toValue = [NSNumber numberWithFloat:DEGREES_TO_RADIANS(90)]; [_myview.layer addAnimation:animation forKey:@"90rotation"];
使用上面的代码最初起作用,图像保持在90度角.如果我再次打电话给它,使其旋转90度,则动画将通过跳回到0并旋转90度,而不是90到180度.
我的印象是animation.additive = YES;将会使进一步的动画以当前状态为起点.
有任何想法吗？
解决方法
通过角度增量值查看我的代码
static int imgAngle=0;
- (void)doAnimation
{
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
animation.duration = 5;
animation.additive = YES;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
animation.fromValue = [NSNumber numberWithFloat:DEGREES_TO_RADIANS(imgAngle)];
animation.toValue = [NSNumber numberWithFloat:DEGREES_TO_RADIANS(imgAngle+90)];
[self.imgView.layer addAnimation:animation forKey:@"90rotation"];
imgAngle+=90;
if (imgAngle>360) {
imgAngle = 0;
}
}
以上代码只是想法.它没有测试
