ios – 使用CABasicAnimation多次旋转UIImageView

概述我正在使用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;animati 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

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