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CGaffilinetransformmakerotation在变基之前

cabasicanimation animation ios4 ios objective-c

Brian Liang · 技术社区 · 14 年前

在执行旋转动画之前,我首先执行uiImageView的旋转:

// rotate to the left by 90 degrees
someView.transform = CGAffineTransformMakeRotation((-0.5)*M_PI);

然后在视图上旋转180度…但它似乎是从原始位置开始旋转图像,就好像它不是最初旋转的一样。

- (void)rotateIndicatorToAngle: (UIView *)view angle: (NSNumber *)angleInDegrees
{
    CALayer *layer = view.layer;
    CGFloat duration = 5.0;
    CGFloat radians = [self ConvertDegreesToRadians: [angleInDegrees floatValue]];
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: radians];
    rotationAnimation.duration = duration;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = 1.0;
    rotationAnimation.removedOnCompletion = NO;
    rotationAnimation.fillMode = kCAFillModeForwards;
    rotationAnimation.timingFunction = [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionEaseOut];

[layer addAnimation: rotationAnimation forKey: @"rotationAnimation"];
}

给出了什么?

2 回复 | 直到 14 年前

jv42 14 年前

rotationAnimation.cumulative = YES;

你试过用吗 rotationAnimation.additive = YES; 而不是累积?

jv42 14 年前

您可以使用 UIView 要轻松设置视图动画:

[UIView beginAnimation: @"Rotate" context: nil];
[UIView setAnimationDuration: 5.0f];
[UIView setAnimationCurve: UIViewAnimationCurveEaseOut];

CGFloat radians = [self ConvertDegreesToRadians: [angleInDegrees floatValue]];
view.transform = CGAffineTransformMakeRotation(radians);

[UIView commitAnimation];

这就是我大部分时间使用的,不需要使用层。

更新:我的意思是,在这种情况下,我发现不使用层更容易,在使用层上没有贬低的价值。

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