如何将按钮旋转回水平？

Question

我用一个不同的按钮制作一个圆圈，间隔相等。 这是它的样子：

我想这样做，以便图片不会旋转。我如何实现这一目标？这是代码。

- (void)drawWheel
{
    // Drawing the Wheel view
    wheelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 275, 275)];
    wheelView.center = self.view.center;
    wheelView.layer.cornerRadius = wheelView.frame.size.width / 2.0;
    wheelView.layer.borderColor = [UIColor whiteColor].CGColor;
    //wheelView.layer.borderWidth = 0.5f;

    CGFloat angleSize = 2 * M_PI / self.buttons.count;

    for(int i = 0; i < self.buttons.count; i++)
    {
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, wheelView.frame.size.width / 2.0, 40)];
        label.layer.anchorPoint = CGPointMake(1.0f, 0.5f);
        label.layer.position = CGPointMake(wheelView.bounds.size.width / 2.0, wheelView.bounds.size.height / 2.0);
        label.transform = CGAffineTransformMakeRotation(angleSize * i);
        label.backgroundColor = [UIColor clearColor];

        UIButton *button = [self.buttons objectAtIndex:i];
        button.center = CGPointMake(label.center.x, label.center.y + 15);
        button.transform = CGAffineTransformRotate(label.transform, 2 * (angleSize * i));
        [label addSubview:button];
        [wheelView addSubview:label];
    }

    [self.view addSubview:wheelView];
}

Answer 1

我没有检查，但你可以改变以下代码

button.transform = CGAffineTransformRotate(label.transform, 2 * (angleSize * i));

到

button.transform = CGAffineTransformMakeRotation(-1 * angleSize * i);

这里我只是将按钮旋转到相反的方向

Answer 2

我认为你可以这样做......

- (void)drawWheel
{
    // Drawing the Wheel view
    wheelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 275, 275)];
    wheelView.center = self.view.center;
    wheelView.layer.cornerRadius = wheelView.frame.size.width / 2.0;
    wheelView.layer.borderColor = [UIColor whiteColor].CGColor;
    //wheelView.layer.borderWidth = 0.5f;

    CGFloat angleSize = 2 * M_PI / self.buttons.count;

    for(int i = 0; i < self.buttons.count; i++)
    {
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, wheelView.frame.size.width / 2.0, 40)];
        label.layer.anchorPoint = CGPointMake(1.0f, 0.5f);
        label.layer.position = CGPointMake(wheelView.bounds.size.width / 2.0, wheelView.bounds.size.height / 2.0);
        label.transform = CGAffineTransformMakeRotation(angleSize * i);
        label.backgroundColor = [UIColor clearColor];

        UIButton *button = [self.buttons objectAtIndex:i];
        button.center = CGPointMake(label.center.x, label.center.y + 15);

        // change this line
        button.transform = CGAffineTransformMakeRotation(-angleSize * i);

        [label addSubview:button];
        [wheelView addSubview:label];
    }

    [self.view addSubview:wheelView];
}

这里我只是以相同的角度在另一个方向上转换按钮。

即。如果标签旋转35度，则按钮旋转-35度。这意味着按钮相对于标签的审查旋转了0度。