如何在一个圆圈内对齐UIButtons？

Question

比方说,我有20个按钮.如何以圆形格式添加此按钮的UIView的子视图？

Answer 1

这将按钮围绕给定中心的给定半径的圆圈放置.它还将使用transformUIView 的属性旋转每个按钮.

希望能帮助到你.:)

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSArray *buttons = /* you buttons here */
    float curAngle = 0;
    float incAngle = ( 360.0/(buttons.count) )*PI/180.0;
    CGPoint circleCenter = CGPointMake(160, 200); /* given center */
    float circleRadius = 100; /* given radius */
    for (UIButton *button in buttons)
    {
        CGPoint buttonCenter;
        buttonCenter.x = circleCenter.x + cos(curAngle)*circleRadius;
        buttonCenter.y = circleCenter.y + sin(curAngle)*circleRadius;
        button.transform = CGAffineTransformRotate(button.transform, curAngle);
        button.center = buttonCenter;
        [self.view addSubview:button];

        curAngle += incAngle;
    }
}

结果: