iphone - iOS 上的圆形按钮

Question

是否可以创建两个如下图所示的按钮？看起来您应该使用 UIButton 或 UIImageView，但如果我单击到区域 1，它仍然像单击按钮 1 一样。当我单击到区域 1 时，按钮 2 也应该被触发!

Answer 1

如果上述响应 Not Acceptable ，您可以实现 UIButton 的自定义子类来覆盖 pointInside:withEvent: .

假设您的 View 完全是正方形，图形完全是圆形并填满整个正方形，例如:

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    // check that the point is at least inside the normal rect
    if(![super pointInside:point withEvent:event]) return NO;

    // we'll assume a square view with an exact circle inside, so
    // the radius of the circle is just half the width
    CGFloat radius = self.bounds.size.width*0.5f;

    // the point (radius, radius) is also the centre of the view, so...
    CGFloat squareOfDistanceFromCentre =
          (radius - point.x)*(radius - point.x) +
          (radius - point.y)*(radius - point.y);

    // if the point is too far away, return NO
    if(squareOfDistanceFromCentre > radius*radius) return NO;

    // otherwise we've exhausted possible reasons for answering NO
    return YES;
}