如果有人能告诉我, 如何判断两件物品是否触动(图像或按钮), 我知道如何让它们拖动, 但又不知道它们是否触动,
谢谢!
如果您从未旋转对象,您可以使用 CoreGraphics 函数。
BOOL objectsTouch = CGRectIntersectsRect(object1.frame, object2.frame);
当然,这要求两个对象处于同一个超视图中。 否则, 您必须使用 NSVV 的功能转换框架 。
经典的方法是计算一个包含每个对象的最小圆, 然后计算圆中心( Pytagoren 定理) 之间的距离, 并查看它是否小于 R( object1 圆) + R( object2 圆) 。 如果小于此, 您必须下移, 并用位图或其他方案来脏取, 但如果更大的话, 您可以假设对象不触摸 。
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