“pointInside：”如何运作？

Question

我正在进行一些热门测试并遇到了令人困惑的情况。

我有两个按钮“favoriteButton”和“shareButton”。即使按钮不重叠，以下代码也会导致'a'和'b'为真：

CGPoint dunno = CGPointMake(11, 7);

BOOL a = [self.favoriteButton pointInside:dunno withEvent:nil];
BOOL b = [self.shareButton pointInside:dunno withEvent:nil];

并且只是为了证明这一点，这里是这个代码被调用时两个按钮的描述输出。

Printing description of _favoriteButton:
<UIButton: 0x5da8c90; frame = (10 6; 37 35); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x5da8d40>>
Printing description of _shareButton:
<UIButton: 0x5da7150; frame = (46 6; 30 35); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x5da59b0>>

这是怎么回事？我误解了输出应该是什么？

Answer 1

根据文件

，@ Nippysaurus

http://developer.apple.com/library/iOS/documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/instm/UIView/pointInside:withEvent：

A point that is in the receiver’s local coordinate system (bounds).

这意味着点CGPoint dunno = CGPointMake(11, 7);位于视图内部，因为视图的边界将与同一视图的帧不同。