The situation will determine the location of the encounter in the development of iOS
iOS these features have their own function implementation.
Determining whether a point in this region rect
bool CGRectContainsPoint (CGRect rect, CGPoint point )
determines whether a rect rect in another
bool CGRectContainsRect (CGRect rect1, CGRect rect2 )
IOS determining how a point in a specified area
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Origin www.cnblogs.com/Free-Thinker/p/11354059.html
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