今天寫了這個：
CGRectContainsPoint(rect, anotherRect.origin)
Xcode 8 告訴我，
這個方式被調整成這個寫法：
rect.contains(anotherRect.origin)
除了移除 C style 的全域方法呼叫方式，使用時的語意相較起來比較合理清楚，也更加物件導向。
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