ios - when trigger gesture cancel state? -

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the apple doc says

a recognizer continuous gesture can transition changed canceled (uigesturerecognizerstatecancelled) if decides gesture no longer fits expected pattern.

i want know when recognizer cancel state.for example, there's rotate gesture in view, if left 1 finger, gesture still in changed state, why not in cancel state?

cancel reserved instance system cancels gesture (for example, uialertview shown while gesture active, or user double taps home button show used apps list).


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