单项选择题
想要开始视图的多点触摸,须设置哪个属性为YES?()
A.userInteractionEnabled
B.clearContextsBeforeDrawing
C.multipleTouchEnabled
D.setNeedsDisplay
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单项选择题
A.userInteractionEnabled
B.clearContextsBeforeDrawing
C.multipleTouchEnabled
D.setNeedsDisplay
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