Throughout iOS 7 there's many situations where users can slide their finger in from the left or right edge of the screen in order to perform an action, such as popping a view controller or showing a sidebar.Throughout iOS 7 there's many situations where
阅读背景：
是否有内置的方法将手势识别器（特别是平移）添加到视图的右边缘或左边缘？
来源：互联网
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