`touchesBegan:withEvent:` is delayed at left edge of screen
问题 I'm experiencing an issue where the first call to touchesBegan:withEvent: on a UIView or UIViewController is delayed when you touch on the left edge of the screen. This seems to be a new issue with iOS 10, and only happens on devices with 3D Touch (iPhone 6s and newer). In fact, if you disable 3D Touch in General->Accessibility, the issue goes away. However, the issue doesn't seem to happen when you use UIGestureRecognizers . My workaround at the moment is to create a UIGestureRecognizer