ios - UIFeedback 触觉引擎被调用的次数比被激活的次数多

Question

我在 swift 2.3 中使用 UIFeedback Haptic Engine，例如:

let generator = UINotificationFeedbackGenerator()
generator.notificationOccurred(.Warning)

和

let generator = UIImpactFeedbackGenerator(style: .Heavy)
generator.impactOccurred()

今天又出现了一种新的错误，找不到问题所在。你有什么想法吗？

UIFeedbackHapticEngine _deactivate] called more times than the feedback engine was activated

详细信息:

Fatal Exception: NSInternalInconsistencyException
0  CoreFoundation                 0x1863e41c0 __exceptionPreprocess
1  libobjc.A.dylib                0x184e1c55c objc_exception_throw
2  CoreFoundation                 0x1863e4094 +[NSException raise:format:]
3  Foundation                     0x186e6e82c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]
4  UIKit                          0x18cc43fb8 -[_UIFeedbackEngine _deactivate]
5  UIKit                          0x18cad781c -[UIFeedbackGenerator __deactivateWithStyle:]

Answer 1

UIImpactFeedbackGenerator 不是线程安全的，因此请确保您同步调用 generator.impactOccurred() 而不是在 dispatch_async 或另一个异步线程。