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在我的 iPhone 应用程序中，我使用textFieldMain.accessibilityTraits = UIAccessibilityTraitUpdatesFrequently; 它在 ios 6 中运行良好，但在 ios 7 中无法运行。我该如何解决这个问题？
textFieldMain.accessibilityTraits = UIAccessibilityTraitUpdatesFrequently;