間接和SDK安全的方法是使文本字段成為第一響應者。如果存在外部鍵盤，則UIKeyboardWillShowNotification不應發(fā)布本地通知。

更新：自iOS 9以來不再適用，但您可以使用鍵盤尺寸來確定是否涉及硬件或軟件鍵盤。

您可以收聽"GSEventHardwareKeyboardAttached"（kGSEventHardwareKeyboardAvailabilityChangedNotification）Darwin通知，但這是一個私有API，因此如果您使用此應用程序，您的應用程序可能會被拒絕。要檢查外部硬件是否存在，請使用私有GSEventIsHardwareKeyboardAttached()功能。

UIKit會監(jiān)聽并相應地設置UIKeyboardImpl.isInHardwareKeyboardMode屬性，但這又是私有API。

if條件確定鍵盤的底部是否超出self.view的框架。“convertRect”規(guī)范化任何方向的框架。

- (void)keyboardWillShow:(NSNotification *)notification {

keyboardFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

keyboardFrame = [self.view convertRect:keyboardFrame fromView:nil]; // convert orientation

keyboardSize = keyboardFrame.size;

//NSLog(@"keyboardFrame.origin.y = %f", keyboardFrame.origin.y);

//NSLog(@"keyboardFrame.size.height = %f", keyboardFrame.size.height);

BOOL hardwareKeyboardPresent = FALSE;;

if ((keyboardFrame.origin.y + keyboardFrame.size.height) > (self.view.frame.size.height+self.navigationController.navigationBar.frame.size.height)) {

    hardwareKeyboardPresent = TRUE;

}

//NSLog(@"bottomOfKeyboard = %f", bottomOfKeyboard);

//NSLog(@"self.view.frame.size.height = %f", self.view.frame.size.height);