带有 iPhone OS 4 的 UI 键盘

Question

您好，我在 iPhone 4.0 操作系统上遇到了一个大问题，这段代码

if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES) {
}

在 UIKeyboard 无法工作的情况下。我尝试“UILayoutContainerView” 但它也不起作用。

请。

Answer 1

您可以尝试以下代码：

- (BOOL) findKeyboard:(UIView *) superView; 
{
    UIView *currentView;
    if ([superView.subviews count] > 0) {
        for(int i = 0; i < [superView.subviews count]; i++)
        {

            currentView = [superView.subviews objectAtIndex:i];
            NSLog(@"%@",[currentView description]);
            if([[currentView description] hasPrefix:@"<UIKeyboard"] == YES)
            {

                NSLog(@"Find it");

                return YES;
            }
            if ([self findKeyboard:currentView]) return YES;
        }
    }

    return NO;

}

-(void) checkKeyBoard {
    UIWindow* tempWindow;

    for(int c = 0; c < [[[UIApplication sharedApplication] windows] count]; c ++)
    {
        tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:c];
        if ([self findKeyboard:tempWindow])
            NSLog(@"Finally, I found it");  
    }
}

- (void)keyboardWillShow:(NSNotification *)note {
    [self performSelector:(@selector(checkKeyBoard)) withObject:nil afterDelay:0];
}

并且您还需要将此代码添加到AppDelegate中的函数didFinishLaunchingWithOptions中：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

Answer 2

@"<UIPeripheralHostView" will work instead of @"<UIKeyboard"

不知道为什么。

那么你能告诉我：如何在UIKeyboard类中确定键盘类型吗？