Question

我曾经使用以下代码在UIKeyboard上方添加一个UIToolbar并附加到它上面。我刚刚切换到iPhone OS 4，我意识到它已不再适用了。

for (UIWindow *keyboardWindow in [[UIApplication sharedApplication] windows]) {
    for (UIView *keyboard in [keyboardWindow subviews]) {

        //print all uiview descriptions

        if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES) {
            .. Some code to attach the UIToolbar
        }   
    }
}

我意识到代码没有进入if语句。我尝试在if上方打印出所有UIView描述，但是我看不到任何与UIKeyboard相关的内容。该代码在OS 3.0和3.1中运行良好。那么有人对此有任何想法吗？

Answer 1

您应该尝试使用以下代码：

  - (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");
                //add toolbar here

                UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, -40, 100, 40)];
                UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Test button" style:UIBarButtonItemStyleBordered target:self action:@selector(buttonClicked:)];
                NSArray *items = [[NSArray alloc] initWithObjects:barButtonItem, nil];
                [toolbar setItems:items];
                [items release];
                [currentView addSubview:toolbar];

                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];
}

您还需要将此代码添加到AppDelegate中的didFinishLaunchingWithOptions函数中：

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

Answer 2

由于您依赖于未记录的行为，因此它不再适用于4.0。请改用视图'inputAccessoryView属性，这是在OS 3.2 +中执行此操作的文档化方法。

UIKeyboard未添加到UIWindow子视图中

2 个答案: