完成按键仅用于数字键盘 [英] done button only for numberpad keyboard

问题描述

我正在开发iPhone应用程序。我在其中一个视图中有四个文本字段。在这四个文本字段中，我有一个文本字段，其中将使用数字键盘。但在数字键盘上没有返回键。所以我使用以下代码以编程方式添加了完成按钮。

I am working on the iPhone application. I have four textfields in one of the view. In these four textfield I have one textfield in which there will be use of numberpad keyboard. But on numberpad keyboard there is no return key. So I have added "Done"button programmatically by using following code.

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.2) {
    [[NSNotificationCenter defaultCenter] addObserver:self                  
            selector:@selector(keyboardDidShow:) 
                                                 name:UIKeyboardDidShowNotification object:nil];        
} else {
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification object:nil];
}

   - (void)addButtonToKeyboard {
// create custom button
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
doneButton.adjustsImageWhenHighlighted = NO;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.0) {
    [doneButton setImage:[UIImage imageNamed:@"DoneUp3.png"] forState:UIControlStateNormal];
    [doneButton setImage:[UIImage imageNamed:@"DoneDown3.png"] forState:UIControlStateHighlighted];
} else {        
    [doneButton setImage:[UIImage imageNamed:@"DoneUp.png"] forState:UIControlStateNormal];
    [doneButton setImage:[UIImage imageNamed:@"DoneDown.png"] forState:UIControlStateHighlighted];
}
[doneButton addTarget:self action:@selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
UIView* keyboard;
for(int i=0; i<[tempWindow.subviews count]; i++) {
    keyboard = [tempWindow.subviews objectAtIndex:i];
    // keyboard found, add the button
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.2) {
        if([[keyboard description] hasPrefix:@"<UIPeripheralHost"] == YES)
                               [keyboard addSubview:doneButton];                
    } else {
        if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES)
                   [keyboard addSubview:doneButton];
        }
     }
    }

     - (void)keyboardWillShow:(NSNotification *)note {
// if clause is just an additional precaution, you could also dismiss it
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 3.2) {

        [self addButtonToKeyboard];


}
  }

       - (void)keyboardDidShow:(NSNotification *)note {
// if clause is just an additional precaution, you could also dismiss it
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.2) {

        [self addButtonToKeyboard];


      }
   }


- (void)doneButton:(id)sender {
    NSLog(@"doneButton");
    NSLog(@"Input: %@", contactno.text);

    [contactno resignFirstResponder];

     }

这个特定的文本字段没问题。但是这个按钮也可以添加到其他文本字段中。如何取消隐藏其他文本字段的按钮。

It is fine for this particular textfield. But this button is also get add for the rest of the textfields. How could unhide this button for other textfields.

谢谢很多提前。

推荐答案

请求请求请求请请请不要这样做。 这太荒谬了。考虑一下：

Please please please please please please please please please please please please please do not do this. This is so ridiculously fragile. Consider this:

• 如果数字键盘的布局发生变化怎么办？


• 如果颜色怎么办？键的更改？


• 如果键盘的实现发生变化，使其不再是索引1处的窗口，该怎么办？


• 如果执行该怎么办？键盘和外围设备主机的更改，以便内省的描述中断？


• 如果你在iPad上运行这个键盘有一个完全不同的布局怎么办？

• what if the layout of the number keypad changes?
• what if the colors of the keys change?
• what if the implementation of the keyboard changes such that it's no longer the window at index 1?
• what if the implementation of the keyboard and peripheral host change such that introspecting the description breaks?
• what if you're running this on iPad where the keyboard has a totally different layout?

这些只是将你的用户界面变成私人视图层次结构所带来的无数问题。

These are just a couple of the myriad of problems that come with glomming your UI into private view hierarchies.

以下是2个替代方案：

1. 在每个 UIResponder 上使用 -inputAccessoryView 属性（因此每个 UIView ）使用完成按钮定义 UIToolbar 。当键盘进入和退出时， inputAccessoryView 将位于键盘上方。

1. Use the -inputAccessoryView property on every UIResponder (and thus every UIView) to define a UIToolbar with a "Done" button. The inputAccessoryView will be positioned above the keyboard as the keyboard animates in and out.

添加透明整个用户界面上的 UIView ，用于捕捉点按事件并导致键盘解除

Add a transparent UIView over your entire UI that captures tap events and causes the keyboard to dismiss

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