ios - 在多个 UITextField 的数字键盘上显示完成按钮

Question

@Luda's answer is a great answer ，但是当我需要将它用于多个文本字段时我被卡住了，所以我将其编辑如下:

首先，我为每个文本字段获取 IBOutlets，例如:textField1、textField2

然后我将代码编辑为

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
    numberToolbar.barStyle = UIBarStyleBlackTranslucent;
    numberToolbar.items = [NSArray arrayWithObjects:
                         [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(cancelNumberPad:)],
                         [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
                         [[UIBarButtonItem alloc]initWithTitle:@"Apply" style:UIBarButtonItemStyleDone target:self action:@selector(sendToServer:)],
                     nil];
    [numberToolbar sizeToFit];
    textField1.inputAccessoryView = numberToolbar;
    textField2.inputAccessoryView = numberToolbar;
}

-(void)cancelNumberPad:(UITextField *)textField
{
   //here I use if/else to determine which textField was tapped
   if(textField == self.textField1)
   {
      //do some stuff
   }else //...

}

-(void) sendToServer:(UITextField *)textField
{
    //here I use if/else to determine which textField was tapped
   if(textField == self.textField1)
   {
      //do some stuff
   }else //...
}

注意我必须添加冒号 :到 @selector例如 @selector(sendToServer:)这样，正确的 TextField 作为参数传递。

但是

它不工作。测试失败: if(textField == self.textField1) .那么有谁知道如何正确地做到这一点？

问题是:我如何知道正在编辑哪个文本字段？

Answer 1

您支票的原因if (textField == self.textField)失败是因为默认传递给 UIBarButtonItem 选择器的参数实际上是 UIBarButtonItem 本身。您可以通过在任一选择器方法中放置断点并检查 textField 参数来验证这一点。

一种可能的解决方案是，在不引入任何代码来循环 subview 的情况下，将您的 View Controller 声明为 UITextFieldDelegate，然后按如下方式修改您的选择器:

- (void)sendToServer:(UIBarButtonItem*)barButtonItem {
    [self.view endEditing:NO];
}

然后实现委托(delegate)方法textFieldShouldEndEditing:

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    // here you would determine which text field the UIBarButtonItem was associated with
   if(textField == self.textField1)
   {
       // your code here
       // and then, if you wanted to dismiss the keyboard
       return YES;
   } else {
       return NO;
   }
}