如何在单击 UIButton 时将金额添加到 UITextField

Question

我有一个UITextField 和下面那个 3 按钮。用户可以在UITextField中输入金额。并且当用户单击下面的按钮UITextField 时，它将在UITextField 中添加金额，并在按钮中写入金额。

第一个按钮会加 100，第二个按钮会加 500，第三个会加 1000。实现它的最佳方法是什么。

我尝试实现以下但得到 button.tag=0

/*Amount increment*/
- (IBAction)Btn_Incr100:(id)sender {
    [self addTextFieldValue:nil];
}

- (IBAction)Btn_Incr500:(id)sender {
    [self addTextFieldValue:nil];
}

- (IBAction)Btn_Incr1000:(id)sender {
    [self addTextFieldValue:nil];
}



-(void)tagNumber{

    Btn_Incr100.tag=1;
    Btn_Incr500.tag=2;
    Btn_Incr1000.tag=3;


}

-(void) addTextFieldValue:(UIButton*) button
{
    int amount=[Txt_Amount.text intValue];
    int AddAmount;
    NSLog(@"button.tag%d",button.tag);


    if (button.tag==1) {
        AddAmount=100;

    }
    else if (button.tag==2) {
        AddAmount=500;

    }
    else if(button.tag==3) {
        AddAmount=1000;

    }else{
        AddAmount=0;

    }

    amount=amount+AddAmount;

    Txt_Amount.text=[NSString stringWithFormat:@"%d",amount];

    NSLog(@"%d",amount);
    NSLog(@"%@",Txt_Amount.text);



}

Answer 1

通过实现标签尝试使用它

- (void)viewDidLoad {
    [super viewDidLoad];
    [self tagNumber];
}


-(void)tagNumber{

    Btn_Incr100.tag=1;
    Btn_Incr500.tag=2;
    Btn_Incr1000.tag=3;


}

-(void) addTextFieldValue:(UIButton*) button
{
    int amount=[Txt_Amount.text intValue];
    int AddAmount;

    int buttonTagIndex = button.tag;
    switch (buttonTagIndex) {
        case 1:
            AddAmount=100;

            break;
        case 2:
            AddAmount=500;

            break;
        case 3:
            AddAmount=1000;
            break;
        default:
             AddAmount=0;
            break;
    }

    amount=amount+AddAmount;
    Txt_Amount.text=[NSString stringWithFormat:@"%d",amount];



}

- (IBAction)btnAmountClick:(id)sender{
    UIButton *button = sender;
    [self addTextFieldValue:button];


}

Answer 2

借助这个你可以实现：

-(void)displayvalue:(id)sender {       
    UIButton *resultButton = (UIButton *)sender;
    NSLog(@" The button's title is %@." resultButton.currentTitle);
}

现在您可以在文本字段中设置此文本。

Answer 3

将此方法添加为每个按钮操作。

-(void) addTextFieldValue:(UIButton*) button
{
        NSString *string;

        if ([button.text hasPrefix:@"+"] && [button.text length] > 1)
        {
            string = [string substringFromIndex:1];
        }

        int textFieldValue =[textField.text integerValue] + string.integerValue;
        textField setText:[NSString stringWithFormat:@"%i",textFieldValue];
}

Answer 4

  NSString *string;

    if ([button.text hasPrefix:@"+"] && [button.text length] > 1)
    {
        string = [string substringFromIndex:1];
    }

    int textFieldValue =[textField.text integerValue] + string.integerValue;
    textField setText:[NSString stringWithFormat:@"%i",textFieldValue];

或 连接不同的动作

   -(IBAction) onClick1: (id) sender]
 { 
        NSLog(@"User clicked %@", sender);
        textField.text = [textField.text integerValue] + 100
 }

Answer 5

You can do this way -

The three buttons below your textfield, link them all to a common method say,
-(IBAction)addBtnClicked:(UIButton *)btn

Given tags to three buttons like for button 100,
btn1.tag=100..
then for button 500, 
btn2.tag = 500..
then for button 1000, btn2.tag = 1000.

then in 
-(IBAction)addBtnClicked:(UIButton *)btn
{
int value = -1;
  if(btn.tag == 100)
{
  value =[txtFldText.text intValue] + 100;
}
else if(btn.tag == 500)
{
  value =[txtFldText.text intValue] + 500;
}
else if(btn.tag == 1000)
{
  value =[txtFldText.text intValue] + 1000;
}

txtFldText.text = [NSString stringWithFormat:@"%d",value];

}

Answer 6

你可以这样做：

 - (void)viewDidLoad
{
   [super viewDidLoad];
   // Do any additional setup after loading the view, typically from a nib.

   _txtAmount.text=@"0";

   _btn100.tag=100;
   _btn500.tag=500;
   _btn1000.tag=1000;


}

- (IBAction)btnAmountClick:(id)sender
{
   UIButton *btn=sender;

   if (btn.tag==100)
   {
     [self addAmount:@"100"];

   }
   if (btn.tag==500)
   {
     [self addAmount:@"500"];

   }
   if (btn.tag==1000)
   {
     [self addAmount:@"1000"];

   }

}


-(void)addAmount:(NSString*)strAmount
{
   int amount=[_txtAmount.text intValue]+[strAmount intValue];
   _txtAmount.text=[NSString stringWithFormat:@"%d",amount];

}

Answer 7

首先为每个按钮设置标签，例如 0,1,2。

然后将所有按钮的 IBOutlet 连接到单个 IBAction 和 如下实施 IBAction。

 - (IBAction)btnClicked:(id)sender
 {

   switch ([sender tag]) {

     case 0:
    {
        NSString *s=self.txtField.text;
        int add=[s intValue]+ 100;
        self.txtField.text=[NSString stringWithFormat:@"%d",add];

        break;
    }
    case 1:
    {
        NSString *s=self.txtField.text;
        int add=[s intValue]+ 200;
        self.txtField.text=[NSString stringWithFormat:@"%d",add];
    }
        break;

    case 2:
    {
        NSString *s=self.txtField.text;
        int add=[s intValue]+ 500;
        self.txtField.text=[NSString stringWithFormat:@"%d",add];
    }
        break;

    default:
        break;
  }

} 

Answer 8

对此有更好的解决方案。 您可以按不同方式使用标签。 只需将您的三个按钮作为操作绑定到此方法并将标签设置为 100/500/1000

- (void)buttonAction:(id)sender {
    textField.text = [NSString stringWithFormat:@"%li", (long)(textfield.text.intValue + sender.tag)]; 
}