ios - 如何删除 UITextfield 并在 iOS 中从中输入数据

Question

我开发了一个应用程序，其中有两个名为 [+] 和 [-] 的 UIButton 以及一个默认的 UITextField。

现在我想要的是，当我点击加号 [+] 按钮时，它应该在 UIView 中添加一个 UITextField ，这是完美的我但是当我点击减号 [-] 按钮时，它应该删除最后创建的 UITextField 现在对我不起作用。

如何管理？

这是我加[+]按钮的代码。

- (IBAction)btnPlusClicked:(id)sender{    scrollViewSpecialitiesTxtFields.hidden = FALSE;    float y;    y = (35 * txtSpecialityFieldCounter);    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, y, 120, 30)];    textField.delegate = self;    textField.borderStyle = UITextBorderStyleRoundedRect;    [arraySpecialitiesTxtFields insertObject:textField atIndex:arraySpecialitiesTxtFields.count];    scrollViewSpecialitiesTxtFields.contentSize = CGSizeMake(125, y+30);    [scrollViewSpecialitiesTxtFields addSubview:textField];    txtSpecialityFieldCounter++;    NSLog(@"txtSpecialityFieldCounter : %d",txtSpecialityFieldCounter);}

here is my minus [-] button code

-(IBAction)btnMinusClicked:(id)sender
{
    [scrollViewSpecialitiesTxtFields.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

    txtSpecialityFieldCounter--;
    NSLog(@"txtSpecialityFieldCounter : %d",txtSpecialityFieldCounter);

    float y;

    y = (35 * txtSpecialityFieldCounter);

    for(int i = 0 ; i < txtSpecialityFieldCounter; i++)
    {
        UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, y, 120, 30)];
        textField.delegate = self;
        textField.borderStyle = UITextBorderStyleRoundedRect;

        [arraySpecialitiesTxtFields insertObject:textField atIndex:arraySpecialitiesTxtFields.count];

        scrollViewSpecialitiesTxtFields.contentSize = CGSizeMake(125, y-30);
        [scrollViewSpecialitiesTxtFields addSubview:textField];
    }
}

我知道 minus[-] 按钮代码是错误的，但让我知道更改

Answer 1

创建一个全局变量作为 NSMutableArray *myAddedTextfields 并在 viewDidLoad-> myAddedTextFields = [NSMutableArray array];

- (IBAction)plusAction:(id)sender 
{
UITextField *textField1 = [[UITextField alloc]initWithFrame:CGRectMake(50, 50, 100, 20)];

textField1.text = @"hey how r u";

textField1.backgroundColor = [UIColor grayColor];

textField1.tag = 1;
[self.view addSubview:textField1];
[myAddedTextFields addObject:textField1];
}

- (IBAction)minusAction:(id)sender 
{
UITextField *txtField = [myAddedTextFields objectAtIndex:myAddedTextFields.count -1]; //for deleting from the last textfield onwards.

[txtField removeFromSuperView];
[myAddedTextFields removeObjectIdenticalTo:txtField];

}

我已经编辑了你的方法..希望这对你有帮助。