ios - 如何存储所有选定的按钮值并在 UILabel 上显示它们？

Question

其实我只是想把它变成这样:

当用户点击按钮 1 时，它将其值存储在一个字符串中，当用户选择另一个按钮时；它还存储它的值，当他再次取消选择按钮时，它必须从字符串和 uiLabel 中删除

这怎么可能？

我必须知道所有可能的方法

Answer 1

1) 在您的 ViewController.m

中声明

@interface ViewController ()
{
    UIButton *button1;
    UIButton *button2;

    NSString *btn1String;
    NSString *btn2String;

    BOOL btn1isClicked;
    BOOL btn2isClicked;

    UILabel *label;
}

2) 按钮和标签(可以在你的ViewDidLoad中)

btn1isClicked = NO;
btn2isClicked = NO;

//initialy set to nothing
btn1String = @"";
btn2String = @"";

//create first button
button1 = [[UIButton alloc] initWithFrame:CGRectMake(0, 50, 200, 50)];
//button 1 clicked
[button1 addTarget:self action:@selector(button1Clicked) forControlEvents:UIControlEventTouchUpInside];
[button1 setTitle:@"Button One" forState:UIControlStateNormal];
[button1 setTitleColor:[UIColor purpleColor] forState:UIControlStateNormal];
[self.view addSubview:button1];

//create second button
button2 = [[UIButton alloc] initWithFrame:CGRectMake(0, 150, 200, 50)];
//button 2 clicked
[button2 addTarget:self action:@selector(button2Clicked) forControlEvents:UIControlEventTouchUpInside];
[button2 setTitle:@"Button Two" forState:UIControlStateNormal];
[button2 setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[self.view addSubview:button2];

//create label
label = [[UILabel alloc] initWithFrame:CGRectMake(0, 300, 320, 50)];
[label setText:@""];
[self.view addSubview:label];

3) 按钮点击方法

- (void) button1Clicked
{
    if (!btn1isClicked)
    {
        //set bool to yes
        btn1isClicked = YES;
        [button1 setTitle:@"Button One Clicked" forState:UIControlStateNormal];
        //set button 1 value
        btn1String = @"btn1value";
    }
    else
    {
        //set bool to no
        btn1isClicked = NO;
        [button1 setTitle:@"Button One" forState:UIControlStateNormal];
        btn1String = @"";
    }
    //update label
    [label setText:[NSString stringWithFormat:@"%@ %@", btn1String, btn2String]];
}

- (void) button2Clicked
{
    if (!btn2isClicked)
    {
        btn2isClicked = YES;
        [button2 setTitle:@"Button Two Clicked" forState:UIControlStateNormal];
        //set button 2 value
        btn2String = @"btn2value";
    }
    else
    {
        btn2isClicked = NO;
        [button2 setTitle:@"Button Two" forState:UIControlStateNormal];
        btn2String = @"";
    }
    //update label
    [label setText:[NSString stringWithFormat:@"%@ %@", btn1String, btn2String]];
}

希望对你有帮助