如何存储所有选定的按钮值并在 UILabel 上显示它们？

Posted 2023-03-21

【中文标题】如何存储所有选定的按钮值并在 UILabel 上显示它们？

【英文标题】：How to store all selected buttons values and show them on UILabel?

【发布时间】：2014-08-24 12:04:53

【问题描述】：

其实我只是想让它像：

当用户点击按钮 1 时，它将其值存储在字符串中，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

【参考方案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）

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

【参考方案2】：

-(IBActions)buttonDidTap:(UIButton*)btn   //the target selector the button is attached to


   if ([btn isSelected])  //check if the button is selected

      NSString *buttonTitleValue = btn.currentTitle; //Get the button title value
      myLabel.text = buttonTitleValue; //set the UIlabel text to the title of the button 

   

见：https://developer.apple.com/library/ios/documentation/uikit/reference/UIButton_Class/UIButton/UIButton.html#//apple_ref/occ/instp/UIButton/currentTitle