ios - 如何检查和取消选中ios中的按钮

Question

我是iOS的初学者，在我的项目中，我为用户“选中”和“取消选中”按钮插入了“3”按钮，如下图所示。

在这里，我的主要要求是当我单击“选中”按钮时，则应将其“取消选中”，而当我单击“未选中”按钮时，则应将其选中，如下图所示。



剩下的两个按钮必须“未选中”，为此，我在下面的代码中进行了编写，但这是一个漫长的过程。任何人都可以解释简单和简短的过程

我的代码:

 @interface ViewController ()
    {
        int check1;
        int check2;
        int check3;
        
        UIButton * button1;
        UIButton * button2;
        UIButton * button3;
    }
    
        
    @end
    
        
    @implementation ViewController
    
        




 - (void)viewDidLoad {
        [super viewDidLoad];
        
        check1 = 0;
        check2 = 0;
        check3 = 0;
        
        button1 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button1 addTarget:self
                   action:@selector(aMethod1:)
         forControlEvents:UIControlEventTouchUpInside];
        button1.frame = CGRectMake(10.0, 100.0, 30.0, 30.0);
        UIImage *btnImage1 = [UIImage imageNamed:@"uncheck.png"];
        [button1 setImage:btnImage1 forState:UIControlStateNormal];
        [self.view addSubview:button1];
        
        button2 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button2 addTarget:self
                    action:@selector(aMethod2:)
          forControlEvents:UIControlEventTouchUpInside];
        button2.frame = CGRectMake(50.0, 100.0, 30.0, 30.0);
        UIImage *btnImage2 = [UIImage imageNamed:@"uncheck.png"];
        [button2 setImage:btnImage2 forState:UIControlStateNormal];
        [self.view addSubview:button2];
        
        button3 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button3 addTarget:self
                    action:@selector(aMethod3:)
          forControlEvents:UIControlEventTouchUpInside];
        button3.frame = CGRectMake(100.0, 100.0, 30.0, 30.0);
        UIImage *btnImage3 = [UIImage imageNamed:@"uncheck.png"];
        [button3 setImage:btnImage3 forState:UIControlStateNormal];
        [self.view addSubview:button3];
        
    }
    
        



-(void)aMethod1 :(id)sender{
        
        if (check1 == 0) {
            
            UIImage *btnImage1 = [UIImage imageNamed:@"check.png"];
            
            [button1 setImage:btnImage1 forState:UIControlStateNormal];
            check1 = 1;
        }
        else{
        
            UIImage *btnImage1 = [UIImage imageNamed:@"uncheck.png"];
            [button1 setImage:btnImage1 forState:UIControlStateNormal];
            check1 = 0;
        }
    }
    
        




-(void)aMethod2 :(id)sender{
        
        if (check2 == 0) {
            
            UIImage *btnImage1 = [UIImage imageNamed:@"check.png"];
        
            [button2 setImage:btnImage1 forState:UIControlStateNormal];
            check2 = 1;
        }
        else{
            
            UIImage *btnImage1 = [UIImage imageNamed:@"uncheck.png"];
            [button2 setImage:btnImage1 forState:UIControlStateNormal];
            check2 = 0;
        }
    }

    


-(void)aMethod3 :(id)sender{
    
    if (check3 == 0) {
        
        UIImage *btnImage1 = [UIImage imageNamed:@"check.png"];
        
        [button3 setImage:btnImage1 forState:UIControlStateNormal];
        check3 = 1;
    }
    else{
        
        UIImage *btnImage1 = [UIImage imageNamed:@"uncheck.png"];
        [button3 setImage:btnImage1 forState:UIControlStateNormal];
        check3 = 0;
    }
}

   

Answer 1

首先将图像重命名为check_0.png(未选中的图像)和check_1.png(选中的图像)

步骤1:在界面中声明一个全局变量

@interface HomeViewController () {
    NSMutableArray *selctionArray;
}

步骤2:在viewDidLoad中初始化此数组并添加数据

[self initArrayData];

-(void) initArrayData {
    selctionArray = [[NSMutableArray alloc] init];
    for (int i=0;i<3;i++) {
        [selctionArray addObject:@"0"];
    }
}

步骤3:以编程方式创建3个按钮，并为其设置标签

首先创建三个按钮，以编程方式调用 clikcedButton作为Click侦听器。说按钮是按钮1，按钮2，按钮3。

button1.tag = 123451;
button2.tag = 123452;
button3.tag = 123453;

步骤4:假设第一个按钮已选中

// by-default first button will be checked
[selctionArray replaceObjectAtIndex:0 withObject:@"1"];
[self updateMyButtons];

-(void) updateMyButtons {
    UIButton *mButton;
    for (int i=0;i<3;i++) {
        mButton = (UIButton *)[self.view viewWithTag:123451+i];
        [mButton setBackgroundImage:[UIImage imageNamed:[NSString stringWithFormat:@"check_%@.png", [selctionArray objectAtIndex:i]] forState:UIControlStateNormal];
    }
}

步骤5:现在让我们实现IBAction

-(IBAction)clikcedButton:(id)sender {
    [self initArrayData];
    UIButton *mButton = (UIButton *) sender;
    int clickedButtonTag = mButton.tag;
    clickedButtonTag = clickedButtonTag - 123451;
    [selctionArray replaceObjectAtIndex:clickedButtonTag withObject:@"1"];
    [self updateMyButtons];
}

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