Question

我在ScrollViewController中有一个Scrollview，并且在另一个ViewController（RadioViewController）中创建了单选按钮。这是我在RadioViewController中创建单选按钮的代码：

- (void)setupBtn{

    self.radioBtn = [UIButton buttonWithType: UIButtonTypeCustom];
    [self.radioBtn setFrame:CGRectMake(40,38,18,18)];
    [self.radioBtn setImage: [UIImage imageNamed:@"radio-button"]forState:UIControlStateNormal];
    [self.radioBtn setImage: [UIImage imageNamed:@"radio-button-select"]forState: UIControlStateSelected];
    [self.radioBtn addTarget:self action:@selector(radioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.radioBtn];
    } 
- (void)radioButtonTapped:(UIButton*)sender{
    NSLog(self.radioBtn.isSelected? @"Yes" : @"No");

    if (self.radioBtn.isSelected) {
        [self.radioBtn setSelected:NO];
        self.view1.backgroundColor =[UIColor clearColor];
        [self.radioBtn setImage:[UIImage imageNamed:@"radio-button"] forState:UIControlStateSelected];
    }else {
        [self.radioBtn setSelected:YES];
        self.view1.backgroundColor = [UACFCustomColors continentalLightBlueTransparent];
        [self.radioBtn setImage:[UIImage imageNamed:@"radio-button-select"] forState:UIControlStateSelected];

    }


}

我总是得到self.radioBtn.isSelected = NO;

当我选择一个单选按钮时，如果还选择了其他任何单选按钮，如何将那些单选按钮的状态设置为“否”？

Answer 1

如果要更改视图组的图像，则每个视图都需要唯一的键。

在您的方案中，为每个按钮指定了标签ID，如果用户选择了该按钮，请保留该标签ID并重新加载所有按钮。如果您的标签ID与任何按钮标签都匹配，则将该按钮设置为选中状态。

Answer 2

将您的代码更改为以下代码。

BOOL radioButtonClicked;

-(void)setupBtn{
self.radioBtn = [UIButton buttonWithType: UIButtonTypeCustom];
[self.radioBtn setFrame:CGRectMake(40,38,18,18)];
[self.radioBtn setImage: [UIImage imageNamed:@"radio-button"]forState:UIControlStateNormal];
[self.radioBtn setImage: [UIImage imageNamed:@"radio-button-select"]forState: UIControlStateSelected];
[self.radioBtn addTarget:self action:@selector(radioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.radioBtn];
radioButtonClicked = YES; // Add a boolean flag and set to YES
} 

-(void)radioButtonTapped:(UIButton*)sender{
NSLog(self.radioBtn.isSelected? @"Yes" : @"No");

if (radioButtonClicked) {
   radioButtonClicked = NO;
   self.view1.backgroundColor =[UIColor clearColor];
   [self.radioBtn setImage:[UIImage imageNamed:@"radio-button"] forState:UIControlStateSelected];
   }
else {
    radioButtonClicked = YES;
    self.view1.backgroundColor = [UACFCustomColors continentalLightBlueTransparent];
    [self.radioBtn setImage:[UIImage imageNamed:@"radio-button-select"] forState:UIControlStateSelected];

   }
}

如何取消选择单选按钮（UIButton）的先前状态

2 个答案: