Question

我是iPhone新手，

我想在我的应用程序中实现单选按钮，我的应用程序中有三个按钮，按钮应该像单选按钮一样。

这是我的代码段，

UIButton *Btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn1.frame=CGRectMake(10, 190, 20, 20);
[Btn1 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
[Btn1 setImage:[UIImage imageNamed:@"radio-on.png"] forState:UIControlStateSelected];
[Btn1 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn1];

UIButton *Btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn2.frame=CGRectMake(10, 240, 20, 20);
[Btn2 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
[Btn2 setImage:[UIImage imageNamed:@"radio-on.png"] forState:UIControlStateSelected];
[Btn2 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn2];

UIButton *Btn3 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn3.frame=CGRectMake(10, 290, 20, 20);
[Btn3 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
[Btn3 setImage:[UIImage imageNamed:@"radio-on.png"] forState:UIControlStateSelected];
[Btn3 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn3];


- (IBAction)RadioButton:(UIButton *)button{

    for (UIButton *Radiobutton in [self.view subviews]) {
        if ([Radiobutton isKindOfClass:[UIButton class]] && ![Radiobutton isEqual:button]) {
            [Radiobutton setSelected:NO];
        }
    }
    if (!button.selected) {
        button.selected = !button.selected;
    }
}

我们将不胜感激。

Answer 1

您可以使用以下代码。

     //Add all the buttons to class level NSMutable array
        UIButton *Btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
        Btn1.frame=CGRectMake(10, 190, 20, 20);
        [Btn1 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
        [Btn1 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
        [scrollVw addSubview:Btn1];
        [self.buttonsArray addObject:Btn1];

        UIButton *Btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
        Btn2.frame=CGRectMake(10, 240, 20, 20);
        [Btn2 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
        [Btn2 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
        [scrollVw addSubview:Btn2];
        [self.buttonsArray addObject:Btn2];

        UIButton *Btn3 = [UIButton buttonWithType:UIButtonTypeCustom];
        Btn3.frame=CGRectMake(10, 290, 20, 20);
        [Btn3 setImage:[UIImage imageNamed:@"radio-off.png"] forState:UIControlStateNormal];
        [Btn3 addTarget:self action:@selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
        [scrollVw addSubview:Btn3];
        [self.buttonsArray addObject:Btn3];

 - (IBAction)RadioButton:(id)sender{

       [self resetAllButtons];
       UIButton* button=(UIButton*) sender;
       [button setImage:[UIImage imageNamed:@"radio-on.png"] forState:UIControlStateNormal];

}

 -(void) resetAllButtons{
           for(int i=0;i<[self.buttonsArray count];i++){
              UIButton* button=[self.buttonsArray objectAtIndex:i];
              [button setImage:[UIImage imageNamed:@"radio-off.png"]  forState:UIControlStateNormal];
           }
}

Answer 2

您正在检查self.view.subviews中的所有观看次数，但这些按钮实际上已添加到名为scrollVw的UIScrollView（我猜）中。

将for循环更改为

    for (UIButton *Radiobutton in [self.scrollVw subviews]) {

如果将scrollVw添加为 .h 文件中的属性。

Answer 3

是否反对使用UISegmentedControl？它的工作方式类似于单选按钮，因为它一次只能选择一个选项。如果您对单选按钮的外观不熟，我会将其子类化以更改外观。

http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UISegmentedControl_Class/Reference/UISegmentedControl.html

Answer 4

或者你可以简单地使用iOS提供的控件：

UISegmentedControl

它可以轻松处理三个段，非常灵活，可以像单选按钮一样，只能选择一个段或多个段。

无法在iPhone中实现单选按钮

4 个答案: