我已经动态创建了一些带有一些值的RadioButtons列表。以编程方式我更改了按钮状态并更改了选定和未选中的图像。但问题是我可以同时选择所有的radioButtons。实际上我需要一次选择一个。 当我点击下一个RadioButton时,之前选择的按钮状态应该更改为未选中。
这是我的代码,我尝试更改图片,但是......我的代码存在一些问题。
RadioButton = [UIButton buttonWithType:UIButtonTypeCustom];
[RadioButton setFrame:CGRectMake(0.0f, 0.0f, 20, 20)];
[RadioButton setCenter:CGPointMake(116.0,p1)];
[RadioButton setSelected:NO];
[RadioButton setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
[RadioButton addTarget:self action:@selector(RadioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.scrollView addSubview:RadioButton];
-(void)RadioButtonTapped:(id)sender
{
UIButton *RadioButton1 = (UIButton*)sender ;
[self radiobuttonAction:RadioButton1];
}
-(void)radiobuttonAction:(UIButton *)Button
{
if(![Button isSelected])
{
[Button setSelected:YES];
[Button setImage:[UIImage imageNamed:@"radio_active.png"] forState:UIControlStateSelected]; //not working, button image is not changing
}
else
{
[Button setSelected:NO];
[Button setImage:[UIImage imageNamed:@"radio_inactive.png"] forState:UIControlStateNormal];
}
}
我在哪里可以更改以前所选按钮的图像。
提前致谢
答案 0 :(得分:1)
选择一个按钮时取消选择所有按钮。如果滚动视图中有按钮,则可以使用以下代码:
//Your Method
-(void)RadioButtonTapped:(id)sender
{
UIButton *RadioButton1 = (UIButton*)sender;
[self deselectAll];
[self radiobuttonAction:RadioButton1];
}
- (void) deselectAll : (UIScrollView *) scrollView{
NSArray *viewArray = [scrollView subviews];
for (UIView *v in viewArray){
if([v isKindOfClass:[UIButton class]]){
[((UIButton *)v) setSelected:NO];
}
}
}
编辑:但是如果你想给它真正的单选按钮效果(总是选择一个,只选择一个),你会更容易。使用以下代码:
//A globle refButton
UIButton *refButton = nil;
//Set image for both state:
[RadioButton setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
[RadioButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateSelected];
//make any of above default select: may be the last one and pass that to `refButton`
refButton = RadioButton;
//Your Method
-(void)RadioButtonTapped:(id)sender
{
[refButton setSelected:NO];
refButton = (UIButton*)sender;
[refButton setSelected:YES];
}
答案 1 :(得分:0)
在创建时标记按钮。 按下按钮时,通过标签获取按钮。取消选择所有按钮。更新您作为n参数收到的当前按钮。
答案 2 :(得分:0)
假设您要添加5个单选按钮。
- (void)viewDidLoad
{
for (int i = 0; i < 5; i++) {
UIButton* RadioButton = [UIButton buttonWithType:UIButtonTypeCustom];
[RadioButton setFrame:CGRectMake(0.0f, 0.0f, 20, 20)];
[RadioButton setCenter:CGPointMake(116.0, i * 40)];
// [RadioButton setTag:i * 10];
[RadioButton setSelected:NO];
[RadioButton setImage:[UIImage imageNamed:@"unCheck.png"] forState:UIControlStateNormal];
[RadioButton addTarget:self action:@selector(RadioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.scrollView addSubview:RadioButton];
}
}
//do not forget to declared this in your header file
-(void)RadioButtonTapped:(UIButton*)button;
{
for (UIButton *btn in self.scrollView.subviews) {
[btn setImage:[UIImage imageNamed:@"unCheck.png"] forState:UIControlStateNormal];
}
[button setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
}
上面的代码更新了用户界面,将所有按钮的图像设置为“取消选中”,然后将最后按下的按钮的图像更改为“检查”。
答案 3 :(得分:-2)
创建这样的按钮,
for(int i=0;i<4;i++)
{
RadioButton = [UIButton buttonWithType:UIButtonTypeCustom];
RadioButton.tag = i*100;
[RadioButton setFrame:CGRectMake(0.0f, 0.0f, 20, 20)];
[RadioButton setCenter:CGPointMake(116.0,p1)];
[RadioButton setSelected:NO];
[RadioButton setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
[RadioButton addTarget:self action:@selector(RadioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.scrollView addSubview:RadioButton];
}
添加这样的动作,
-(void)radiobuttonAction:(UIButton *)Button
{
UIButton *Button = (UIButton*)sender;
for(UIButton * btn in self.scrollview.subViews)
{
if(btn.tag == Button.tag)
{
if(![Button isSelected])
{
[Button setSelected:YES];
[Button setImage:[UIImage imageNamed:@"radio_active.png"] forState:UIControlStateSelected]; //not working, button image is not changing
}
else
{
[Button setSelected:NO];
[Button setImage:[UIImage imageNamed:@"radio_inactive.png"] forState:UIControlStateNormal];
}
}
else
{
//do selected or de-selected code for other buttons
}
}