iOS

Question

我有一个按钮，您可以按下该按钮，该按钮的文本会发生变化。我希望能够检测到用户何时再次单击按钮，以便按钮文本将变回其原始文本。我怎么能那样做？这是我目前的代码。

//Set Text and alignment for the buttons

[nocavities setTitle:@"No cavities\n5 points" forState:UIControlStateNormal];
nocavities.titleLabel.textAlignment = NSTextAlignmentCenter;

-(IBAction)nocavitiesaction:(id)sender {

[sender setTitle:@"Whenever you visit our office cavity-free, you will receive 5 points!" forState:UIControlStateNormal];
}

我觉得在 IBAction 中我应该将状态更改为

UIControlStateNormalPressed

但我不确定。

Answer 1

您可以在 IBAction

中设置一个计数器

像这样：

-(IBAction)nocavitiesaction:(id)sender {

    static int count = 0;
    count ++;
    if(count % 2 != 0){
        //Set title 1
    }else{
        //Set title 2
    }
}

Answer 2

没有UIControlStateNormalPressed状态，但是有UIControlStateSelected状态。您可以为选定状态和正常状态设置标题，然后手动将 UIButton 设置为其选定状态，如下所示：

- (void)viewDidLoad {
    [self.button setTitle:@"Whenever you visit our office cavity-free, you will receive 5 points!" forState:UIControlStateNormal];
    [self.button setTitle:@"No cavities\n5 points" forState:UIControlStateSelected];
}
- (IBAction)nocavitiesaction:(UIButton*)sender {
    sender.selected = !sender.selected;
}

注意：我已将参数从 id 更改为 UIButton，以避免必须将 id 转换为 UIButton 来检查其选定状态。 UIButton 应该是 "Custom" 类型，如果你想在选择时防止背景色调。

Answer 3

打开 xib 文件和 select 按钮。
在属性检查器下，您会从下拉列表中找到 "State Config"、select "Default"。
将按钮的标题更改为"No cavities\n5 points"
将状态配置更改为 "Selected"
将标题更改为 "Whenever you visit our office cavity-free, you will receive 5 points!"

现在切换这些标题。

- (IBAction)nocavitiesaction:(id)sender
{
    UIButton * button = sender;
    button.selected = !button.selected;
}

Answer 4

像这样。声明全局 int 标志=1;

-(IBAction)methodName:(id)sender
{
     if(flag==1)
     {
         //set title 1
          flag=2;
     }
     else
     {
        //set  title 2
        flag=1
     }

}

iOS - 如何检测按钮是否被按下两次

iOS - How to Detect if Button is Pressed Twice

objective-c

uibutton