ios - UIStepper - 查看它是递增还是递减

Question

确定在 UIStepper 中是否按下了加号或减号按钮我使用了这个方法:

- (void)stepperOneChanged:(UIStepper*)stepperOne

然后我将 stepperOne.value 与保存在我的 TableView 类中的全局值进行比较。
我认为这不是正确的方法。

为了澄清，我将展示我正在使用的“错误”代码:

- (void)stepperOneChanged:(UIStepper*)stepperOne
{
      BOOL PlusButtonPressed=NO;  
      if(stepperOne.value>globalValue)  
      {   
          PlusButtonPressed =YES;  
      }  
      globalValue=stepperOne.value;
    
      //do what you need to do with the PlusButtonPressed boolean
}

那么正确的做法是什么？ (无需保存全局变量)

Answer 1

---

这是识别是否单击了 UIStepper 的“+”或“-”的简单而简短的方法

---

//First You have to declare oldValue as an int (or long/float/NSInteger etc. etc.) in Header File 
//So that you can access globally to that particular implementation file

- (void)viewDidLoad
{
     [super viewDidLoad];
     oldValue=stepperObj.value;
}

- (IBAction)stepperStep:(id)sender 
{
        if (stepperObj.value>oldValue) {
             oldValue=oldValue+1;
             //Your Code You Wanted To Perform On Increment
        }
       else {
             oldValue=oldValue-1;
             //Your Code You Wanted To Perform On Decrement
        }
}