在 UIPickerView 中选择某些内容时发生某些事情 [英] Making something happen when something is selected in a UIPickerView

问题描述

我正在创建一个使用 UIPickerView 的应用程序.我做了这个视图，但我试图让某个按钮改变它的作用.请帮忙.

I was working on creating an app that uses a UIPickerView. I made the view but I am trying to make a certain button change what it does. Please help.

推荐答案

UIPickerView 和许多其他控件使用委托模式来通知您正在发生的事件.要使用它，将 添加到您的类类型定义(@interface 行)，然后将 UIPickerView 的委托设置为您的类，如下所示:

UIPickerView and many other controls use delegate pattern to inform you about events happening. To use it add <UIPickerViewDelegate> to your class type definition(@interface line) and after that set the delegate of UIPickerView to your class like this:

myUIPickerView.delegate = self;

然后可以写如下method 和 row 是你想要的索引:

Then you can write the following method in your class and row is the index you want:

- (void)pickerView:(UIPickerView *)pickerView
      didSelectRow:(NSInteger)row
       inComponent:(NSInteger)component
{
    switch(row)
    {
         //...
    }
}

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