UIPickerView：旋转时获取行值？ [英] UIPickerView: Get row value while spinning?

问题描述

我想实时获取行值，因为iPhone用户在UIPickerView中旋转一个轮子（不仅仅是当轮子安装到特定行时）。我查看了子类化UIPickerView然后重写了mouseDown方法，但我无法使其工作。任何建议都将非常感激。

I'd like to get the row value in real-time as the iPhone user spins a wheel in a UIPickerView (not just when the wheel settles onto a particular row). I looked into subclassing UIPickerView then overriding the mouseDown method, but I couldn't get this to work. Any suggestions would be very much appreciated.

推荐答案

也许尝试实现委托方法：

Perhaps try implementing the delegate method:

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

您可以将其视为直通（只是传回reusingView参数），但每次调用它时您都会知道该视图当用户滚动时，屏幕上出现了 - 然后你可以计算从中心视图偏移的视图数量。

You could treat it as a passthrough (just passing back the reusingView parameter) but each time it was called you would know that view was coming on the screen as the user scrolled - then you could calculate how many views offset from this one the center view was.

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