如何设置 UIPickerView 的当前选择
我在一个 xib 文件中有一个选择器视图，在另一个文件中有一个地图视图。用户使用选择器视图选择地图视图，然后单击按钮加载地图视图。但是，当我返回到选取器视图 xib 文件时，选取器视图将返回到默认选择。如何让picker view自动选择用户之前选择的mapView？
I have a picker View in one xib file, and a map View in another. The user selects a map view with the picker View, and the clicks a button, which loads the mapView. However, when I return to the picker View xib file, the picker View goes back to the default selection. How do I make the picker view automatically select the mapView that the user selected before?
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当您离开 XIB 时存储选择，当您返回时只需告诉它重新选择即可。
http://developer.apple.com/iphone/library/documentation/uikit/reference/UIPickerView_Class/Reference/UIPickerView.html#//apple_ref/occ/instm/UIPickerView/selectRow:inComponent:animated< /a>:
Store the selection when you hop away from the XIB, and when you come back in just tell it to reselect.
http://developer.apple.com/iphone/library/documentation/uikit/reference/UIPickerView_Class/Reference/UIPickerView.html#//apple_ref/occ/instm/UIPickerView/selectRow:inComponent:animated: