ios 如何在 UISegmentedControl 中设置选定的段索引？
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How to set selected segment index in UISegmentedControl?
提问by esqew
I'm trying to avoid an app crash here... I have a button that will remove a segment from a UISegmentedControl. If that button is pressed and the user has the segment to be removed selected, the segment will remove and no selection will be highlighted. However, when another button is pushed that does an action that retrieves the selectedSegmentIndex, the app crashes.
我正在尝试避免应用程序崩溃...我有一个按钮可以从 UISegmentedControl 中删除一个段。如果按下该按钮并且用户选择了要删除的段，则该段将被删除并且不会突出显示任何选择。但是，当按下另一个按钮执行检索 selectedSegmentIndex 的操作时，应用程序会崩溃。
In short: Is there any way to force the selection of a segment in a UISegmentedControl?
简而言之：有没有办法强制在 UISegmentedControl 中选择一个段？
editit seems as though the UISegmentedControl is returning a selectedSegmentIndex of -1 when no segment is selected... let's see what I can do from here.
编辑似乎 UISegmentedControl 在没有选择任何段时返回 -1 的 selectedSegmentIndex ......让我们看看我可以从这里做些什么。
回答by neillo
Use like this.. yourSegmentname.selectedSegmentIndex = 1;// or whichever segment you want
像这样使用.. yourSegmentname.selectedSegmentIndex = 1;// 或者你想要的任何段
回答by Kishore Kumar
This code is for swift 2.0
此代码适用于 swift 2.0
@IBOutlet weak var segmentcontroll: UISegmentedControl!
@IBAction func segmentneeded(sender: AnyObject)
{
if(segmentcontroll.selectedSegmentIndex==0)
{
self.view.backgroundColor=UIColor.purpleColor()
segmentcontroll.selectedSegmentIndex=UISegmentedControlNoSegment
}
else if(segmentcontroll.selectedSegmentIndex==1)
{
self.view.backgroundColor=UIColor.yellowColor()
segmentcontroll.selectedSegmentIndex=UISegmentedControlNoSegment
}
else
{
self.view.backgroundColor=UIColor.grayColor()
segmentcontroll.selectedSegmentIndex=UISegmentedControlNoSegment
}
}
