更改uiswitch上的text
为要更改text的uiswitch建立ib连接：例如myswitch,在代码中改变文字：
((uilabel *)[[[[[[self.myswitch subviews] lastobject] subviews] objectatindex:2] subviews] objectatindex:0]).text = @foo;
((uilabel *)[[[[[[self.myswitch subviews] lastobject] subviews] objectatindex:2] subviews] objectatindex:1]).text = @bar;
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