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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