Tot*_*mus 15
或者:
[mySegmentControl setSelectedSegmentIndex:-1];
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要么:
[mySegmentControl setSelectedSegmentIndex:UISegmentedControlNoSegment];
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这一切都在苹果文档中.参考:http://developer.apple.com/library/ios/#documentation/uikit/reference/UISegmentedControl_Class/Reference/UISegmentedControl.html