@property (weak, nonatomic) IBOutlet UISegmentedControl *segCtl;
获取当前选中项索引(从0开始)：segCtl.selectedSegmentIndex
获取总选项数：segCtl.numberOfSegments
移除指定索引处的segment：- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
eg：[segmentedControl removeSegmentAtIndex:0 animated:NO];
移除所有segment项：- (void)removeAllSegments;
参考文档：https://www.cnblogs.com/CJDog/p/4846068.html
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