tableView delete/insert cell时注意，必须 调begin&endUpdates，否则就crash
官方参考 Table View Programming Guide for iOS
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- (void)beginUpdates;
- (void)endUpdates;
- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation: (UITableViewRowAnimation)animation;
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