ios 导航栏怎么添加左右按钮
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self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"LeftBarButton" style:UIBarButtonItemStylePlain target:self action:@selector(tapLeftBarButtonItem)];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"RightBarButton" style:UIBarButtonItemStylePlain target:self action:@selector(tapRightBarButtonItem)];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"RightBarButton" style:UIBarButtonItemStylePlain target:self action:@selector(tapRightBarButtonItem)];
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