如何在导航栏的两侧加多个Button

UIBarButtonItem *anotherButton =[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"CollectIcon"] style:UIBarButtonItemStylePlain target:self action:@selector(Like:)];

UIBarButtonItem *anotherButton2 = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"detailpage_sharebutton_up"] style:UIBarButtonItemStylePlain target:self action:@selector(dealShare:)];

UIBarButtonItem *anotherButton3 = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"TextIcon"] style:UIBarButtonItemStylePlain target:self action:@selector(changeFont:)];

[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects: anotherButton,anotherButton2,anotherButton3,nil]];