导航栏添加左右按钮方法

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导航栏按钮的控件叫BarButtonItem。关于其设置：第一种：UIImage *searchimage=[UIImage imageNamed:@"search.png"];    UIBarButtonItem *barbtn=[[UIBarButtonItem alloc] initWithImage:nil style:UIBarButtonItemStyleDone target:self action:@selector(searchprogram)];        barbtn.image=searchimage;    self.navigationItem.rightBarButtonItem=barbtn;这种设置出来的外观不好控制第二种：UIButton*rightButton = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,30,30)];    [rightButtonsetImage:[UIImageimageNamed:@"search.png"]forState:UIControlStateNormal];    [rightButtonaddTarget:selfaction:@selector(searchprogram)forControlEvents:UIControlEventTouchUpInside];   UIBarButtonItem*rightItem = [[UIBarButtonItemalloc]initWithCustomView:rightButton];    [rightButton release];   self.navigationItem.rightBarButtonItem= rightItem;    [rightItem release];这种图片将填满button，大小可控第三种：UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(methodtocall:) ]; 如何让navigationItem.rightBarButtonItem隐藏消失？self.navigationItem.rightBarButtonItem=nil；即可实现

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