自定义导航栏的左右按钮

 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