尝试一下

NSMutableArray *arrRightBarItems = [[NSMutableArray alloc] init];
UIButton *btnSetting = [UIButton buttonWithType:UIButtonTypeCustom];
[btnSetting setImage:[UIImage imageNamed:@"settings.png"] forState:UIControlStateNormal];
btnSetting.frame = CGRectMake(0, 0, 32, 32);
btnSetting.showsTouchWhenHighlighted=YES;
[btnSetting addTarget:self action:@selector(onSettings:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btnSetting];
[arrRightBarItems addObject:barButtonItem];

UIButton *btnLib = [UIButton buttonWithType:UIButtonTypeCustom];
[btnLib setImage:[UIImage imageNamed:@"library.png"] forState:UIControlStateNormal];
btnLib.frame = CGRectMake(0, 0, 32, 32);
btnLib.showsTouchWhenHighlighted=YES;
[btnLib addTarget:self action:@selector(onMyLibrary:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonItem2 = [[UIBarButtonItem alloc] initWithCustomView:btnLib];
[arrRightBarItems addObject:barButtonItem2];

UIButton *btnRefresh = [UIButton buttonWithType:UIButtonTypeCustom];
[btnRefresh setImage:[UIImage imageNamed:@"refresh.png"] forState:UIControlStateNormal];
btnRefresh.frame = CGRectMake(0, 0, 32, 32);
btnRefresh.showsTouchWhenHighlighted=YES;
[btnRefresh addTarget:self action:@selector(onRefreshBtn:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonItem1 = [[UIBarButtonItem alloc] initWithCustomView:btnRefresh];

[arrRightBarItems addObject:barButtonItem1];
self.navigationItem.rightBarButtonItems=arrRightBarItems;