UIBarButtonItem *tbarItem = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemActiontarget:selfaction:@selector(book)];

    UIBarButtonItem *tbarItem1 = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAddtarget:selfaction:nil];

    UIBarButtonItem *tbarItem3 = [[UIBarButtonItemalloc] initWithTitle:@"title"style:(UIBarButtonItemStyleDone) target:selfaction:nil];

    UIBarButtonItem *tbarItem4 = [[UIBarButtonItemalloc] initWithTitle:@"button1"style:(UIBarButtonItemStyleBordered) target:selfaction:nil];

    //设置间隔

    UIBarButtonItem *flex = [[UIBarButtonItemalloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFixedSpacetarget:selfaction:nil];

    NSArray *itemArray=

  @[tbarItem,flex,tbarItem1,flex,tbarItem3,flex,tbarItem4];

    //默认是隐藏的

    [self.navigationControllersetToolbarHidden:NOanimated:YES];

    [self setToolbarItems:itemArray];