如何在 UIToolBar 中添加栏按钮

我创建了一个UIToolBar并想在其中添加三个项目，如联系人、日期和消息。我尝试过，但我无法做到这一点。请帮助我，因为我是新手Objective C。这是我的"ViewController.m"

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];
UIToolbar *toolbar = [[UIToolbar alloc] init];
toolbar.frame = CGRectMake(0, 414, self.view.frame.size.width, 44);
UIBarButtonItem *contact = [[UIBarButtonItem alloc]   initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:nil];
UIBarButtonItem *message = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:nil];

NSMutableArray *items = [[NSMutableArray alloc] initWithObjects:contact,message, nil];
[toolbar setItems:items animated:NO];
[items release];
[self.view addSubview:toolbar];
[toolbar release];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}

@end

在下面的代码中我添加了两个UIBarButton with 弹性空间..
您可以根据需要添加 UIBarButton

UIToolbar *Toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    Toolbar.barStyle = UIBarStyleBlackTranslucent;
    [Toolbar sizeToFit];

     NSMutableArray *barItems = [[NSMutableArray alloc] init];
    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    [barItems addObject:flexSpace];
    [flexSpace release];

    UIBarButtonItem *btnCancel = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(Cancel)];
    [barItems addObject:btnCancel];

    UIBarButtonItem *btnDone = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(done)];
    [barItems addObject:btnDone];

    [Toolbar setItems:barItems animated:YES];

点击栏按钮时将调用以下方法

-(void)Cancel
{
  // Write Code for Cancel Method
}

-(void)done
{
  // Write Code for Done Method
}