Ios 以编程方式创建带有默认图标的导航项

我想以编程方式创建一个带有默认XCode刷新图标的导航项“刷新”。我知道如何用下面的代码创建一个带有单词“Refresh”的。不过，我想在图标中插入“刷新”一词，感谢您的帮助

    let refreshButton = UIBarButtonItem(title: "Refresh", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(FollowVC.refresh))

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您应该使用

.Refresh

，而不是使用

.Plain

let refreshButton=UIBarButtonItem（barButtonSystemItem:.Refresh，target:self，action:#选择器（FollowVC.Refresh））

---

您还应该使用

init（barButtonSystemItem:target:action:）

而不是

init（title:style:target:action:）

<

您在编码中犯的错误是

首先你

let refreshButton = UIBarButtonItem(title: "Refresh", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(FollowVC.refresh)) 

是错误的。你必须使用或书写

UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem, target: AnyObject?, action:Selector)

第二次使用的是UIBarButtonItemStyle.Plain。如果需要刷新按钮，则必须设置UIBarButtonSystemItem.refresh

SWIFT

override func viewDidLoad()
{
    // Create the navigation bar
    let navigationBar = UINavigationBar(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: CGSize(width: self.view.frame.size.width, height: 64))) // set frame here

    //set the background color
    navigationBar.backgroundColor = UIColor.white
    navigationBar.delegate = self as? UINavigationBarDelegate;

    // Create a navigation item with a title
    let navigationItem = UINavigationItem()
    navigationItem.title = "title" //If you want to set a tilte set here.Whatever you want set here.

    // Create  button for navigation item with refresh
    let refreshButton =  UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.refresh, target: self, action: Selector(("actionRefresh:")))


    // I set refreshButton for the navigation item
    navigationItem.leftBarButtonItem = refreshButton


    // Assign the navigation item to the navigation bar
    navigationBar.items = [navigationItem]

    // Make the navigation bar a subview of the current view controller
    self.view.addSubview(navigationBar)

}

#pragma action method

func actionRefresh(sender: UIBarButtonItem) 
{
  print("The action button is refreshed")
}

打印语句是

The action button is refreshed

The button action refresh is performed

目标C

- (void)viewDidLoad 
{
   [super viewDidLoad];
   // Do any additional setup after loading the view, typically from a nib.
   UINavigationBar *navbar = [[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 64)];

   navbar.backgroundColor = [UIColor whiteColor];   

   navbar.delegate = self;
   UINavigationItem * navItem = [[UINavigationItem alloc] init];

   navItem.title = @"Title";  //Set Title Here Wahtever You Want Here
   UIBarButtonItem *buttonRefresh = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
                           target:self
                           action:@selector(actionRefresh:)];

   navItem.leftBarButtonItem = buttonRefresh;
   navbar.items = @[navItem];
   [self.view addSubview:navbar];
 }

NSLog语句是

The action button is refreshed

The button action refresh is performed

请参见屏幕截图中的刷新按钮

好的解决方案

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即使已经问了一个很好的问题。请检查我更新的目标c和swift答案。非常感谢兄弟