使用默认图标以编程方式创建导航项IOS

我想以编程方式使用默认的XCode刷新图标创建导航项“刷新”。我知道如何用下面的代码创建一个带有“Refresh”字样的字体。不过，我想有字的图标insetead“刷新”感谢提前使用默认图标以编程方式创建导航项IOS

帮助

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

来源

2016-08-16 user172902

好的问题，甚至已经问过。 – user3182143

检查我的更新答案为目标c和swift。 – user3182143

非常棒的问题。我为你的问题尝试了一个样本。我得到了解决方案，它工作正常。

你在你的代码犯的错误是

首先你

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

是wrong.You必须使用或写

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

第二你使用UIBarButtonItemStyle.Plain。如果你想刷新按钮，你必须设置UIBarButtonSystemItem.Refresh。

SWIFT

override func viewDidLoad() 
{ 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    // Create the navigation bar 
    let navigationBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.frame.size.width, 64)) // set frame here 

    //set the background color   
    navigationBar.backgroundColor = UIColor.whiteColor() 
    navigationBar.delegate = self; 

    // 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: "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

The action button is refreshed

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]; 
}

该声明的NSLog是