Swift中的UIControlState

Question

这是我的代码：

let font = UIFont(name: "AvenirNext-Regular", size: 16.0)
let attributes: NSDictionary? = [ NSFontAttributeName : font! ]
self.segmentedControl.setTitleTextAttributes(attributes, forState:.Normal)

我有一个错误“在最后一行找不到成员'正常'。出了什么问题？

Answer 1

您需要将attributes投射到[NSObject : AnyObject]，您的代码将是：

segmentedControl.setTitleTextAttributes(attributes as [NSObject : AnyObject]?, forState: .Normal)

这是Apple Docs的默认语法：

func setTitleTextAttributes(_ attributes: [NSObject : AnyObject]?, forState state: UIControlState)

或者您可以在创建attributes时将[NSObject : AnyObject]?投射到let font = UIFont(name: "AvenirNext-Regular", size: 16.0) let attributes: [NSObject : AnyObject]? = [ NSFontAttributeName : font! ] self.segmentedControl.setTitleTextAttributes(attributes, forState: UIControlState.Normal) ，代码将为：

C

Answer 2

更改代码的以下行：

self.segmentedControl.setTitleTextAttributes(attributes, forState:.Normal)

到此：

self.segmentedControl.setTitleTextAttributes(attributes, forState: UIControlState.normal)

或者您也可以使用以下内容：

self.segmentedControl.setTitleTextAttributes(attributes as? [AnyHashable : Any], forState: UIControlState.normal)

Answer 3

它应该适用于您的代码。你只需重新启动你的xcode。

尝试打击代码：

import UIKit

class ViewController: UIViewController {

    @IBOutlet var segment: UISegmentedControl!

    override func viewDidLoad() {
        super.viewDidLoad()


        let font = UIFont(name: "AvenirNext-Regular", size: 26.0)
        let attributes: NSDictionary? = [ NSFontAttributeName : font! ]
       segment.setTitleTextAttributes(attributes! as [NSObject : AnyObject], forState:.Normal)

        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}