Swift 中的 UIControlState

Posted 2023-03-10

【中文标题】Swift 中的 UIControlState

【英文标题】：UIControlState in Swift

【发布时间】：2015-06-01 11:43:11

【问题描述】：

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'。怎么了？

【参考方案1】：

您需要将attributes 转换为[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)

或者您可以在创建时将attributes 转换为[NSObject : AnyObject]?，代码代码将为：

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

【参考方案2】：

它应该适用于您的代码。您只需重新启动您的 xcode。

试试吹码：

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.
    

【参考方案3】：

更改以下代码行：

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

到这里：

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)