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)

我遇到错误“在最后一行找不到成员 'Normal'。怎么了？

Answer 1

更改代码的以下行：

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

对此：

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

或者您也可以使用以下方法：

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

Answer 2

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]?，代码代码为：

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

Answer 3

您的代码应该可以正常工作。您只需重新启动 xcode.

试吹代码：

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.
    }

}

Swift 中的 UIControlState

UIControlState in Swift

uicontrolstate

swift