swift - 如何在 Swift 中的 TTTAttributedLabel、OHAttributedLabel 或 SETextView 上设置 "NSBackgroundColorAttributeName"

Question

我试图在 TTTAtributedLabel、OHAttributedLabel 或 SETextView 上设置 NSBackgroundColorAttributeName 属性，但它不起作用.有人知道吗？示例代码如下。

class ViewController: UIViewController {

    @IBOutlet weak var textLabel: UILabel!
    @IBOutlet weak var ttLabel: TTTAttributedLabel!
    @IBOutlet weak var ohLabel: OHAttributedLabel!
    @IBOutlet weak var seTextView: SETextView!

    override func viewDidLoad() {
        super.viewDidLoad()

        var content: String = "This is Test."
        var text = NSMutableAttributedString(string: content)
        text.addAttribute(NSBackgroundColorAttributeName, value: UIColor.redColor(), range: NSMakeRange(0, text.length))
        textLabel.attributedText = text     // It's Work.
        ohLabel.attributedText = text       // It's not Work
        seTextView.attributedText = text    // It's not Work

        // It's not Work as well
        ttLabel.setText(content, afterInheritingLabelAttributesAndConfiguringWithBlock: {
            (attributedString) -> NSMutableAttributedString! in
            attributedString.addAttribute(NSBackgroundColorAttributeName, value: UIColor.redColor(), range: NSMakeRange(0, attributedString.length))
            //attributedString.addAttribute(kTTTBackgroundFillColorAttributeName, value: UIColor.yellowColor(), range: NSMakeRange(1, 3))
            return attributedString
        })
    }
}

此外，我可以在每个标签上正确设置“NSForegroundColorAttributeName”。

Answer 1

阅读此博客 NSBackgroundcolorattributename和 NSAttributedString_Class 的 Apple 文档

使用此代码..

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var myLabel: UILabel!
    var myString:NSString = "I Love Stackoverflow!"
    var myMutableString = NSMutableAttributedString()
    @IBAction func myFontButton(sender: UIButton) {
        myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: sender.titleLabel!.text!, size: 24.0)!, range: NSRange(location: 7,length: 5))
        myLabel.attributedText = myMutableString
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        //Initialize the mutable string
        myMutableString = NSMutableAttributedString(string: myString, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 18.0)!])

        //Add more attributes here:
        myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "Chalkduster", size: 24.0)!, range: NSRange(location: 7,length: 5))
        myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "AmericanTypewriter-Bold", size: 18.0)!, range: NSRange(location:2,length:4))
        myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: NSRange(location:2,length:4))

        myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "Georgia", size: 36.0)!, range: NSRange(location: 0, length: 1))
        myMutableString.addAttribute(NSStrokeColorAttributeName, value: UIColor.blueColor(), range:  NSRange(location: 0, length: 1))
        myMutableString.addAttribute(NSStrokeWidthAttributeName, value: 2, range: NSRange(location: 0, length: 1))

        myMutableString.addAttribute(NSBackgroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location: 0, length: myString.length))
        myLabel.backgroundColor = UIColor.grayColor()

        //Apply to the label
        myLabel.attributedText = myMutableString    }

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


}