UITextView不显示RTF文件中的格式化文本

Question

I am making an app for iOS 9.1 (using Xcode 7.1 and Swift 2.0), which contains a UITextView for displaying formatted text from an rtf resource file. I am calling the following function in the viewDidLoad() function of the view controller to load the text:

func loadTutorialText() {
    if let rtfPath = NSBundle.mainBundle().URLForResource("TutorialText", withExtension: "rtf") {
        do {
            let attributedStringWithRtf = try NSAttributedString(URL: rtfPath, options: [NSDocumentTypeDocumentAttribute : NSRTFTextDocumentType], documentAttributes: nil)
            self.textView.attributedText = attributedStringWithRtf
        } catch {
            print("Error loading text")
        }
    }
}

When I run the app, the text from the rtf resource file is loaded but everything is displayed as plain text. Here's an example of the test rtf file I'm using:

Example Heading

text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text.

Example Heading

text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text.

Bulleted List

• Item 1
• Item 2
• Item 3

Are there some properties I need to set for the UITextView to display this properly?

Answer 1

Instead of setting the documentAttributes to nil , read them into a variable:

var d : NSDictionary? = nil
let attributedStringWithRtf = try NSAttributedString(
    URL: rtfPath, 
    options: [NSDocumentTypeDocumentAttribute : NSRTFTextDocumentType], 
    documentAttributes: &d)

EDIT Your RTF file works fine on my machine:

Literally the only code in that app is:

class ViewController: UIViewController {
    @IBOutlet weak var tv: UITextView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let rtfPath = NSBundle.mainBundle().URLForResource("TutorialText", withExtension: "rtf")!
        var d : NSDictionary? = nil
        let attributedStringWithRtf = try! NSAttributedString(
            URL: rtfPath,
            options: [NSDocumentTypeDocumentAttribute : NSRTFTextDocumentType],
            documentAttributes: &d)
        self.tv.attributedText = attributedStringWithRtf
    }
}

I would have to suggest that if that's not what you're seeing, you have other code that you have not told us about that's coming along and messing things up.

Answer 2

删除“接口”构建器中添加到Font属性中的另一个Size类的所有字体大小设置，原因将消除。

Answer 3

SWIFT 4

[NSDocumentTypeDocumentAttribute : NSRTFTextDocumentType]

don't work for me in swift 4

here is my solution:

let attributedStringWithRtf:NSAttributedString = try NSAttributedString(
                    url: rtfPath,
                    options: [.documentType: NSAttributedString.DocumentType.rtf],
                    documentAttributes: nil
                )
                self.textView.attributedText = attributedStringWithRtf