CODEWITHSUNDEEP
iosiphoneuitextview
milanjansari
milanjansari

Reputation: 1549

Display html text in uitextview

How can I display HTML text in textview?

For example,

string <h1>Krupal testing <span style="font-weight:
bold;">Customer WYWO</span></h1>

Suppose text is bold so it display in textview as bold string but I want display normal text. Is this possible in the iPhone SDK?

Upvotes: 89

Views: 138957

Answers (11)

pableiros
pableiros

Reputation: 16032

For Swift 4, Swift 4.2: and Swift 5

let htmlString = """
    <html>
        <head>
            <style>
                body {
                    background-color : rgb(230, 230, 230);
                    font-family      : 'Arial';
                    text-decoration  : none;
                }
            </style>
        </head>
        <body>
            <h1>A title</h1>
            <p>A paragraph</p>
            <b>bold text</b>
        </body>
    </html>
    """

let htmlData = NSString(string: htmlString).data(using: String.Encoding.unicode.rawValue)

let options = [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html]

let attributedString = try! NSAttributedString(data: htmlData!, options: options, documentAttributes: nil)

textView.attributedText = attributedString

For Swift 3:

let htmlString = """
    <html>
        <head>
            <style>
                body {
                    background-color : rgb(230, 230, 230);
                    font-family      : 'Arial';
                    text-decoration  : none;
                }
            </style>
        </head>
        <body>
            <h1>A title</h1>
            <p>A paragraph</p>
            <b>bold text</b>
        </body>
    </html>
    """

let htmlData = NSString(string: htmlString).data(using: String.Encoding.unicode.rawValue)

let attributedString = try! NSAttributedString(data: htmlData!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)

textView.attributedText = attributedString

Upvotes: 58

David
David

Reputation: 1071

BHUPI's answer is correct, but if you would like to combine your custom font from UILabel or UITextView with HTML content, you need to correct your html a bit:

NSString *htmlString = @"<b>Bold</b><br><i>Italic</i><p> <del>Deleted</del><p>List<ul><li>Coffee</li><li type='square'>Tea</li></ul><br><a href='URL'>Link </a>";

htmlString = [htmlString stringByAppendingString:@"<style>body{font-family:'YOUR_FONT_HERE'; font-size:'SIZE';}</style>"];
/*Example:

 htmlString = [htmlString stringByAppendingString:[NSString stringWithFormat:@"<style>body{font-family: '%@'; font-size:%fpx;}</style>",_myLabel.font.fontName,_myLabel.font.pointSize]];
*/
 NSAttributedString *attributedString = [[NSAttributedString alloc]
                      initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]
                           options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
                documentAttributes: nil
                             error: nil
            ];
textView.attributedText = attributedString;

You can see the difference on the picture below: enter image description here

Upvotes: 20

HotJard
HotJard

Reputation: 4808

For some cases UIWebView is a good solution. Because:

  • it displays tables, images, other files
  • it's fast (comparing with NSAttributedString: NSHTMLTextDocumentType)
  • it's out of the box

Using NSAttributedString can lead to crashes, if html is complex or contains tables (so example)

For loading text to web view you can use the following snippet (just example):

func loadHTMLText(_ text: String?, font: UIFont) {
        let fontSize = font.pointSize * UIScreen.screens[0].scale
        let html = """
        <html><body><span style=\"font-family: \(font.fontName); font-size: \(fontSize)\; color: #112233">\(text ?? "")</span></body></html>
        """
        self.loadHTMLString(html, baseURL: nil)
    }

Upvotes: 1

Ajay Iyer
Ajay Iyer

Reputation: 61

For Swift3

    let theString = "<h1>H1 title</h1><b>Logo</b><img src='http://www.aver.com/Images/Shared/logo-color.png'><br>~end~"

    let theAttributedString = try! NSAttributedString(data: theString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!,
        options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
        documentAttributes: nil)

    UITextView_Message.attributedText = theAttributedString

Upvotes: 3

Justin
Justin

Reputation: 20609

My first response was made before iOS 7 introduced explicit support for displaying attributed strings in common controls. You may now set attributedText of UITextView to an NSAttributedString created from HTML content using:

-(id)initWithData:(NSData *)data options:(NSDictionary *)options documentAttributes:(NSDictionary **)dict error:(NSError **)error

- initWithData:options:documentAttributes:error: (Apple Doc)

Original answer, preserved for history:

Unless you use a UIWebView, your solution will rely directly on CoreText. As ElanthiraiyanS points out, some open source projects have emerged to simplify rich text rendering. I would recommend NSAttributedString-Additions-For-HTML (Edit: the project has been supplanted DTCoreText), which features classes to generate and display attributed strings from HTML.

Upvotes: 9

Bhoopi
Bhoopi

Reputation: 6593

Use following block of code for ios 7+. 

NSString *htmlString = @"<h1>Header</h1><h2>Subheader</h2><p>Some <em>text</em></p><img src='http://blogs.babble.com/famecrawler/files/2010/11/mickey_mouse-1097.jpg' width=70 height=100 />";
NSAttributedString *attributedString = [[NSAttributedString alloc]
          initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]
               options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
    documentAttributes: nil
                 error: nil
];
textView.attributedText = attributedString;

Upvotes: 240

kennytm
kennytm

Reputation: 523284

Use a UIWebView on iOS 5-.

On iOS 6+ you can use UITextView.attributedString, see https://stackoverflow.com/a/20996085 for how.

There's also an undocumented -[UITextView setContentToHTMLString:] method. Do not use this if you want to submit to AppStore.

Upvotes: 55

米米米
米米米

Reputation: 990

Answer has fitted to me that from BHUPI.

The code transfer to swift as below:

Pay attention "allowLossyConversion: false"

if you set the value to true, it will show pure text.

let theString = "<h1>H1 title</h1><b>Logo</b><img src='http://www.aver.com/Images/Shared/logo-color.png'><br>~end~"

        let theAttributedString = try! NSAttributedString(data: theString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!,
            options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
            documentAttributes: nil)

        UITextView_Message.attributedText = theAttributedString

Upvotes: 4

Albert Renshaw
Albert Renshaw

Reputation: 17892

NSDoc save the text file in a string to an html file then simultaneously load it into a webview that is in the same place as your UITextView..

Upvotes: -3

Dip Dhingani
Dip Dhingani

Reputation: 2499

You can also use one more way. Three20 library offers a method through which we can construct a styled textView. You can get the library here: http://github.com/facebook/three20/

The class TTStyledTextLabel has a method called textFromXHTML: I guess this would serve the purpose. But it would be possible in readonly mode. I don't think it will allow to write or edit HTML content.

There is also a question which can help you regarding this: HTML String content for UILabel and TextView

I hope its helpful.

Upvotes: -2

sElanthiraiyan
sElanthiraiyan

Reputation: 6268

You can have a look the OHAttributedLabel classes, I used these to overcome this kind of problem with my textField. In this they have overridden the drawRect method to obtain the required style.

https://github.com/AliSoftware/OHAttributedLabel

Upvotes: 12

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