UITextView – 无法在文本上设置下划线或删除线属性?
UITextView – can't set underline or strikethrough attributes on text?
每当我尝试在 UITextView 的 attributedText 上设置下划线或删除线属性时,我都会遇到运行时错误。其他属性,如字体和背景颜色没有问题。这是一个代码片段。我所拥有的只是一个带有单个 UITextView 的测试项目。我在 iOS 11.
class ViewController: UIViewController {
@IBOutlet weak var myTextView: UITextView!
var myMutableString = NSMutableAttributedString(string: "")
override func viewDidLoad() {
super.viewDidLoad()
let string = "The cow jumped over the moon" as NSString
myMutableString = NSMutableAttributedString(string: string as String)
let underlineAttribute = [NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle]
myMutableString.addAttributes(underlineAttribute, range: string.range(of: "cow"))
myTextView.attributedText = myMutableString
}
}
这会导致文本消失并打印出一些错误:
2017-11-05 19:43:34.708830-0800 UITextView_Test[11771:907014]
-[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 2017-11-05 19:43:34.709351-0800 UITextView_Test[11771:907014] <NSATSTypesetter: 0x60800016be80>: Exception -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 raised during typesetting layout manager <NSLayoutManager: 0x6080001fe400>
1 containers, text backing has 28 characters
Currently holding 28 glyphs.
Glyph tree contents: 28 characters, 28 glyphs, 1 nodes, 64 node bytes, 64 storage bytes, 128 total bytes, 4.57 bytes per character,
4.57 bytes per glyph
Layout tree contents: 28 characters, 28 glyphs, 0 laid glyphs, 0 laid line fragments, 1 nodes, 64 node bytes, 0 storage bytes, 64 total bytes, 2.29 bytes per character, 2.29 bytes per glyph, 0.00 laid glyphs per laid line fragment, 0.00 bytes per laid line fragment , glyph range {0 28}. Ignoring... 2017-11-05 19:43:34.709827-0800 UITextView_Test[11771:907014] -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 2017-11-05 19:43:34.710014-0800 UITextView_Test[11771:907014] <NSATSTypesetter: 0x60800016be80>: Exception -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 raised during typesetting layout manager <NSLayoutManager: 0x6080001fe400>
1 containers, text backing has 28 characters
Currently holding 28 glyphs.
Glyph tree contents: 28 characters, 28 glyphs, 1 nodes, 64 node bytes, 64 storage bytes, 128 total bytes, 4.57 bytes per character,
4.57 bytes per glyph
Layout tree contents: 28 characters, 28 glyphs, 0 laid glyphs, 0 laid line fragments, 1 nodes, 64 node bytes, 0 storage bytes, 64 total bytes, 2.29 bytes per character, 2.29 bytes per glyph, 0.00 laid glyphs per laid line fragment, 0.00 bytes per laid line fragment , glyph range {0 28}. Ignoring...
您的下划线样式无效。更改此行:
let underlineAttribute =
[NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle]
对此:
let underlineAttribute =
[NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle.rawValue]
结果:
每当我尝试在 UITextView 的 attributedText 上设置下划线或删除线属性时,我都会遇到运行时错误。其他属性,如字体和背景颜色没有问题。这是一个代码片段。我所拥有的只是一个带有单个 UITextView 的测试项目。我在 iOS 11.
class ViewController: UIViewController {
@IBOutlet weak var myTextView: UITextView!
var myMutableString = NSMutableAttributedString(string: "")
override func viewDidLoad() {
super.viewDidLoad()
let string = "The cow jumped over the moon" as NSString
myMutableString = NSMutableAttributedString(string: string as String)
let underlineAttribute = [NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle]
myMutableString.addAttributes(underlineAttribute, range: string.range(of: "cow"))
myTextView.attributedText = myMutableString
}
}
这会导致文本消失并打印出一些错误:
2017-11-05 19:43:34.708830-0800 UITextView_Test[11771:907014]
-[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 2017-11-05 19:43:34.709351-0800 UITextView_Test[11771:907014] <NSATSTypesetter: 0x60800016be80>: Exception -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 raised during typesetting layout manager <NSLayoutManager: 0x6080001fe400>
1 containers, text backing has 28 characters
Currently holding 28 glyphs.
Glyph tree contents: 28 characters, 28 glyphs, 1 nodes, 64 node bytes, 64 storage bytes, 128 total bytes, 4.57 bytes per character,
4.57 bytes per glyph
Layout tree contents: 28 characters, 28 glyphs, 0 laid glyphs, 0 laid line fragments, 1 nodes, 64 node bytes, 0 storage bytes, 64 total bytes, 2.29 bytes per character, 2.29 bytes per glyph, 0.00 laid glyphs per laid line fragment, 0.00 bytes per laid line fragment , glyph range {0 28}. Ignoring... 2017-11-05 19:43:34.709827-0800 UITextView_Test[11771:907014] -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 2017-11-05 19:43:34.710014-0800 UITextView_Test[11771:907014] <NSATSTypesetter: 0x60800016be80>: Exception -[_SwiftValue _getValue:forType:]: unrecognized selector sent to instance 0x60c00004eb50 raised during typesetting layout manager <NSLayoutManager: 0x6080001fe400>
1 containers, text backing has 28 characters
Currently holding 28 glyphs.
Glyph tree contents: 28 characters, 28 glyphs, 1 nodes, 64 node bytes, 64 storage bytes, 128 total bytes, 4.57 bytes per character,
4.57 bytes per glyph
Layout tree contents: 28 characters, 28 glyphs, 0 laid glyphs, 0 laid line fragments, 1 nodes, 64 node bytes, 0 storage bytes, 64 total bytes, 2.29 bytes per character, 2.29 bytes per glyph, 0.00 laid glyphs per laid line fragment, 0.00 bytes per laid line fragment , glyph range {0 28}. Ignoring...
您的下划线样式无效。更改此行:
let underlineAttribute =
[NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle]
对此:
let underlineAttribute =
[NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle.rawValue]
结果: