我正在使用NSTokenField和对应NSTokenFieldDelegate的将由破折号字符包围的所有文本-视为圆角标记，将所有其他文本视为纯文本。
圆形标记显示时没有周围的破折号，双击其中一个标记时，标记会以纯文本模式切换并显示破折号。
在我的NSTokenFieldDelegate实施中
tokenField(NSTokenField, shouldAdd: [Any], at: Int) -> [Any]
我正在检查给定的令牌并在必要时创建四舍五入的令牌。
在某些情况下，例如，在编辑后按回车键提交文本更改时，应用程序会崩溃（在 macOS Mojave 10.14.6 上测试）。演示项目报告了一个索引超出范围异常以及我在下面发布的堆栈跟踪以供参考。
要重现崩溃，请按照以下简单步骤操作
- 运行演示应用程序
- 在令牌字段中输入“-Dash1-.-Dash2-”
- 按回车，文字变为“
Dash1.Dash2” - 双击
Dash1然后变成“-Dash1-”并被选中 - 按回车
您可以在https://github.com/fheidenreich/token-test找到演示项目，我在这里引用了相关代码：
import Cocoa
class ViewController: NSViewController {
@IBOutlet weak var tokenField: NSTokenField!
}
class Token: Codable {
let text: String
let isRounded: Bool
init(text: String, isRounded: Bool) {
self.text = text
self.isRounded = isRounded
}
}
extension ViewController: NSTokenFieldDelegate {
func tokenField(_ tokenField: NSTokenField, displayStringForRepresentedObject representedObject: Any) -> String? {
if let token = representedObject as? Token {
if token.isRounded {
return token.text.trimmingCharacters(in: CharacterSet(charactersIn: "-")).capitalized(with: .current)
} else {
return token.text
}
}
return representedObject as? String
}
func tokenField(_ tokenField: NSTokenField, styleForRepresentedObject representedObject: Any) -> NSTokenField.TokenStyle {
if let token = representedObject as? Token {
return token.isRounded ? .rounded : .none
} else {
return .none
}
}
func tokenField(_ tokenField: NSTokenField, representedObjectForEditing editingString: String) -> Any? {
var isRounded = editingString.hasPrefix("-") && editingString.hasSuffix("-") && editingString.count > 1
if isRounded {
// We treat it only as rounded token if we find no dashes inside the editing string
let startIndex = editingString.index(after: editingString.startIndex)
let endIndex = editingString.index(before: editingString.endIndex)
let searchRange = startIndex..<endIndex
let range = editingString.rangeOfCharacter(from: CharacterSet(charactersIn: "-"), options: [], range: searchRange)
isRounded = range == nil
}
return Token(text: editingString, isRounded: isRounded)
}
func tokenField(_ tokenField: NSTokenField, editingStringForRepresentedObject representedObject: Any) -> String? {
if let token = representedObject as? Token {
return token.text
}
return representedObject as? String
}
func tokenField(_ tokenField: NSTokenField, shouldAdd tokens: [Any], at index: Int) -> [Any] {
if let tokens = tokens as? [Token] {
var added = [Any]()
for token in tokens {
if token.isRounded {
added.append(token)
continue
}
let newTokens = createTokens(token.text)
added.append(contentsOf: newTokens)
}
return added
}
return tokens
}
func createTokens(_ text: String) -> [Token] {
guard let exp = try? NSRegularExpression(pattern: "-(.+?)-", options: []) else {
return []
}
var tokens = [Token]()
var previousEndLocation = 0
let matches = exp.matches(in: text, options: [], range: NSRange(location: 0, length: text.count))
for match in matches {
let range0 = match.range(at: 0) // Range that denotes the part before the match
let range1 = match.range(at: 1) // Range that denotes the match
if previousEndLocation < range0.location {
let rangePrefix = NSRange(location: previousEndLocation, length: range0.location - previousEndLocation)
// We found some text that prefixes the matches
if rangePrefix.length > 0 {
if let swiftRange = Range(rangePrefix, in: text) {
let name = String(text[swiftRange])
tokens.append(Token(text: name, isRounded: false))
}
}
}
if let swiftRange = Range(range1, in: text) {
let name = "-" + text[swiftRange] + "-"
tokens.append(Token(text: name, isRounded: true))
}
previousEndLocation = range0.location + range0.length
}
// We found some text that postfixes the matches
if previousEndLocation < text.count {
let range = NSRange(location: previousEndLocation, length: text.count - previousEndLocation)
if let swiftRange = Range(range, in: text) {
let name = String(text[swiftRange])
tokens.append(Token(text: name, isRounded: false))
}
}
return tokens
}
}
谁能解释为什么应用程序崩溃并可能给出修复或规避问题的提示？
2019-11-23 22:05:54.155614+0100 TokenTest[52583:3146671] !!! _NSGlyphTreeGlyphAtIndex missing glyphs
2019-11-23 22:05:54.160776+0100 TokenTest[52583:3146671] [General] An uncaught exception was raised
2019-11-23 22:05:54.160940+0100 TokenTest[52583:3146671] [General] *** -[NSBigMutableString _getBlockStart:end:contentsEnd:forRange:stopAtLineSeparators:]: Range {0, 5} out of bounds; string length 0
2019-11-23 22:05:54.200975+0100 TokenTest[52583:3146671] [General] (
0 CoreFoundation 0x00007fff398e5bc9 __exceptionPreprocess + 256
1 libobjc.A.dylib 0x00007fff640893c6 objc_exception_throw + 48
2 CoreFoundation 0x00007fff398e59fb +[NSException raise:format:] + 193
3 Foundation 0x00007fff3bb23da2 -[NSString _getBlockStart:end:contentsEnd:forRange:stopAtLineSeparators:] + 214
4 Foundation 0x00007fff3bb23cc5 -[NSString getParagraphStart:end:contentsEnd:forRange:] + 31
5 UIFoundation 0x00007fff60551488 _NSFastFillAllLayoutHolesForGlyphRange + 1425
6 UIFoundation 0x00007fff6053e260 -[NSLayoutManager(NSPrivate) _firstPassGlyphRangeForBoundingRect:inTextContainer:okToFillHoles:] + 285
7 UIFoundation 0x00007fff6053d26c -[NSLayoutManager(NSPrivate) _glyphRangeForBoundingRect:inTextContainer:fast:okToFillHoles:] + 851
8 UIFoundation 0x00007fff6053cf12 -[NSLayoutManager glyphRangeForBoundingRect:inTextContainer:] + 67
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56 HIToolbox 0x00007fff38ae325a __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_4 + 250
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62 AppKit 0x00007fff378032d6 __204-[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:]_block_invoke.734 + 115
63 AppKit 0x00007fff378031c7 -[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:] + 245
64 AppKit 0x00007fff37803892 -[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:] + 1286
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66 AppKit 0x00007fff37137004 -[NSView interpretKeyEvents:] + 209
67 AppKit 0x00007fff37136e2d -[NSTextView keyDown:] + 726
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71 AppKit 0x00007fff36e105c0 -[NSApplication run] + 755
72 AppKit 0x00007fff36dffac8 NSApplicationMain + 777
73 TokenTest 0x0000000100008cad main + 13
74 libdyld.dylib 0x00007fff6584f3d5 start + 1
)