python - NSTextView 突出显示不触发

Question

我已经下载:NSTextView 突出显示:enter link description here

它按预期工作，如果您打开应用程序并输入符号“-”，它会变成红色，但后来我遇到了问题。我在.h文件中写入:IBOutlet NSTextView *change_text，并在.m文件中写入:

-(void)awakeFromNib {



    [text_View setString:@"-"];


}

这个想法是当应用程序打开时，它应该在屏幕上显示红色的符号“-”。它确实显示了符号:“-”，但没有突出显示它，直到我手动单击回车或空格，然后它才变成红色。我希望它将标志变成红色，而不是等待有人再次更改文本。请帮帮我

Python 脚本如下所示:

from Foundation import *
from AppKit import *

import objc

class PyObjC_HighlightAppDelegate(NSObject):

    # The connection to our NSTextView in the UI
    highlightedText = objc.IBOutlet()

    # Default font size to use when highlighting
    fontSize = 12

    def applicationDidFinishLaunching_(self, sender):
        NSLog("Application did finish launching.")

    def textDidChange_(self, notification):




        """
        Delegate method called by the NSTextView whenever the contents of the
        text view have changed. This is called after the text has changed and
        been committed to the view. See the Cocoa reference documents:

        http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSText_Class/Reference/Reference.html
        http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSTextView_Class/Reference/Reference.html

        Specifically the sections on Delegate Methods for information on additional
        delegate methods relating to text control is NSTextView objects.
        """

        # Retrieve the current contents of the document and start highlighting

        content = self.highlightedText.string()
        self.highlightText(content)

    def setAttributesForRange(self, color, font, rangeStart, rangeLength):
        """
        Set the visual attributes for a range of characters in the NSTextView. If
        values for the color and font are None, defaults will be used.

        The rangeStart is an index into the contents of the NSTextView, and
        rangeLength is used in combination with this index to create an NSRange
        structure, which is passed to the NSTextView methods for setting
        text attributes. If either of these values are None, defaults will
        be provided.

        The "font" parameter is used as an key for the "fontMap", which contains
        the associated NSFont objects for each font style.
        """
        fontMap = {
                    "normal" : NSFont.systemFontOfSize_(self.fontSize),
                    "bold" : NSFont.boldSystemFontOfSize_(self.fontSize)
                    }

        # Setup sane defaults for the color, font and range if no values
        # are provided
        if color is None:
            color = NSColor.blackColor()
        if font is None:
            font = "normal"        

        if font not in fontMap:
            font = "normal"

        displayFont = fontMap[font]

        if rangeStart is None:
            rangeStart = 0

        if rangeLength is None:
            rangeLength = len(self.highlightedText.string()) - rangeStart

        # Set the attributes for the specified character range
        range = NSRange(rangeStart, rangeLength)
        self.highlightedText.setTextColor_range_(color, range)
        self.highlightedText.setFont_range_(displayFont, range)

    def highlightText(self, content):
        """
        Apply our customized highlighting to the provided content. It is assumed that
        this content was extracted from the NSTextView.
        """

        # Calling the setAttributesForRange with no values creates
        # a default that "resets" the formatting on all of the content
        self.setAttributesForRange(None, None, None, None)

        # We'll highlight the content by breaking it down into lines, and
        # processing each line one by one. By storing how many characters
        # have been processed we can maintain an "offset" into the overall
        # content that we use to specify the range of text that is currently
        # being highlighted.
        contentLines = content.split("\n")
        highlightOffset = 0

        for line in contentLines:

            if line.strip().startswith("#"):
                # Comment - we want to highlight the whole comment line
                self.setAttributesForRange(NSColor.greenColor(), None, highlightOffset, len(line))


            elif line.find(":") > -1:
                # Tag - we only want to highlight the tag, not the colon or the remainder of the line
                startOfLine = line[0: line.find(":")]
                yamlTag = startOfLine.strip("\t ")
                yamlTagStart = line.find(yamlTag)
                self.setAttributesForRange(NSColor.blueColor(), "bold", highlightOffset + yamlTagStart, len(yamlTag))

            elif line.strip().startswith("-"):
                # List item - we only want to highlight the dash
                listIndex = line.find("-")
                self.setAttributesForRange(NSColor.redColor(), None, highlightOffset + listIndex, 1)


            # Add the processed line to our offset, as well as the newline that terminated the line
            highlightOffset += len(line) + 1

Answer 1

我认为这里的核心问题是调用 -[NSTextView setString]不发布 NSTextDidChangeNotification ，因此代码永远不会调用 textDidChange_方法。所以我认为最简单的解决方案就是在设置字符串后发布该通知。我不太了解 PyObjC，但这就是你在 Objective-C 中的做法:

[[NSNotificationCenter defaultCenter] postNotificationName:NSTextDidChangeNotification object:text_view];

我不建议调用方法 textDidChange_直接方法，就好像您(或您使用的任何库)曾经依赖于文本更改时调用的方法一样，它们需要对相同的通知使用react。