我正在为 Mac OS X 编写一个文本编辑器。我需要在 NSTextView 中显示隐藏字符(例如空格、制表符和特殊字符)。我花了很多时间寻找如何做到这一点,但到目前为止我还没有找到答案。如果有人能指出我正确的方向,我将不胜感激。
最佳答案
这是一个完全有效且干净的实现
@interface GILayoutManager : NSLayoutManager
@end
@implementation GILayoutManager
- (void)drawGlyphsForGlyphRange:(NSRange)range atPoint:(NSPoint)point {
NSTextStorage* storage = self.textStorage;
NSString* string = storage.string;
for (NSUInteger glyphIndex = range.location; glyphIndex < range.location + range.length; glyphIndex++) {
NSUInteger characterIndex = [self characterIndexForGlyphAtIndex: glyphIndex];
switch ([string characterAtIndex:characterIndex]) {
case ' ': {
NSFont* font = [storage attribute:NSFontAttributeName atIndex:characterIndex effectiveRange:NULL];
[self replaceGlyphAtIndex:glyphIndex withGlyph:[font glyphWithName:@"periodcentered"]];
break;
}
case '\n': {
NSFont* font = [storage attribute:NSFontAttributeName atIndex:characterIndex effectiveRange:NULL];
[self replaceGlyphAtIndex:glyphIndex withGlyph:[font glyphWithName:@"carriagereturn"]];
break;
}
}
}
[super drawGlyphsForGlyphRange:range atPoint:point];
}
@end
要安装,请使用:
[myTextView.textContainer replaceLayoutManager:[[GILayoutManager alloc] init]];
要查找字体字形名称,您必须转到 CoreGraphics:
CGFontRef font = CGFontCreateWithFontName(CFSTR("Menlo-Regular"));
for (size_t i = 0; i < CGFontGetNumberOfGlyphs(font); ++i) {
printf("%s\n", [CFBridgingRelease(CGFontCopyGlyphNameForGlyph(font, i)) UTF8String]);
}
关于cocoa - 在 NSTextView 中显示隐藏字符,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/300086/