iOS CoreText 通过 CTFontManagerRegisterGraphicsFont 获取注册字体列表
iOS CoreText get list of registered fonts via CTFontManagerRegisterGraphicsFont
我正在通过以下方式动态注册字体：
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
if ([url isFileURL])
{
// Handle file being passed in
NSLog(@"handleOpenURL: %@",url.absoluteString);
NSData *inData = [NSData dataWithContentsOfURL:url];
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef fontRef = CGFontCreateWithDataProvider(provider);
UIFont *font;
if (!CTFontManagerRegisterGraphicsFont(fontRef, &error)) {
CFStringRef errorDescription = CFErrorCopyDescription(error);
NSLog(@"Failed to load font: %@", error);
CFRelease(errorDescription);
} else {
CFStringRef fontNameRef = CGFontCopyPostScriptName(fontRef);
NSLog(@"fontNameRef: %@",fontNameRef);
font = [UIFont fontWithName:(__bridge NSString *)fontNameRef size:80];
[self.arrayOfFonts addObject:(__bridge NSString *)fontNameRef];
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshFont" object:nil];
CFRelease(fontNameRef);
}
CFRelease(fontRef);
CFRelease(provider);
return YES;
}
else
{
return NO;
}
}
第一次运行良好。看来，如果我关闭应用程序并尝试再次注册相同的字体，那么它会给我（预期的）错误 "Failed to load font: Error Domain=com.apple.CoreText.CTFontManagerErrorDomain Code=105 "Could not register the CGFont '<CGFont (0x1c00f5980): NeuropolXRg-Regular>'" UserInfo={NSDescription=Could not register the CGFont '<CGFont (0x1c00f5980): NeuropolXRg-Regular>', CTFailedCGFont=<CGFont (0x1c00f5980): NeuropolXRg-Regular>}"
这似乎是因为该字体已被注册。 CTFontManagerRegisterGraphicsFont 的文档指出它：
"Registers the specified graphics font with the font manager. Registered fonts are discoverable through font descriptor matching. Attempts to register a font that is either already registered or contains the same PostScript name of an already registered font will fail."
具体怎么做"through font descriptor matching"??
如何获取已通过 CTFontManagerRegisterGraphicsFont 方法注册的所有字体的列表，以便在再次注册之前取消注册它们？
编辑：
我已经尝试使用 CTFontManagerCopyAvailablePostScriptNames 和 CTFontManagerCopyAvailableFontFamilyNames 方法，但两者都只打印出 iOS 上已经可用的字体名称。不是我通过 CTFontManagerRegisterGraphicsFont
注册的那些
注意： 我不是在询问 iOS 上已经可用的字体，这些字体可以通过遍历 [UIFont familyNames] 列出。
你应该使用的是这样的：
- (void)getInstalledFonts {
NSDictionary *descriptorOptions = @{(id)kCTFontDownloadableAttribute : @YES};
CTFontDescriptorRef descriptor = CTFontDescriptorCreateWithAttributes((CFDictionaryRef)descriptorOptions);
CFArrayRef fontDescriptors = CTFontDescriptorCreateMatchingFontDescriptors(descriptor, NULL);
[self showExistingFonts:(NSArray *)CFBridgingRelease(fontDescriptors)];
CFRelease(descriptor);
}
- (void)showExistingFonts:(NSArray *)fontList {
NSMutableDictionary *fontFamilies = [NSMutableDictionary new];
for(UIFontDescriptor *descriptor in fontList) {
NSString *fontFamilyName = [descriptor objectForKey:UIFontDescriptorFamilyAttribute];
NSMutableArray *fontDescriptors = [fontFamilies objectForKey:fontFamilyName];
if(!fontDescriptors) {
fontDescriptors = [NSMutableArray new];
[fontFamilies setObject:fontDescriptors forKey:fontFamilyName];
}
[fontDescriptors addObject:descriptor];
}
}
取自：
https://www.shinobicontrols.com/blog/ios7-day-by-day-day-22-downloadable-fonts
我向 Apple DTS（开发者技术支持）提交了一张票，他们说：
"You need to keep track of the fonts you have registered using CTFontManagerRegisterGraphicsFont yourself. The error code kCTFontManagerErrorAlreadyRegistered returned by CTFontManagerRegisterGraphicsFont will tell you if you have already registered a font. Using font descriptor matching to discover if your fonts are installed probably isn’t a good way to go as the system may choose to perform font substitution for missing fonts. Installing a font using CTFontManagerRegisterGraphicsFont simply makes it available for your app’s use. It is not a query service for discovering installed fonts. If that is not sufficient for your preferences, then I think it would be a good idea for you to consider filing a feature request asking for the functionality you would like to receive."
所以基本上，我们需要跟踪我们自己注册的字体。
Solution/Work-around 我最终使用了：
目前，我的应用程序允许用户使用字体文件上的 Action Sheet's "Copy to MYAPP" 按钮添加字体。同样的解决方案也适用于我从服务器下载的字体文件。
为了让我的应用在 .ttf 和 .otf 文件的操作 Sheet 中列出，在我的应用的 info.plist 中，我添加了一个新的文档类型:
<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeIconFiles</key>
<array/>
<key>CFBundleTypeName</key>
<string>Font</string>
<key>LSItemContentTypes</key>
<array>
<string>public.opentype-font</string>
<string>public.truetype-ttf-font</string>
</array>
</dict>
</array>
这允许我的应用程序显示在任何字体文件的 action sheet 中。因此用户可以将字体文件放在 dropbox、google 驱动器或任何其他文件共享应用程序中。然后他们可以从那里将字体导入我的应用程序。导入后，我需要将字体文件从临时 tmp inbox 文件夹移动到我应用程序的 Documents fonts 目录。 fonts 目录保留所有自定义字体。之后，我注册了这个自定义字体并将名称添加到 self.arrayOfFonts 数组中。这是包含我所有字体列表的数组。
而且 CTFontManagerRegisterGraphicsFont 似乎仅适用于会话。因此，当应用程序从 App Switcher 关闭并重新启动时，该字体将不再注册。所以每次启动后，我都会浏览我的 documents/fonts 文件夹并重新注册所有字体并将它们的名称添加到 self.arrayOfFonts 数组中。
我的应用代码的其余部分使它正常工作：
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
if ([url isFileURL])
{
// Handle file being passed in
NSLog(@"handleOpenURL: %@, extension: %@",url.absoluteString,url.pathExtension);
[self moveFontFrom:url];
return YES;
}
else
{
return NO;
}
}
-(void)moveFontFrom:(NSURL*)fromurl{
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0] stringByAppendingPathComponent:@"fonts"];
// New Folder is your folder name
NSError *error1 = nil;
if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath]){
[[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error1];
}
NSLog(@"error1: %@", error1.debugDescription);
NSURL *tourl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@",stringPath,[[fromurl absoluteString] lastPathComponent]] isDirectory:NO];
NSLog(@"Trying to move from:\n\n%@\n\nto:\n\n%@\n\n", fromurl.absoluteString,tourl.absoluteString);
NSError* error2;
if ([[NSFileManager defaultManager] fileExistsAtPath:tourl.path]){
[[NSFileManager defaultManager] removeItemAtPath:tourl.path error:&error2];
NSLog(@"Deleting old existing file at %@ error2: %@", tourl.path,error2.debugDescription);
}
NSError* error3;
[[NSFileManager defaultManager] moveItemAtURL:fromurl toURL:tourl error:&error3];
NSLog(@"error3: %@", error3.debugDescription);
if (!error3) {
NSString *fontName = [self registerFont:tourl checkIfNotify:YES];
if (fontName) {
if (![self.arrayOfFonts containsObject:fontName]) {
[self.arrayOfFonts addObject:fontName];
[self.arrayOfFonts sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshFont" object:nil userInfo:@{@"font":fontName}];
}
}
}
}
-(void)startupLoadFontsInDocuments{
self.arrayOfFonts = [NSMutableArray new];
NSString *location = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0] stringByAppendingPathComponent:@"fonts"];
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:location error:NULL];
for (NSInteger count = 0; count < [directoryContent count]; count++)
{
NSLog(@"File %ld: %@/%@", (count + 1), location,[directoryContent objectAtIndex:count]);
NSString *fontName = [self registerFont:[NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@",location,[directoryContent objectAtIndex:count]] isDirectory:NO] checkIfNotify:NO];
if (fontName) {
if (![self.arrayOfFonts containsObject:fontName]) {
[self.arrayOfFonts addObject:fontName];
}
}
}
[self.arrayOfFonts sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
}
-(NSString*)registerFont:(NSURL *)url checkIfNotify:(BOOL)checkIfNotify{
NSData *inData = [NSData dataWithContentsOfURL:url];
CFErrorRef registererror;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef fontRef = CGFontCreateWithDataProvider(provider);
NSString *fontName = (__bridge NSString *)CGFontCopyPostScriptName(fontRef);
BOOL registerFontStatus = CTFontManagerRegisterGraphicsFont(fontRef, ®istererror);
if (!registerFontStatus) {
CFStringRef errorDescription = CFErrorCopyDescription(registererror);
NSError *registererr = (__bridge NSError*)registererror;
if ([registererr code]==kCTFontManagerErrorAlreadyRegistered) {
NSLog(@"Font is already registered!");
}
NSLog(@"Failed to load font: %@", registererror);
CFRelease(errorDescription);
/*CFErrorRef unregistererror;
BOOL unregisterFont = CTFontManagerUnregisterGraphicsFont(fontRef, &unregistererror);
NSLog(@"Font unregister status: %d",unregisterFont);
CFStringRef unregistererrorDescription = CFErrorCopyDescription(unregistererror);
NSError *unregistererr = (__bridge NSError*)unregistererror;
NSInteger code = [unregistererr code];
NSLog(@"Failed to unregister font: %@", unregistererr);
CFRelease(unregistererrorDescription);*/
if (checkIfNotify) {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Already added" message:@"That font is already added to the app. Please select it from the fonts list." preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}]];
[[self.window rootViewController] presentViewController:alert animated:YES completion:nil];
}
} else {
CFStringRef fontNameRef = CGFontCopyPostScriptName(fontRef);
fontName = (__bridge NSString*)fontNameRef;
CFRelease(fontNameRef);
NSLog(@"fontName: %@",fontName);
}
CFRelease(fontRef);
CFRelease(provider);
return fontName;
}
注意： 如您所见，我已经注释掉了 CTFontManagerUnregisterGraphicsFont。用于取消注册字体的 CTFontManagerUnregisterGraphicsFont 似乎对我不起作用，因为它给出了一个错误，指出字体正在使用中，因此无法取消注册。因此，当我需要删除字体时，我只需将其从 self.arrayOfFonts 数组和我的 documents/fonts 文件夹中删除即可。
我发现，如果您曾经将 UIFont(name:) 与您动态加载的字体一起使用。 CTFontManagerUnregisterFontsForURL 不能如上所述工作。
所以解决方法是使用
let desc = UIFontDescriptor(name: <name>, size: <size>)
let font = UIFont(descriptor: desc, size: <size>)
如果您在任何时候使用 UIFont(name: )，注销并不会真正注销它。
不 我发现 CTFontManager Register/Unregstier FontsForURL api 和 GraphicsFont apis.
就是这种情况
我正在通过以下方式动态注册字体：
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
if ([url isFileURL])
{
// Handle file being passed in
NSLog(@"handleOpenURL: %@",url.absoluteString);
NSData *inData = [NSData dataWithContentsOfURL:url];
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef fontRef = CGFontCreateWithDataProvider(provider);
UIFont *font;
if (!CTFontManagerRegisterGraphicsFont(fontRef, &error)) {
CFStringRef errorDescription = CFErrorCopyDescription(error);
NSLog(@"Failed to load font: %@", error);
CFRelease(errorDescription);
} else {
CFStringRef fontNameRef = CGFontCopyPostScriptName(fontRef);
NSLog(@"fontNameRef: %@",fontNameRef);
font = [UIFont fontWithName:(__bridge NSString *)fontNameRef size:80];
[self.arrayOfFonts addObject:(__bridge NSString *)fontNameRef];
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshFont" object:nil];
CFRelease(fontNameRef);
}
CFRelease(fontRef);
CFRelease(provider);
return YES;
}
else
{
return NO;
}
}
第一次运行良好。看来，如果我关闭应用程序并尝试再次注册相同的字体，那么它会给我（预期的）错误 "Failed to load font: Error Domain=com.apple.CoreText.CTFontManagerErrorDomain Code=105 "Could not register the CGFont '<CGFont (0x1c00f5980): NeuropolXRg-Regular>'" UserInfo={NSDescription=Could not register the CGFont '<CGFont (0x1c00f5980): NeuropolXRg-Regular>', CTFailedCGFont=<CGFont (0x1c00f5980): NeuropolXRg-Regular>}"
这似乎是因为该字体已被注册。 CTFontManagerRegisterGraphicsFont 的文档指出它：
"Registers the specified graphics font with the font manager. Registered fonts are discoverable through font descriptor matching. Attempts to register a font that is either already registered or contains the same PostScript name of an already registered font will fail."
具体怎么做"through font descriptor matching"??
如何获取已通过 CTFontManagerRegisterGraphicsFont 方法注册的所有字体的列表，以便在再次注册之前取消注册它们？
编辑：
我已经尝试使用 CTFontManagerCopyAvailablePostScriptNames 和 CTFontManagerCopyAvailableFontFamilyNames 方法，但两者都只打印出 iOS 上已经可用的字体名称。不是我通过 CTFontManagerRegisterGraphicsFont
注意： 我不是在询问 iOS 上已经可用的字体，这些字体可以通过遍历 [UIFont familyNames] 列出。
你应该使用的是这样的：
- (void)getInstalledFonts {
NSDictionary *descriptorOptions = @{(id)kCTFontDownloadableAttribute : @YES};
CTFontDescriptorRef descriptor = CTFontDescriptorCreateWithAttributes((CFDictionaryRef)descriptorOptions);
CFArrayRef fontDescriptors = CTFontDescriptorCreateMatchingFontDescriptors(descriptor, NULL);
[self showExistingFonts:(NSArray *)CFBridgingRelease(fontDescriptors)];
CFRelease(descriptor);
}
- (void)showExistingFonts:(NSArray *)fontList {
NSMutableDictionary *fontFamilies = [NSMutableDictionary new];
for(UIFontDescriptor *descriptor in fontList) {
NSString *fontFamilyName = [descriptor objectForKey:UIFontDescriptorFamilyAttribute];
NSMutableArray *fontDescriptors = [fontFamilies objectForKey:fontFamilyName];
if(!fontDescriptors) {
fontDescriptors = [NSMutableArray new];
[fontFamilies setObject:fontDescriptors forKey:fontFamilyName];
}
[fontDescriptors addObject:descriptor];
}
}
取自： https://www.shinobicontrols.com/blog/ios7-day-by-day-day-22-downloadable-fonts
我向 Apple DTS（开发者技术支持）提交了一张票，他们说：
"You need to keep track of the fonts you have registered using CTFontManagerRegisterGraphicsFont yourself. The error code kCTFontManagerErrorAlreadyRegistered returned by CTFontManagerRegisterGraphicsFont will tell you if you have already registered a font. Using font descriptor matching to discover if your fonts are installed probably isn’t a good way to go as the system may choose to perform font substitution for missing fonts. Installing a font using CTFontManagerRegisterGraphicsFont simply makes it available for your app’s use. It is not a query service for discovering installed fonts. If that is not sufficient for your preferences, then I think it would be a good idea for you to consider filing a feature request asking for the functionality you would like to receive."
所以基本上，我们需要跟踪我们自己注册的字体。
Solution/Work-around 我最终使用了：
目前，我的应用程序允许用户使用字体文件上的 Action Sheet's "Copy to MYAPP" 按钮添加字体。同样的解决方案也适用于我从服务器下载的字体文件。
为了让我的应用在 .ttf 和 .otf 文件的操作 Sheet 中列出，在我的应用的 info.plist 中，我添加了一个新的文档类型:
<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeIconFiles</key>
<array/>
<key>CFBundleTypeName</key>
<string>Font</string>
<key>LSItemContentTypes</key>
<array>
<string>public.opentype-font</string>
<string>public.truetype-ttf-font</string>
</array>
</dict>
</array>
这允许我的应用程序显示在任何字体文件的 action sheet 中。因此用户可以将字体文件放在 dropbox、google 驱动器或任何其他文件共享应用程序中。然后他们可以从那里将字体导入我的应用程序。导入后，我需要将字体文件从临时 tmp inbox 文件夹移动到我应用程序的 Documents fonts 目录。 fonts 目录保留所有自定义字体。之后，我注册了这个自定义字体并将名称添加到 self.arrayOfFonts 数组中。这是包含我所有字体列表的数组。
而且 CTFontManagerRegisterGraphicsFont 似乎仅适用于会话。因此，当应用程序从 App Switcher 关闭并重新启动时，该字体将不再注册。所以每次启动后，我都会浏览我的 documents/fonts 文件夹并重新注册所有字体并将它们的名称添加到 self.arrayOfFonts 数组中。
我的应用代码的其余部分使它正常工作：
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
if ([url isFileURL])
{
// Handle file being passed in
NSLog(@"handleOpenURL: %@, extension: %@",url.absoluteString,url.pathExtension);
[self moveFontFrom:url];
return YES;
}
else
{
return NO;
}
}
-(void)moveFontFrom:(NSURL*)fromurl{
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0] stringByAppendingPathComponent:@"fonts"];
// New Folder is your folder name
NSError *error1 = nil;
if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath]){
[[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error1];
}
NSLog(@"error1: %@", error1.debugDescription);
NSURL *tourl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@",stringPath,[[fromurl absoluteString] lastPathComponent]] isDirectory:NO];
NSLog(@"Trying to move from:\n\n%@\n\nto:\n\n%@\n\n", fromurl.absoluteString,tourl.absoluteString);
NSError* error2;
if ([[NSFileManager defaultManager] fileExistsAtPath:tourl.path]){
[[NSFileManager defaultManager] removeItemAtPath:tourl.path error:&error2];
NSLog(@"Deleting old existing file at %@ error2: %@", tourl.path,error2.debugDescription);
}
NSError* error3;
[[NSFileManager defaultManager] moveItemAtURL:fromurl toURL:tourl error:&error3];
NSLog(@"error3: %@", error3.debugDescription);
if (!error3) {
NSString *fontName = [self registerFont:tourl checkIfNotify:YES];
if (fontName) {
if (![self.arrayOfFonts containsObject:fontName]) {
[self.arrayOfFonts addObject:fontName];
[self.arrayOfFonts sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshFont" object:nil userInfo:@{@"font":fontName}];
}
}
}
}
-(void)startupLoadFontsInDocuments{
self.arrayOfFonts = [NSMutableArray new];
NSString *location = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0] stringByAppendingPathComponent:@"fonts"];
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:location error:NULL];
for (NSInteger count = 0; count < [directoryContent count]; count++)
{
NSLog(@"File %ld: %@/%@", (count + 1), location,[directoryContent objectAtIndex:count]);
NSString *fontName = [self registerFont:[NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@",location,[directoryContent objectAtIndex:count]] isDirectory:NO] checkIfNotify:NO];
if (fontName) {
if (![self.arrayOfFonts containsObject:fontName]) {
[self.arrayOfFonts addObject:fontName];
}
}
}
[self.arrayOfFonts sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
}
-(NSString*)registerFont:(NSURL *)url checkIfNotify:(BOOL)checkIfNotify{
NSData *inData = [NSData dataWithContentsOfURL:url];
CFErrorRef registererror;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef fontRef = CGFontCreateWithDataProvider(provider);
NSString *fontName = (__bridge NSString *)CGFontCopyPostScriptName(fontRef);
BOOL registerFontStatus = CTFontManagerRegisterGraphicsFont(fontRef, ®istererror);
if (!registerFontStatus) {
CFStringRef errorDescription = CFErrorCopyDescription(registererror);
NSError *registererr = (__bridge NSError*)registererror;
if ([registererr code]==kCTFontManagerErrorAlreadyRegistered) {
NSLog(@"Font is already registered!");
}
NSLog(@"Failed to load font: %@", registererror);
CFRelease(errorDescription);
/*CFErrorRef unregistererror;
BOOL unregisterFont = CTFontManagerUnregisterGraphicsFont(fontRef, &unregistererror);
NSLog(@"Font unregister status: %d",unregisterFont);
CFStringRef unregistererrorDescription = CFErrorCopyDescription(unregistererror);
NSError *unregistererr = (__bridge NSError*)unregistererror;
NSInteger code = [unregistererr code];
NSLog(@"Failed to unregister font: %@", unregistererr);
CFRelease(unregistererrorDescription);*/
if (checkIfNotify) {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Already added" message:@"That font is already added to the app. Please select it from the fonts list." preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}]];
[[self.window rootViewController] presentViewController:alert animated:YES completion:nil];
}
} else {
CFStringRef fontNameRef = CGFontCopyPostScriptName(fontRef);
fontName = (__bridge NSString*)fontNameRef;
CFRelease(fontNameRef);
NSLog(@"fontName: %@",fontName);
}
CFRelease(fontRef);
CFRelease(provider);
return fontName;
}
注意： 如您所见，我已经注释掉了 CTFontManagerUnregisterGraphicsFont。用于取消注册字体的 CTFontManagerUnregisterGraphicsFont 似乎对我不起作用，因为它给出了一个错误，指出字体正在使用中，因此无法取消注册。因此，当我需要删除字体时，我只需将其从 self.arrayOfFonts 数组和我的 documents/fonts 文件夹中删除即可。
我发现，如果您曾经将 UIFont(name:) 与您动态加载的字体一起使用。 CTFontManagerUnregisterFontsForURL 不能如上所述工作。
所以解决方法是使用
let desc = UIFontDescriptor(name: <name>, size: <size>)
let font = UIFont(descriptor: desc, size: <size>)
如果您在任何时候使用 UIFont(name: )，注销并不会真正注销它。
不 我发现 CTFontManager Register/Unregstier FontsForURL api 和 GraphicsFont apis.
就是这种情况