[英]How to dynamically load a font under iOS. (for real)
我已經看過這個問題並且多次回答,但我沒有看到真正的答案。 常見的“解決方案”是:
所以問題是: 如何在iOS下動態加載字體? “動態”加載字體意味着加載在應用程序編譯時未知的任何給定字體。
可以從任何位置或任何字節流輕松地動態加載字體。 請參閱此處的文章: http : //www.marco.org/2012/12/21/ios-dynamic-font-loading
NSData *inData = /* your font-file data */;
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef font = CGFontCreateWithDataProvider(provider);
if (! CTFontManagerRegisterGraphicsFont(font, &error)) {
CFStringRef errorDescription = CFErrorCopyDescription(error)
NSLog(@"Failed to load font: %@", errorDescription);
CFRelease(errorDescription);
}
CFRelease(font);
CFRelease(provider);
另請參閱: https : //developer.apple.com/library/mac/#documentation/Carbon/Reference/CoreText_FontManager_Ref/Reference/reference.html#//apple_ref/doc/uid/TP40008278
Marco最近發表的一篇名為“ 動態加載iOS字體”的文章 。
NSData *inData = /* your decrypted font-file data */;
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef font = CGFontCreateWithDataProvider(provider);
if (! CTFontManagerRegisterGraphicsFont(font, &error)) {
CFStringRef errorDescription = CFErrorCopyDescription(error)
NSLog(@"Failed to load font: %@", errorDescription);
CFRelease(errorDescription);
}
CFRelease(font);
CFRelease(provider);
// Note : add "CoreText.framework" into your project to support following code
// Put loadCustomFont function inside app delegate or any shared class to access any where in code...
-(void)loadCustomFont:(NSMutableArray *)customFontFilePaths{
for(NSString *fontFilePath in customFontFilePaths){
if([[NSFileManager defaultManager] fileExistsAtPath:fontFilePath]){
NSData *inData = [NSData dataWithContentsOfFile:fontFilePath];
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)inData);
CGFontRef font = CGFontCreateWithDataProvider(provider);
// NSString *fontName = (__bridge NSString *)CGFontCopyFullName(font);
if (!CTFontManagerRegisterGraphicsFont(font, &error)) {
CFStringRef errorDescription = CFErrorCopyDescription(error);
NSLog(@"Failed to load font: %@", errorDescription);
CFRelease(errorDescription);
}
CFRelease(font);
CFRelease(provider);
}
}
}
// Use as follow inside your view controller...
- (void)viewDidLoad
{
[super viewDidLoad];
// pass all font files name into array which you want to load dynamically...
NSMutableArray *customFontsPath = [[NSMutableArray alloc] init];
NSArray *fontFileNameArray = [NSArray arrayWithObjects:@"elbow_v001.ttf",@"GothamRnd-MedItal.otf", nil];
for(NSString *fontFileName in fontFileNameArray){
NSString *fileName = [fontFileName stringByDeletingPathExtension];
NSString *fileExtension = [fontFileName pathExtension];
[customFontsPath addObject:[[NSBundle mainBundle] pathForResource:fileName ofType:fileExtension]];
}
AppDelegate *appDel = (AppDelegate *)[[UIApplication sharedApplication] delegate];
// load custom font into memory...
[appDel loadCustomFont:customFontsPath];
// Use font as below
[lblName setFont:[UIFont fontWithName:@"Elbow v100" size:15.0]];
[lblName2 setFont:[UIFont fontWithName:@"Gotham Rounded" size:20.0]];
}
從服務器下載TTF文件?
如果您正在下載TTF文件,那么您可以使用iOS Font Manager注冊自定義字體,這段代碼也會處理TTF文件更新 (字體更新):
+(void)registerFontsAtPath:(NSString *)ttfFilePath
{
NSFileManager * fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:ttfFilePath] == YES)
{
[UIFont familyNames];//This is here for a bug where font registration API hangs for forever.
//In case of TTF file update : Fonts are already registered, first de-register them from Font Manager
CFErrorRef cfDe_RegisterError;
bool fontsDeregistered = CTFontManagerUnregisterFontsForURL((__bridge CFURLRef)[NSURL fileURLWithPath:ttfFilePath], kCTFontManagerScopeNone, &cfDe_RegisterError);
//finally register the fonts with Font Manager,
CFErrorRef cfRegisterError;
bool fontsRegistered= CTFontManagerRegisterFontsForURL((__bridge CFURLRef)[NSURL fileURLWithPath:ttfFilePath], kCTFontManagerScopeNone, &cfRegisterError);
}
這里的swift版本:
let inData: NSData = /* your font-file data */;
let error: UnsafeMutablePointer<Unmanaged<CFError>?> = nil
let provider = CGDataProviderCreateWithCFData(inData)
if let font = CGFontCreateWithDataProvider(provider) {
if (!CTFontManagerRegisterGraphicsFont(font, error)) {
if let unmanagedError = error.memory {
let errorDescription = CFErrorCopyDescription(unmanagedError.takeUnretainedValue())
NSLog("Failed to load font: \(errorDescription)");
}
}
}
以下是Swift 3的@ mt81的更新答案:
guard
let path = "Path to some font file",
let fontFile = NSData(contentsOfFile: path)
else {
print "Font file not found?"
}
guard let provider = CGDataProvider(data: fontFile)
else {
print "Failed to create DataProvider"
}
let font = CGFont(provider)
let error: UnsafeMutablePointer<Unmanaged<CFError>?>? = nil
guard CTFontManagerRegisterGraphicsFont(font, error) else {
guard
let unError = error?.pointee?.takeUnretainedValue(),
let description = CFErrorCopyDescription(unError)
else {
print "Unknown error"
}
print description
}
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