NSString *ffontName = @"STBaoli-SC-Regular";UIFont* aFont = [UIFont fontWithName:fontName size:12.];// 判断字体是否已经下载if (aFont && ([aFont.fontName compare:fontName] == NSOrderedSame || [aFont.familyName compare:fontName] == NSOrderedSame)) {// 使用已下载的字体NSUInteger sampleIndex = [_fontNames indexOfObject:fontName];_fTextView.text = [_fontSamples objectAtIndex:sampleIndex];_fTextView.font = [UIFont fontWithName:fontName size:24.];return;}

    // 创建下载字体请求描述的准备NSMutableDictionary *attrs = [NSMutableDictionary dictionaryWithObjectsAndKeys:fontName, kCTFontNameAttribute, nil];CTFontDescriptorRef desc = CTFontDescriptorCreateWithAttributes((__bridge CFDictionaryRef)attrs);NSMutableArray *descs = [NSMutableArray arrayWithCapacity:0];[descs addObject:(__bridge id)desc];CFRelease(desc);//开始下载字体__block BOOL errorDuringDownload = NO;CTFontDescriptorMatchFontDescriptorsWithProgressHandler( (__bridge CFArrayRef)descs, NULL,  ^(CTFontDescriptorMatchingState state, CFDictionaryRef progressParameter) {//NSLog( @"state %d - %@", state, progressParameter);double progressValue = [[(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingPercentage] doubleValue];if (state == kCTFontDescriptorMatchingDidBegin) {dispatch_async( dispatch_get_main_queue(), ^ {// Show an activity indicator
                [_fActivityIndicatorView startAnimating];_fActivityIndicatorView.hidden = NO;// Show something in the text view to indicate that we are downloading_fTextView.text= [NSString stringWithFormat:@"Downloading %@", fontName];_fTextView.font = [UIFont systemFontOfSize:14.];NSLog(@"开始匹配...");});} else if (state == kCTFontDescriptorMatchingDidFinish) {dispatch_async( dispatch_get_main_queue(), ^ {// Remove the activity indicator
                [_fActivityIndicatorView stopAnimating];_fActivityIndicatorView.hidden = YES;// Display the sample text for the newly downloaded fontNSUInteger sampleIndex = [_fontNames indexOfObject:fontName];_fTextView.text = [_fontSamples objectAtIndex:sampleIndex];_fTextView.font = [UIFont fontWithName:fontName size:24.];// Log the font URL in the consoleCTFontRef fontRef = CTFontCreateWithName((__bridge CFStringRef)fontName, 0., NULL);CFStringRef fontURL = CTFontCopyAttribute(fontRef, kCTFontURLAttribute);NSLog(@"%@", (__bridge NSURL*)(fontURL));CFRelease(fontURL);CFRelease(fontRef);if (!errorDuringDownload) {NSLog(@"%@ downloaded", fontName);}});} else if (state == kCTFontDescriptorMatchingWillBeginDownloading) {dispatch_async( dispatch_get_main_queue(), ^ {// Show a progress bar_fProgressView.progress = 0.0;_fProgressView.hidden = NO;NSLog(@"开始下载...");});} else if (state == kCTFontDescriptorMatchingDidFinishDownloading) {dispatch_async( dispatch_get_main_queue(), ^ {// Remove the progress bar_fProgressView.hidden = YES;NSLog(@"下载完成");});} else if (state == kCTFontDescriptorMatchingDownloading) {dispatch_async( dispatch_get_main_queue(), ^ {// Use the progress bar to indicate the progress of the downloading[_fProgressView setProgress:progressValue / 100.0 animated:YES];NSLog(@"下载进度 %.0f%% complete", progressValue);});} else if (state == kCTFontDescriptorMatchingDidFailWithError) {// An error has occurred.// Get the error messageNSError *error = [(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingError];if (error != nil) {_errorMessage = [error description];} else {_errorMessage = @"ERROR MESSAGE IS NOT AVAILABLE!";}// Set our flagerrorDuringDownload = YES;dispatch_async( dispatch_get_main_queue(), ^ {_fProgressView.hidden = YES;NSLog(@"下载失败: %@", _errorMessage);});}return (bool)YES;});