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DownloadFont/ViewController.m

/*

     File: ViewController.m

 Abstract: Demonstrates how to download fonts on demand.

  Version: 1.0

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*/

#import "ViewController.h"

#import <CoreText/CoreText.h>

@interface ViewController ()

@property (strong, nonatomic) NSString *errorMessage;

@end

@implementation ViewController

- (void)asynchronouslySetFontName:(NSString *)fontName

    UIFont* aFont = [UIFont fontWithName:fontName size:12.];

    // If the font is already downloaded

    if (aFont && ([aFont.fontName compare:fontName] == NSOrderedSame || [aFont.familyName compare:fontName] == NSOrderedSame)) {

        // Go ahead and display the sample text.

        NSUInteger sampleIndex = [_fontNames indexOfObject:fontName];

        _fTextView.text = [_fontSamples objectAtIndex:sampleIndex];

        _fTextView.font = [UIFont fontWithName:fontName size:24.];

        return;

    // Create a dictionary with the font's PostScript name.

    NSMutableDictionary *attrs = [NSMutableDictionary dictionaryWithObjectsAndKeys:fontName, kCTFontNameAttribute, nil];

    // Create a new font descriptor reference from the attributes dictionary.

    CTFontDescriptorRef desc = CTFontDescriptorCreateWithAttributes((__bridge CFDictionaryRef)attrs);

    NSMutableArray *descs = [NSMutableArray arrayWithCapacity:0];

    [descs addObject:(__bridge id)desc];

    CFRelease(desc);

    __block BOOL errorDuringDownload = NO;

    // Start processing the font descriptor..

    // This function returns immediately, but can potentially take long time to process.

    // The progress is notified via the callback block of CTFontDescriptorProgressHandler type.

    // See CTFontDescriptor.h for the list of progress states and keys for progressParameter dictionary.

    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(@"Begin Matching");

});

        } 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 font

                NSUInteger sampleIndex = [_fontNames indexOfObject:fontName];

                _fTextView.text = [_fontSamples objectAtIndex:sampleIndex];

                _fTextView.font = [UIFont fontWithName:fontName size:24.];

                // Log the font URL in the console

                CTFontRef 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(@"Begin Downloading");

});

        } else if (state == kCTFontDescriptorMatchingDidFinishDownloading) {

            dispatch_async( dispatch_get_main_queue(), ^ {

                // Remove the progress bar

                _fProgressView.hidden = YES;

                NSLog(@"Finish downloading");

});

        } 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(@"Downloading %.0f%% complete", progressValue);

});

        } else if (state == kCTFontDescriptorMatchingDidFailWithError) {

            // An error has occurred.

            // Get the error message

            NSError *error = [(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingError];

            if (error != nil) {

                _errorMessage = [error description];

            } else {

                _errorMessage = @"ERROR MESSAGE IS NOT AVAILABLE!";

            // Set our flag

            errorDuringDownload = YES;

            dispatch_async( dispatch_get_main_queue(), ^ {

                _fProgressView.hidden = YES;

                NSLog(@"Download error: %@", _errorMessage);

});

        return (bool)YES;

});

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

    return [_fontNames count];

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *MyIdentifier = @"MyIdentifier";

    // Try to retrieve from the table view a now-unused cell with the given identifier.

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    // If no cell is available, create a new one using the given identifier.

    if (cell == nil) {

        // Use the default cell style.

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];

    // Set up the cell.

    cell.textLabel.text = _fontNames[indexPath.row];

    return cell;

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    [self asynchronouslySetFontName:_fontNames[indexPath.row]];

    // Dismiss the keyboard in the text view if it is currently displayed

    if ([self.fTextView isFirstResponder])

        [self.fTextView resignFirstResponder];

- (void)viewDidLoad

    [super viewDidLoad];

    self.fontNames = [[NSArray alloc] initWithObjects:

                        @"STXingkai-SC-Light",

                        @"DFWaWaSC-W5",

                        @"FZLTXHK--GBK1-0",

                        @"STLibian-SC-Regular",

                        @"LiHeiPro",

                        @"HiraginoSansGB-W3",

                        nil];

    self.fontSamples = [[NSArray alloc] initWithObjects:

                        @"汉体书写信息技术标准相",

                        @"容档案下载使用界面简单",

                        @"支援服务升级资讯专业制",

                        @"作创意空间快速无线上网",

                        @"兙兛兞兝兡兣嗧瓩糎",

                        @"㈠㈡㈢㈣㈤㈥㈦㈧㈨㈩",

                        nil];

- (void)didReceiveMemoryWarning

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

@end

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