【读书笔记】UIFont-动态下载系统提供的字体-官方代码

一，工程目录

 

 

二，AppDelegate.m

 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch.
 ViewController *view=[[ViewController alloc]init]; UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:view]; self.window.backgroundColor=[UIColor whiteColor]; self.window.rootViewController=nav; return YES; }

 

三，ViewController.h

 

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITableViewDelegate,UITableViewDataSource> { UITableView *myTableView; NSArray *fontNames; NSArray *fontSamples; } @end

 

四， ViewController.m

 

#import "ViewController.h"
#import <CoreText/CoreText.h>

@interface ViewController () @end

@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //初始化数据
 [self addData]; //初始化界面
 [self addView]; } #pragma -mark -functions
//初始化界面
-(void)addView { myTableView=[[UITableView alloc]initWithFrame:CGRectMake(0, 100, 320, 200)]; myTableView.delegate=self; myTableView.dataSource=self; [self.view addSubview:myTableView]; } //初始化数据
-(void)addData { fontNames = [[NSArray alloc] initWithObjects: @"STXingkai-SC-Light", @"DFWaWaSC-W5", @"FZLTXHK--GBK1-0", @"STLibian-SC-Regular", @"LiHeiPro", @"HiraginoSansGB-W3", nil]; 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]; } #pragma -mark -UITableViewDelegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [fontNames count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *MyIdentifier = @"MyIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier]; } cell.textLabel.text = fontNames[indexPath.row]; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [self asynchronouslySetFontName:fontNames[indexPath.row]]; } #pragma -mark -functions
//字体开始进行下载
- (void)asynchronouslySetFontName:(NSString *)fontName { UIFont* aFont = [UIFont fontWithName:fontName size:12.]; //判断字体是否已经被下载
    if (aFont && ([aFont.fontName compare:fontName] == NSOrderedSame || [aFont.familyName compare:fontName] == NSOrderedSame)) { NSLog(@"字体已经被下载"); return; } //用字体的PostScript名字创建一个Dictionary
    NSMutableDictionary *attrs = [NSMutableDictionary dictionaryWithObjectsAndKeys:fontName, kCTFontNameAttribute, nil]; // 创建一个字体描述对象CTFontDescriptorRef
    CTFontDescriptorRef desc = CTFontDescriptorCreateWithAttributes((__bridge CFDictionaryRef)attrs); //将字体描述对象放到一个NSMutableArray中
    NSMutableArray *descs = [NSMutableArray arrayWithCapacity:0]; [descs addObject:(__bridge id)desc]; CFRelease(desc); __block BOOL errorDuringDownload = NO; //开始对字体进行下载
    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(), ^ { NSLog(@"字体已经匹配"); }); } else if (state == kCTFontDescriptorMatchingDidFinish) { dispatch_async( dispatch_get_main_queue(), ^ { NSLog(@"字体下载完成"); // Log the font URL in the console
                CTFontRef fontRef = CTFontCreateWithName((__bridge CFStringRef)fontName, 0., NULL); CFStringRef fontURL = CTFontCopyAttribute(fontRef, kCTFontURLAttribute); CFRelease(fontURL); CFRelease(fontRef); if (!errorDuringDownload) { NSLog(@"%@ downloaded", fontName); } }); } else if (state == kCTFontDescriptorMatchingWillBeginDownloading) { dispatch_async( dispatch_get_main_queue(), ^ { NSLog(@"字体开始下载"); }); } else if (state == kCTFontDescriptorMatchingDidFinishDownloading) { dispatch_async( dispatch_get_main_queue(), ^ { NSLog(@"字体下载完成"); }); } else if (state == kCTFontDescriptorMatchingDownloading) { dispatch_async( dispatch_get_main_queue(), ^ { NSLog(@"下载进度"); }); } else if (state == kCTFontDescriptorMatchingDidFailWithError) { NSLog(@"下载失败"); NSError *error = [(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingError]; if (error != nil) { NSLog(@"errorMessage--%@-",[error description]); } else { NSLog(@"error message is not available"); } errorDuringDownload = YES; dispatch_async( dispatch_get_main_queue(), ^ { NSLog(@"Download error: %@", [error description]); }); } return (bool)YES; }); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.
} @end

 

参考资料：《iOS开发进阶》 -唐巧