UIFontDownLoad ----动态下载系统提供的字体
程序运行结果如下 :
当点击对应单元格实现下载对应的字体.
控制台打印结果如下 :
2015-10-05 11:14:04.132 UIFontDownLoad[12721:86827] state 0 - {
}
2015-10-05 11:14:04.134 UIFontDownLoad[12721:86827] state 7 - {
CTFontDescriptorMatchingResult = (
"UICTFontDescriptor <0x7fddd05388d0> = {\n NSFontNameAttribute = Helvetica;\n NSFontSizeAttribute = 12;\n}"
);
CTFontDescriptorMatchingSourceDescriptor = "UICTFontDescriptor <0x7fddd0797a80> = {\n NSFont = \"STXingkai-SC-Light\";\n}";
}
2015-10-05 11:14:04.134 UIFontDownLoad[12721:86827] state 1 - {
CTFontDescriptorMatchingResult = (
"UICTFontDescriptor <0x7fddd05388d0> = {\n NSFontNameAttribute = Helvetica;\n NSFontSizeAttribute = 12;\n}"
);
}
2015-10-05 11:14:04.147 UIFontDownLoad[12721:85405] 字体已经匹配
2015-10-05 11:14:04.147 UIFontDownLoad[12721:85405] 字体下载完成
2015-10-05 11:14:05.562 UIFontDownLoad[12721:85405] STXingkai-SC-Light downloaded
程序实现的代码如下 :
//
// ViewController.m
// UIFontDownLoad
//
// Created by mac1 on 15/10/5.
// Copyright (c) 2015年 www.iphonetrain.com. All rights reserved.
//
#import "ViewController.h"
/*
一种能够对文本格式和文本布局进行精细控制的文本引擎
*/
#import <CoreText/CoreText.h>
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic,strong)NSArray *fontNames;
@property (nonatomic,strong)NSArray *fontSamples;
@property (nonatomic,strong)UITableView *myTableView;
@end
static NSString *identify = @"cell";
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor greenColor];
[self addData];
[self creatUI];
}
//初始化界面
- (void)creatUI
{
_myTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];
_myTableView.dataSource = self;
_myTableView.delegate = self;
[self.view addSubview:_myTableView];
/*
注册单元格
[_myTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:identify];
*/
}
//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];
}
//行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _fontNames.count;
}
//创建单元格
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//直接显示内容就不注册单元格
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identify];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify];
}
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,kCTFontAttributeName, 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;
});
}
