p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #d12f1b }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #000000; min-height: 16.0px }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #703daa }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #ba2da2 }
p.p5 { margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #000000 }
span.s1 { color: #78492a }
span.s2 { }
span.s3 { color: #ba2da2 }
span.s4 { color: #000000 }
span.s5 { color: #4f8187 }
span.s6 { color: #703daa }
#import "ViewController.h"
#import <CoreText/CoreText.h>
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *fTableView;
@property (weak, nonatomic) IBOutlet UITextView *fTextView;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *fActivityIndicatorView;
@property (weak, nonatomic) IBOutlet UIProgressView *fProgressView;
@property (strong, nonatomic) NSArray *fontNames;//字体的名字
@property (copy, nonatomic) NSString *fontSamples;//展示的话
@property (copy, nonatomic) NSString *errorMessage;
@end
@implementation ViewController
详细代码如下:
1 - (void)viewDidLoad 2 { 3 [super viewDidLoad]; 4 5 self.fontNames = [[NSArray alloc] initWithObjects: 6 @"STXingkai-SC-Light", 7 @"DFWaWaSC-W5", 8 @"FZLTXHK--GBK1-0", 9 @"STLibian-SC-Regular", 10 @"LiHeiPro", 11 @"HiraginoSansGB-W3", 12 nil]; 13 self.fontSamples = @"让优秀的人拥有值得的归宿。"; 14 } 15 16 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ 17 return [_fontNames count]; 18 } 19 20 21 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 22 static NSString *MyIdentifier = @"MyIdentifier"; 23 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier]; 24 if (cell == nil) { 25 cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier]; 26 } 27 cell.textLabel.text = _fontNames[indexPath.row]; 28 return cell; 29 } 30 31 32 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ 33 [self asynchronouslySetFontName:_fontNames[indexPath.row]]; 34 if ([self.fTextView isFirstResponder]) 35 [self.fTextView resignFirstResponder]; 36 } 37 38 - (void)asynchronouslySetFontName:(NSString *)fontName{ 39 if ([self isFontDownloaded:fontName]) { 40 _fTextView.text = _fontSamples; 41 _fTextView.font = [UIFont fontWithName:fontName size:24.]; 42 return; 43 }else{ 44 //如果名为fontName的字体尚未下载,则动态下载。使用UIActivityIndicatorView和UIProgressView辅助完成下载过程 45 NSMutableDictionary *attrs = [NSMutableDictionary dictionaryWithObjectsAndKeys:fontName, kCTFontNameAttribute, nil]; 46 CTFontDescriptorRef desc = CTFontDescriptorCreateWithAttributes((__bridge CFDictionaryRef)attrs); 47 NSMutableArray *descs = [NSMutableArray arrayWithCapacity:0]; 48 [descs addObject:(__bridge id)desc]; 49 CFRelease(desc); 50 51 __block BOOL errorDuringDownload = NO; 52 CTFontDescriptorMatchFontDescriptorsWithProgressHandler( (__bridge CFArrayRef)descs, NULL, ^(CTFontDescriptorMatchingState state, CFDictionaryRef progressParameter) { 53 54 double progressValue = [[(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingPercentage] doubleValue]; 55 56 if (state == kCTFontDescriptorMatchingDidBegin) { 57 dispatch_async( dispatch_get_main_queue(), ^ { 58 [_fActivityIndicatorView startAnimating]; 59 _fActivityIndicatorView.hidden = NO; 60 _fTextView.text= [NSString stringWithFormat:@"正在下载 %@ 字体", fontName]; 61 _fTextView.font = [UIFont systemFontOfSize:14.]; 62 }); 63 } else if (state == kCTFontDescriptorMatchingDidFinish) { 64 dispatch_async( dispatch_get_main_queue(), ^ { 65 [_fActivityIndicatorView stopAnimating]; 66 _fActivityIndicatorView.hidden = YES; 67 _fTextView.text = _fontSamples; 68 _fTextView.font = [UIFont fontWithName:fontName size:24.]; 69 if (!errorDuringDownload) { 70 NSLog(@"字体 %@ 下载完成", fontName); 71 } 72 }); 73 } else if (state == kCTFontDescriptorMatchingWillBeginDownloading) { 74 dispatch_async( dispatch_get_main_queue(), ^ { 75 _fProgressView.progress = 0.0; 76 _fProgressView.hidden = NO; 77 }); 78 } else if (state == kCTFontDescriptorMatchingDidFinishDownloading) { 79 dispatch_async( dispatch_get_main_queue(), ^ { 80 _fProgressView.hidden = YES; 81 }); 82 } else if (state == kCTFontDescriptorMatchingDownloading) { 83 dispatch_async( dispatch_get_main_queue(), ^ { 84 [_fProgressView setProgress:progressValue / 100.0 animated:YES]; 85 }); 86 } else if (state == kCTFontDescriptorMatchingDidFailWithError) { 87 NSError *error = [(__bridge NSDictionary *)progressParameter objectForKey:(id)kCTFontDescriptorMatchingError]; 88 if (error != nil) { 89 _errorMessage = [error description]; 90 } else { 91 _errorMessage = @"ERROR MESSAGE IS NOT AVAILABLE!"; 92 } 93 errorDuringDownload = YES; 94 dispatch_async( dispatch_get_main_queue(), ^ { 95 _fProgressView.hidden = YES; 96 NSLog(@"下载错误: %@", _errorMessage); 97 }); 98 } 99 100 return (bool)YES; 101 }); 102 } 103 } 104 105 106 - (BOOL)isFontDownloaded:(NSString *)fontName{ 107 UIFont * aFont = [UIFont fontWithName:fontName size:12.0]; 108 return (aFont && ([aFont.fontName compare:fontName] == NSOrderedSame || [aFont.familyName compare:fontName] == NSOrderedSame)); 109 }
实现效果: