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据我从这个 WWDC doc可以看出，我的代码应该可以工作，但它不能：

NSString *fontName = [@"MaisonNeue-" stringByAppendingString:@"Light"];
UIFont *originalFont = [UIFont fontWithName:fontName size:size];
UIFontDescriptor *originalDescriptor = [originalFont fontDescriptor];

NSMutableCharacterSet *cset = [[originalDescriptor objectForKey:UIFontDescriptorCharacterSetAttribute] mutableCopy];
[cset formIntersectionWithCharacterSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];

NSDictionary *newAttributes = @{UIFontDescriptorCharacterSetAttribute: cset};

UIFontDescriptor *monospaceDescriptor = [originalDescriptor fontDescriptorByAddingAttributes:newAttributes];
UIFont *newFont = [UIFont fontWithDescriptor:monospaceDescriptor size:0.0];

怎么了？新创建的字体仍然包含我专门删除的字符：

(lldb) p [cset characterIsMember:'2']
(bool) $0 = false
(lldb) po [(NSCharacterSet *)[(id)monospaceDescriptor objectForKey:UIFontDescriptorCharacterSetAttribute] characterIsMember:'2']
false
(lldb) po [(NSCharacterSet *)[[newFont fontDescriptor] objectForKey:UIFontDescriptorCharacterSetAttribute] characterIsMember:'2']
true
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