如何确定在Objective-C中的Mac OSX计算机上是否安装了NSFont？

Question

有没有办法检查系统是否安装了带字符串名称的NSFont？

Answer 1

Check if it's present in this array:

NSArray *fonts = [[NSFontManager sharedFontManager] availableFontFamilies];

by calling

[fonts containsObject:@"Times"];

containsObject uses the isEqual: method to compare two objects. Because you know that every object in the fonts array is an NSString , you know that you'll get a YES if the array contains @"Times" , and a NO if it doesn't.

Answer 2

you should refer to

https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/FontHandling/FontHandling.html

for finding the font family (which might consist of several fonts (style)

NSFontDescriptor *helveticaNeueFamily =
    [NSFontDescriptor fontDescriptorWithFontAttributes:
        @{ NSFontFamilyAttribute: @"Helvetica Neue" }];
NSArray *matches =
    [helveticaNeueFamily matchingFontDescriptorsWithMandatoryKeys: nil];

and then you can check also for Bold, italic, etc (exact name)

NSFontDescriptor *fontDescriptor =
    [NSFontDescriptor fontDescriptorWithFontAttributes:
        @{ NSFontNameAttribute: @"Bank Gothic Medium" }];
NSArray *matches =
    [fontDescriptor matchingFontDescriptorsWithMandatoryKeys: nil];

like

- (BOOL)isFontNameInstalledInSystem {

    if (self.fontName == nil) {
        return NO;
    }

    NSFontDescriptor *fontDescriptor = [NSFontDescriptor fontDescriptorWithFontAttributes:@{NSFontNameAttribute:self.fontName}];
    NSArray *matches = [fontDescriptor matchingFontDescriptorsWithMandatoryKeys: nil];

    return ([matches count] > 0);
}

you might also want to use (But be sure to have the font name in right format) note that this ia bit more resource intensive

- (BOOL)isFontNameInstalledInSystem {
    return ([NSFont fontWithName:self.fontName size:[NSFont systemFontSize]]) != nil;
}