字体描述符在iOS 8中返回nil [英] Font Descriptor returns nil in iOS 8

问题描述

以下代码在iOS 7中运行良好，但在iOS 8中不会返回粗体或斜体字体。对于Helvetica Neue可以使用，但对Arial字体不起作用。

The following code works fine in iOS 7, but doesn't return bold or italic font in iOS 8. It is ok for Helvetica Neue, but doesn't work for Arial font.

UIFontDescriptor *descriptor1 = [UIFontDescriptor fontDescriptorWithFontAttributes:@{UIFontDescriptorFamilyAttribute: @"Arial"}];
UIFontDescriptor* boldFontDescriptor1 = [descriptor1 fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold];
UIFont* font1 = [UIFont fontWithDescriptor:boldFontDescriptor1 size:16.0];
[self.lblArialB setFont:font1];

在设备和模拟器上测试并仍然出现相同的错误。

Tested on device and simulator and still same error.

推荐答案

FWIW，这是我提出的解决方法，使用UIFontDescriptor的属性字典初始化程序而不是看似错误的fontDescriptorWithSymbolicTraits：

FWIW, this is the workaround I came up with, using UIFontDescriptor's attributes dictionary initializer instead of the seemingly buggy fontDescriptorWithSymbolicTraits:

NSString *fontFamily = @"Arial";
BOOL isBold = YES;
BOOL isItalic = YES;
CGFloat fontSize = 20.0;
UIFontDescriptor *fontDescriptor = [UIFontDescriptor fontDescriptorWithFontAttributes:
                  @{
                    @"NSFontFamilyAttribute" : fontFamily,
                    @"NSFontFaceAttribute" : (isBold && isItalic ? @"Bold Italic" : (isBold ? @"Bold" : (isItalic ? @"Italic" : @"Regular")))
                    }];
UIFont *font = [UIFont fontWithDescriptor:fontDescriptor size:fontSize];

这篇关于字体描述符在iOS 8中返回nil的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！