我现在断断续续地研究一个错误（因为它让我发疯）已经有几个星期了，但我似乎无法深入了解它，所以我正在伸出援手，希望有人能为我阐明这一点...
我UITextView在 XIB 文件中进行了基本设置，并使用包含的字体设置了字体，但不是默认字体（在本例中为“Avenir”），然后我使用几行代码来更改行高通过使用属性文本属性。我还应该提到我正在使用ARC。
输出在 iPad mini（或模拟器上的普通 iPad）上看起来很完美，但在 iPad 视网膜（或视网膜模拟器）上，输出被敲回系统默认字体 - Helvetica，尽管它保持行距。
我尝试以UITextView编程方式而不是在 XIB 中创建，但仍然没有运气。这是我用来设置属性文本的代码：
NSString *string = theTextView.text;
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.minimumLineHeight = 48.f;
NSMutableAttributedString *aStr = [[NSMutableAttributedString alloc] initWithString:string];
[aStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0,[string length])];
theTextView.attributedText = aStr;
据我所知，在视网膜设备上，出于某种原因，它UITextView似乎持有一组双属性字符串。当我打印
NSLog(@"Font Attributes: %@", theTextView.attributedText);
这是我得到的输出：
非视网膜
Font Attributes: Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.
{
NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSFont = "<UICFFont: 0x714c930> font-family: \"Avenir-Roman\"; font-weight: normal; font-style: normal; font-size: 24px";
NSKern = 0;
NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 48/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (null), Lists (null), BaseWritingDirection 0, HyphenationFactor 0, TighteningFactor 0, HeaderLevel 0";
NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSStrokeWidth = 0;
}
视网膜
Font Attributes: Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.
{
NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSFont = "<UICFFont: 0x71ed950> font-family: \"Helvetica\"; font-weight: normal; font-style: normal; font-size: 12px";
NSKern = 0;
NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 48/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (null), Lists (null), BaseWritingDirection 0, HyphenationFactor 0, TighteningFactor 0, HeaderLevel 0";
NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSStrokeWidth = 0;
}
{
NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSFont = "<UICFFont: 0x71e67d0> font-family: \"Avenir-Roman\"; font-weight: normal; font-style: normal; font-size: 24px";
NSKern = 0;
NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 48/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (null), Lists (null), BaseWritingDirection 0, HyphenationFactor 0, TighteningFactor 0, HeaderLevel 0";
NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
NSStrokeWidth = 0;
}
我也在 GitHub 上创建了一个简单的问题示例项目 -
https://github.com/mpatteson/UITextViewBug
有任何想法吗？