我一直在处理一个bug，这已经困扰了我几周了，但我似乎总是无法找到它的根源，所以我希望有人能为我解惑...
我在XIB文件中设置了基本的UITextView并使用了包含的字体来设置字体，但不是默认字体（在这种情况下是"Avenir"），然后我使用了几行代码来通过使用属性文本属性更改行高。我还应该提到，我正在使用ARC。
在iPad mini上（或模拟器上的普通iPad）输出看起来非常完美，但在iPad retina（或视网膜模拟器）上，输出被推回到系统默认字体 - Helvetica，尽管保留了行距。
我尝试编程创建UITextView而不是在XIB中创建，仍然没有好运。这是我用于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，由于某种原因，
UITextView 似乎持有一组双重的属性字符串。当我打印时，结果如下：NSLog(@"Font Attributes: %@", theTextView.attributedText);
这是我得到的输出:
非Retina
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;
}
视网膜屏幕
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;
}
我已在GitHub上创建了一个简单的示例项目来展示问题 - https://github.com/mpatteson/UITextViewBug 有什么想法？