如何在Objective-c中在没有ThirdParty库的情况下向我的NSString显示粗体和斜体

Question

这是我尝试的代码：

NSString *strFirst = [NSString stringWithFormat:@"The App feature is only available to users while at "];
NSString *strAreaName = kAreaName;
NSRange boldedRange = [strAreaName rangeOfString:strAreaName];

NSMutableAttributedString *newAttString = [[NSMutableAttributedString alloc] initWithString:strFirst];
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:strAreaName];
UIFont *fontText = [UIFont boldSystemFontOfSize:17.0];

NSDictionary *dictBoldText = [NSDictionary dictionaryWithObjectsAndKeys:fontText, NSFontAttributeName, nil];
[attrString setAttributes:dictBoldText range:boldedRange];

[newAttString appendAttributedString:attrString];

[lblFirst setAttributedText:newAttString];  

输出：
该应用程序功能仅适用于美国境内的用户

但是我要美国同时使用Bold和Italic。

请指导我添加我的字符​​串。

谢谢，
米希尔

Answer 1

如果没有第三方库，则可以在属性检查器中更改标签属性值，如下图所示。

Answer 2

这应该工作：

NSString *strAreaName = @"America";
NSString *html = [NSString stringWithFormat:@"<html><font size='7' face='Helvetica'>The App feature is only available to users while at <b><i>%@</i></b></font><html>", strAreaName];
 NSError *err = nil;
    lbl.attributedText =
    [[NSAttributedString alloc]
     initWithData: [html dataUsingEncoding:NSUTF8StringEncoding]
     options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
     documentAttributes: nil
     error: &err];  

附加输出：

Answer 3

也许您可以尝试以下代码：

//----Creating font dictionary for bold-italic text

UIFontDescriptor *fontDescriptor = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleBody];

UIFontDescriptor *fontDescriptorNew;
NSDictionary *dictBoldItalicText;

uint32_t NewStyles = [fontDescriptor symbolicTraits] | UIFontDescriptorTraitBold | UIFontDescriptorTraitItalic;
fontDescriptorNew = [fontDescriptor fontDescriptorWithSymbolicTraits:NewStyles];
UIFont *updatedFont = [UIFont fontWithDescriptor:fontDescriptorNew size:17.0];//set your font size
dictBoldItalicText = @{ NSFontAttributeName : updatedFont };

//----------

NSString *strFirst = [NSString stringWithFormat:@"The App feature is only available to users while at "];
NSString *strAreaName=@"America";

NSRange boldedRange = [strAreaName rangeOfString:strAreaName];

NSMutableAttributedString *newAttString = [[NSMutableAttributedString alloc] initWithString:strFirst];
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:strAreaName];


[attrString setAttributes:dictBoldItalicText range:boldedRange];//Assigning bold-italic attribute dictionary

[newAttString appendAttributedString:attrString];

[lblFirst setAttributedText:newAttString];

经过测试，工作正常。

Answer 4

请使用以下代码。

UIFontDescriptor *fontDescriptor = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleBody];

UIFontDescriptor *changedFontDescriptor;
NSDictionary *attributes;

uint32_t existingTraitsWithNewTrait = [fontDescriptor symbolicTraits] | UIFontDescriptorTraitBold | UIFontDescriptorTraitItalic;
changedFontDescriptor = [fontDescriptor fontDescriptorWithSymbolicTraits:existingTraitsWithNewTrait];

UIFont *updatedFont = [UIFont fontWithDescriptor:changedFontDescriptor size:0.0];

attributes = @{ NSFontAttributeName : updatedFont };

NSAttributedString *  newAttStringd = [[NSAttributedString alloc] initWithString:@"America" attributes:attributes];
lbl.attributedText  = newAttStringd;