NSAttributedString:如何在另一个NSAttributedString中创建多行

// 创建NSMutableAttributedString实例
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];

// 定义每一行的文本内容
NSString *line1 = @"这是第一行文本";
NSString *line2 = @"这是第二行文本";
NSString *line3 = @"这是第三行文本";

// 创建NSMutableParagraphStyle实例，用于设置段落样式
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = 10; // 行间距

// 设置第一行文本的格式
NSAttributedString *attributedLine1 = [[NSAttributedString alloc] initWithString:line1 attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:16], NSForegroundColorAttributeName: [UIColor redColor]}];
[attributedString appendAttributedString:attributedLine1];

// 添加换行符
NSAttributedString *lineBreak = [[NSAttributedString alloc] initWithString:@"\n"];
[attributedString appendAttributedString:lineBreak];

// 设置第二行文本的格式
NSAttributedString *attributedLine2 = [[NSAttributedString alloc] initWithString:line2 attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14], NSForegroundColorAttributeName: [UIColor blueColor]}];
[attributedString appendAttributedString:attributedLine2];

// 添加换行符
[attributedString appendAttributedString:lineBreak];

// 设置第三行文本的格式
NSAttributedString *attributedLine3 = [[NSAttributedString alloc] initWithString:line3 attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12], NSForegroundColorAttributeName: [UIColor greenColor]}];
[attributedString appendAttributedString:attributedLine3];

// 将attributedString应用到UILabel或UITextView等控件上显示
label.attributedText = attributedString;