iOS开发中如何计算字符串的高度

NSString * content = @"测试高度";
    
CGSize size = [content boundingRectWithSize:CGSizeMake(375-20, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:14]} context:nil].size;