将NSMutableAttributedString写入rtf文件无法打开？

Question

我尝试过的代码如下： -

#define FontFamily(fname,fsize) [UIFont fontWithName:fname size:fsize]
#define themeRed [UIColor colorWithRed:189.0f/255.0f green:0.0f/255.0f blue:12.0f/255.0f alpha:1]
#define helveticaBold @"HelveticaNeue-Bold"
#define helveticaReg @"HelveticaNeue"
#define M 16.0f
#define L 20.0f

撰写代码attributedString

 NSString *docDir = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp/MyUser"];
    NSFileManager *fm = [NSFileManager defaultManager];

    if (![fm fileExistsAtPath:docDir]) {
        [fm createDirectoryAtPath:docDir withIntermediateDirectories:NO attributes:nil error:nil];
    }

    NSString *filepath  = [docDir stringByAppendingPathComponent:@"WRP.rtf"];

    NSString *noteAsAttachment = [freehandTtl.text stringByAppendingString:[NSString stringWithFormat:@"\n%@",freehandTxt.text]];

    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:noteAsAttachment];

    [attributedStr addAttribute:NSFontAttributeName value:FontFamily(helveticaBold, L) range:NSMakeRange(0, freehandTtl.text.length)];
    [attributedStr addAttribute:NSForegroundColorAttributeName value:themeRed range:NSMakeRange(0, freehandTtl.text.length)];

    [attributedStr addAttribute:NSFontAttributeName value:FontFamily(helveticaReg, M) range:NSMakeRange(freehandTtl.text.length+1, freehandTxt.text.length)];

    NSLog(@"attr str is %@",attributedStr);

    [attributedStr fileWrapperFromRange:NSMakeRange(0, [attributedStr length])  documentAttributes:@{NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType} error:nil];

    NSFileWrapper *fileWrapper = [[NSFileWrapper alloc] init];

    BOOL success = [fileWrapper writeToURL:[NSURL fileURLWithPath:filepath] options:NSFileWrapperWritingAtomic originalContentsURL:nil error:nil];

我的字符串值如下： -

attr str is My File Title {
    NSColor = "UIDeviceRGBColorSpace 0.741176 0 0.0470588 1";
    NSFont = "<UICTFont: 0xa140f00> font-family: \"Helvetica Neue\"; font-weight: bold; font-style: normal; font-size: 20.00pt";
}
{
}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.{
    NSFont = "<UICTFont: 0x8ea1fc0> font-family: \"Helvetica Neue\"; font-weight: normal; font-style: normal; font-size: 16.00pt";
}

和BOOL类型的成功变量也显示yes，文件写成功。但是当我尝试在我的文件夹位置打开rtf文件时，它会显示一条错误消息，如下所示： -

Answer 1

这段代码没有任何意义：

[attributedStr fileWrapperFromRange:NSMakeRange(0, [attributedStr length])
                 documentAttributes:@{NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType}
                              error:nil];

NSFileWrapper *fileWrapper = [[NSFileWrapper alloc] init];

BOOL success = [fileWrapper writeToURL:[NSURL fileURLWithPath:filepath]
                               options:NSFileWrapperWritingAtomic
                   originalContentsURL:nil
                                 error:nil];

当您询问文件包装器的属性字符串，然后忽略它返回的内容并创建一个没有内容的新字符串。这有更大的成功机会：

NSFileWrapper *fileWrapper = [attributedStr fileWrapperFromRange:NSMakeRange(0, [attributedStr length])
                 documentAttributes:@{NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType}
                              error:nil];

BOOL success = [fileWrapper writeToURL:[NSURL fileURLWithPath:filepath]
                               options:NSFileWrapperWritingAtomic
                   originalContentsURL:nil
                                 error:nil];

Answer 2

另一种编写RTF的方法。

BOOL success = [self writeAttributeString:attributedStr toPath:filepath];

-(BOOL)writeAttributeString:(NSMutableAttributedString*)attrStr toPath:(NSString*)path
{
    NSData *data = [attrStr dataFromRange:NSMakeRange(0, [attrStr length])
                       documentAttributes:@{NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType,NSCharacterEncodingDocumentAttribute:[NSNumber numberWithInteger:1]} error:nil];

    return [data writeToFile:path atomically:YES];
}

这里filePath包含rtf文件路径到文件目录，扩展名为rtf。