我有一个可以在 iphone 上查看的 RTF 文件,现在我需要以编程方式编辑该文件,请告诉我该怎么做。示例 RTF 文件内容“我是 StackOverflow 的新手”现在我需要以编程方式更改为以下行。“我经常访问 StackOverflow”并保存为 PDF 文件。请帮帮我:)
提前致谢 :)
在您的 .h 文件中添加一些对象并定义
#define kBorderInset 20.0
#define kBorderWidth 1.0
#define kMarginInset 10.0
@interface ViewController : UIViewController
{
CGSize pageSize;
NSString *pdfFileName;
NSString *contents_for_pdf;
}
- (void)generatePdfWithFilePath:(NSString *)thefilePath;
在 .m 文件中添加此行,单击按钮以获取字符串中 rtf 文件的内容
NSString *rtf_path = [[NSBundle mainBundle] pathForResource:@"example" ofType:@"rtf"];
contents_for_pdf = [[NSString alloc] initWithContentsOfFile:rtf_path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",contents_for_pdf);
contents_for_pdf = [contents_for_pdf stringByReplacingOccurrencesOfString:@"I am new to StackOverflow" withString:@"I regularly visit StackOverflow"];
pageSize = CGSizeMake(612, 792);
NSString *fileName = @"Demo.pdf";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
[self generatePdfWithFilePath:pdfFileName];
我没有修改 rtf 文件的文本,我只是在 rtf 文件中使用了相同的文本。你应该做你想做的(我注意到文本中有一些编码字符)和生成 pdf 的函数就在这里。
- (void) generatePdfWithFilePath: (NSString *)thefilePath
{
UIGraphicsBeginPDFContextToFile(thefilePath, CGRectZero, nil);
//Start a new page.
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil);
//Draw text fo our header.
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(currentContext, 0.0, 0.0, 0.0, 1.0);
UIFont *font = [UIFont systemFontOfSize:14.0];
CGSize stringSize = [contents_for_pdf sizeWithFont:font
constrainedToSize:CGSizeMake(pageSize.width - 2*kBorderInset-2*kMarginInset, pageSize.height - 2*kBorderInset - 2*kMarginInset)
lineBreakMode:UILineBreakModeWordWrap];
CGRect renderingRect = CGRectMake(kBorderInset + kMarginInset, kBorderInset + kMarginInset + 50.0, pageSize.width - 2*kBorderInset - 2*kMarginInset, stringSize.height);
[contents_for_pdf drawInRect:renderingRect
withFont:font
lineBreakMode:UILineBreakModeWordWrap
alignment:UITextAlignmentLeft];
UIGraphicsEndPDFContext();
UIAlertView *Alert = [[UIAlertView alloc] initWithTitle:@"PDF Created" message:@"Sucessfull" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil, nil];
[Alert show];
}