将pdf文件保存在设备中 [英] save pdf file in device

问题描述

我在程序中生成了一个pdf文件，并且在这里:

I generated a pdf file in my program and I have it here :

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *file = [documentsDirectory stringByAppendingFormat:@"/CEX.pdf"];
    NSData *data = [NSData dataWithContentsOfFile:file];

我知道如何将照片保存在照片库中，但不知道该如何处理pdf文件以及如何以及在何处将其保存在设备中.谁能帮我吗? :)

I know how to save photos in the photo gallery but have no idea what should I do with pdf file and how and where to save it in the device. Can anyone help me please ?! :)

推荐答案

您发布的代码用于从Documents目录读取现有的PDF文件.

The code you posted is for reading an existing PDF file from the Documents directory.

如果要编写PDF，则需要获取代表PDF的NSData对象，创建文件的路径，然后使用NSData writeToFile:options:error:方法将数据保存到文件中.

If you want to write the PDF, you need to get the NSData object representing the PDF, create a path to the file, then use the NSData writeToFile:options:error: method to save the data to the file.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *file = [documentsDirectory stringByAppendingPathComponent:@"MyDocument.pdf"];

NSData *pdfData = ... // data representing your created PDF
NSError *error = nil;
if ([pdfData writeToFile:file options:NSDataWritingAtomic error:&error]) {
    // file saved
} else {
    // error writing file
    NSLog(@"Unable to write PDF to %@. Error: %@", file, error);
}

顺便说一句-在您的原始代码中，替换:

BTW - in your original code, replace:

NSString *file = [documentsDirectory stringByAppendingFormat:@"/CEX.pdf"];

具有:

NSString *file = [documentsDirectory stringByAppendingPathComponent:@"CEX.pdf"];

除非您确实有要处理的字符串格式，否则请不要使用字符串格式.

Don't use string formats unless you really have a string format to process.

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