如何使用iPhone SDK下载文本文件？

I am sort of new to developing view-based iPhone applications, and I need to download this "txt" file off the internet and save it into the documents folder of the app. Can anyone show me simply how I can do this? The txt file is of a tiny size, so I wouldn't need any User interface objects...

我是开发基于视图的iPhone应用程序的新手,我需要从互联网上下载这个“txt”文件并将其保存到应用程序的文档文件夹中。谁能告诉我我怎么做到这一点? txt文件很小,所以我不需要任何用户界面对象......

Thanks,

Kevin

2 个解决方案

#1

NSError *err = nil;
NSString *url = [[NSString stringWithFormat:@"http://myurl.com/mypage"] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *myTxtFile = [NSString stringWithContentsOfURL:[NSURL URLWithString:url] encoding:NSUTF8StringEncoding error:&err];
if(err != nil) {
    //HANDLE ERROR HERE
}

Then to save it you can use:

然后保存它你可以使用:

[[NSUserDefaults standardUserDefaults] setObject:myTxtFile forKey:@"MyFile"];

And to retrieve it:

并检索它:

NSString *myTxtFile = [[NSUserDefaults standardUserDefaults] stringForKey:@"MyFile"];

Updated to reflect Joe's input

更新以反映Joe的输入

#2

Hey you can write the string content to the file in the document folder like this:

嘿,您可以将字符串内容写入文档文件夹中的文件,如下所示:

//get the documents directory:

//获取文档目录:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

//make a file name to write the data to using the documents directory:

//使用文档目录创建文件名以写入数据:

NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt",documentsDirectory];

//save content of myTxtFile to the documents directory

//将myTxtFile的内容保存到文档目录中

**[myTxtFile writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];**

After executing this, you'll find a file named textfile.txt in the document folder with the content stored in it..

执行此操作后,您将在文档文件夹中找到一个名为textfile.txt的文件,其中存储了内容。

Cheers!!!

#1

NSError *err = nil;
NSString *url = [[NSString stringWithFormat:@"http://myurl.com/mypage"] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *myTxtFile = [NSString stringWithContentsOfURL:[NSURL URLWithString:url] encoding:NSUTF8StringEncoding error:&err];
if(err != nil) {
    //HANDLE ERROR HERE
}