The IOS UI Learning tutorial distinguishes between NSBundle and Nsurl (reading files, writing files) _ios

The example of this article distinguishes NSBundle and Nsurl, and realizes the following contents

In the project to add a file, this routine is added to the Aa.txt, the contents of the file for Baidu: Www.baidu.com, now to use NSBundle and Nsurl respectively to get content, the code is as follows:

  read the contents of the file
//  Method 1: Read
  nsstring *pathbundle by file path = [[NSBundle mainbundle]pathforresource:@ ' AA ' OfType : @ "TXT"];
  NSString *outstringbundle = [NSString stringwithcontentsoffile:pathbundle encoding:nsutf8stringencoding Error:nil];  Method 2: Follow the URL to read
  nsurl *pathurl = [[NSBundle mainbundle]urlforresource:@ ' AA ' withextension:@ ' txt ' subdirectory : nil];
  NSString *outstringurl = [NSString stringwithcontentsofurl:pathurl encoding:nsutf8stringencoding Error:nil];
  
  NSLog (@ "%@\n////////\n%@", Outstringbundle,outstringurl);

The output results are as follows:

2016-03-30 14:48:02.939 sand box mechanism and file path [11,786:518,929] Baidu: www.baidu.com
 ////////
 Baidu: www.baidu.com

Write to File:

Create a new file first:

NSString *newpath = [NSString stringwithformat:@ "%@/documents/new", Nshomedirectory ()];  First, the file path and filename are defined well
   nsstring *newfile = [NSString stringwithformat:@ "%@/new.mp3", NewPath];  Create a file using Createfileatpath
   [[Nsfilemanager defaultmanager]createfileatpath:newfile Contents:nil attributes : nil];
   NSLog (@ "%@", NewPath);

After reading and writing:

  write to file
//  1, first read data
  nsdata *data = [[NSData alloc]initwithcontentsoffile:pathbundle];
  NSLog (@ "%@", data);  2. Writes the read data to the sandbox file, newfile the mp3 file
  [data writetofile:newfile Atomically:yes] created in the sandbox file above;

Through a brief example for everyone to distinguish NSBundle and nsurl, I hope to help you learn.