iOS File Handling | Novice Tutorial

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iOS File Handling

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Introduction

File handling cannot be intuitively interpreted through the application. We can understand iOS file handling from the following examples.

File operations in iOS. Because the application is in a sandbox, file read and write permissions are limited, and files can only be read and written in a few directories.

Methods Used in File Handling

Below is a list of methods used for accessing and manipulating files.

In the following examples, you must replace the FilePath1, FilePath, and FilePath strings with complete file paths to achieve the desired operation.

Check if a file exists

 NSFileManager *fileManager = ; //Get documents directory NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectoryPath = [directoryPaths objectAtIndex:0]; if ([fileManager fileExistsAtPath:@""]==YES) { NSLog(@"File exists"); }

Compare the contents of two files

 if ([fileManager contentsEqualAtPath:@"FilePath1" andPath:@" FilePath2"]) { NSLog(@"Same content"); }

Check if a file is writable, readable, or executable

 if ([fileManager isWritableFileAtPath:@"FilePath"]) { NSLog(@"isWritable"); } if ([fileManager isReadableFileAtPath:@"FilePath"]) { NSLog(@"isReadable"); } if ( [fileManager isExecutableFileAtPath:@"FilePath"]){ NSLog(@"is Executable"); }

Move a file

 if([fileManager moveItemAtPath:@"FilePath1" toPath:@"FilePath2" error:NULL]){ NSLog(@"Moved successfully"); }

Copy a file

 if ([fileManager copyItemAtPath:@"FilePath1" toPath:@"FilePath2" error:NULL]) { NSLog(@"Copied successfully"); }

Delete a file

 if ([fileManager removeItemAtPath:@"FilePath" error:NULL]) { NSLog(@"Removed successfully"); }

Read a file

 NSData *data = [fileManager contentsAtPath:@"Path"];

Write to a file

 [fileManager createFileAtPath:@"" contents:data attributes:nil];