NSArray 对象保存

NSString *strOne = @"Persistent data1";
NSString *strTwo = @"Persistent data 2";
 
NSMutableArray *persistentArray = [[NSMutableArray alloc] init];
[persistentArray addObject:strOne];
[persistentArray addObject:strTwo];
 
 NSArray *filePathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
 NSString *filePath =[[filePathArray objectAtIndex:0] stringByAppendingPathComponent:@"mydatas.plist"];

[[NSArray arrayWithObjects:persistentArray,nil] writeToFile:filePath atomically:NO];
 
 //load
 NSMutableArray *saveDataArray = [[NSMutableArray alloc] init];
 if([[NSFileManager defaultManager] fileExistsAtPath:filePath])
  saveDataArray = [NSMutableArray arrayWithContentsOfFile:filePath];  
 else
  saveDataArray = [NSMutableArray arrayWithContentsOfFile:[[NSBundle   mainBundle]pathForResource:@"Savedatas" ofType:@"plist"]];

NSArray *strArray = [saveDataArray objectAtIndex:0];
 NSString *UnstrOne = [strArray objectAtIndex:0];
 NSString *UnstrTwo = [strArray objectAtIndex:1];

nsstring对象保存NSData*dataToWrite =[[NSString stringWithString:@"String to write"] dataUsingEncoding:NSUTF8StringEncoding];

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

NSString*path =[docsDirectory stringByAppendingPathComponent:@"fileName.txt"];

// Write the file

[dataToWrite writeToFile:path encoding:NSUTF8StringEncodingerror:nil];

// Read the file

NSString *stringFromFile = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncodingerror:nil];

// Check if file exists

NSFileManager*fileManager =[NSFileManager defaultManager];

[fileManager fileExistsAtPath:path];

// Returns a BOOL    

// Remove the file

[fileManager removeItemAtPath:path error:NULL];

// Cleanup

[stringFromFile release];

[fileManager release];