【iOS】Plist 存取

 

• 參考 Property List Tutorial – using plist to store user data, 以下截取重要部分.
• 建立 Data.plist 放在 Resources 底下
  
• 宣告
  

  @interface PlistTutorialViewController : UIViewController {     IBOutlet UITextField    *nameEntered;     IBOutlet UITextField    *homePhone;     IBOutlet UITextField    *workPhone;     IBOutlet UITextField    *cellPhone;         NSString        *personName;     NSMutableArray    *phoneNumbers; } @property (nonatomic, retain)    UITextField        *nameEntered; @property (nonatomic, retain)    UITextField        *homePhone; @property (nonatomic, retain)    UITextField        *workPhone; @property (nonatomic, retain)    UITextField        *cellPhone; @property (nonatomic, retain)    NSString        *personName; @property (nonatomic, retain)    NSMutableArray    *phoneNumbers; - (IBAction) saveData; - (IBAction) textFieldReturn:(id)textField;

• 讀取
  

  - (void)viewDidLoad {     [super viewDidLoad];     // Data.plist code     // get paths from root direcory     NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);     // get documents path     NSString *documentsPath = [paths objectAtIndex:0];     // get the path to our Data/plist file     NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];         // check to see if Data.plist exists in documents     if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath])     {         // if not in documents, get property list from main bundle         plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];     }         // read property list into memory as an NSData object     NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];     NSString *errorDesc = nil;     NSPropertyListFormat format;     // convert static property liost into dictionary object     NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization                                           propertyListFromData:plistXML                                           mutabilityOption:NSPropertyListMutableContainersAndLeaves                                           format:&format                                           errorDescription:&errorDesc];     if (!temp)     {         NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);     }     // assign values     self.personName = [temp objectForKey:@"Name"];     self.phoneNumbers = [NSMutableArray arrayWithArray:[temp objectForKey:@"Phones"]];     // display values     nameEntered.text = personName;     homePhone.text = [phoneNumbers objectAtIndex:0];     workPhone.text = [phoneNumbers objectAtIndex:1];     cellPhone.text = [phoneNumbers objectAtIndex:2]; }

• 寫入
  

  - (IBAction) saveData {     // get paths from root direcory     NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);     // get documents path     NSString *documentsPath = [paths objectAtIndex:0];     // get the path to our Data/plist file     NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];         // set the variables to the values in the text fields     self.personName = nameEntered.text;     self.phoneNumbers = [[NSMutableArray alloc] initWithCapacity:3];     [phoneNumbers addObject:homePhone.text];     [phoneNumbers addObject:workPhone.text];     [phoneNumbers addObject:cellPhone.text];         // create dictionary with values in UITextFields     NSDictionary *plistDict = [NSDictionary                                dictionaryWithObjects:                                [NSArray arrayWithObjects: personName, phoneNumbers, nil]                                forKeys:[NSArray arrayWithObjects: @"Name", @"Phones", nil]];         NSString *error = nil;     // create NSData from dictionary     NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict                                                                    format:NSPropertyListXMLFormat_v1_0                                                          errorDescription:&error];         // check is plistData exists     if(plistData)     {         // write plistData to our Data.plist file         [plistData writeToFile:plistPath atomically:YES];     }     else     {         NSLog(@"Error in saveData: %@", error);         [error release];     } }