NSUserdefault使用和writeTofile使用例子

• (void)viewDidLoad {
  [super viewDidLoad];
  if ([self saveDataDemo]) {
  NSLog(@”保存成功”);
  }
  if ([[NSUserDefaults standardUserDefaults] objectForKey:@”message”]==nil) {
  [[NSUserDefaults standardUserDefaults] setObject:@”This is my default message” forKey:@”message”];
  }
  NSDictionary *defaults = [[NSUserDefaults standardUserDefaults] dictionaryRepresentation];
  NSLog(@”Defaults: %@”,defaults);
  // Do any additional setup after loading the view, typically from a nib.
  }

pragma -plist cache

-(BOOL)saveDataDemo{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *loginFilePath = [documentsDirectory stringByAppendingString:@”Login.txt”];
NSString *textField = @”尝试写入”;
BOOL result = [ textField writeToFile:loginFilePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
return result;
}