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POWhat is the best way to save/retrieve array in iOS Programming
 

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  1. POWhat is the best way to save/retrieve array in iOS Programming
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    <p>i have an array of results based on calculation(with different formulae) of other array input by the user. i want to save the array as user clicks on "save results" button. Also if he again enters array, the next results array should be saved separately so that there be a mutable array of result arrays. </p> <p>There are three table views in my app</p> <ol> <li>User entries table through text fields</li> <li>Results titles( All Previous and the last results) </li> <li>Detail results table (eg results on a particular day)</li> </ol> <p>i've used NSUserdefaults for this and it saved successfully but when i again enters the entries array then results array override the previous results array i want to know what is the way to do this( through NSUserdefaults only).</p> <p>Could anybody clarify the "right" way to do this with a concrete code example? Thanks</p> <p>ok here is piece of my code in view did load</p> <pre><code>resultsDict = [[NSMutableDictionary alloc] init]; </code></pre> <p>table view methods.</p> <pre><code>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSArray *array = [results objectAtIndex:section]; return [array count]; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return [results count ]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell=nil; if (cell == nil) { cell = [[[MedicalAirSizingResultsCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } cell.selectionStyle = UITableViewCellSelectionStyleNone; //switch for calculating the result values for current section switch ( indexPath.section) { case 0: //switch to get the current result value switch (indexPath.row) { case 0: resultValue = [self Altitude_above_sea_level]; break; case 1: resultValue = [self Intake_air_temperature]; break; case 2: resultValue = [self Relative_Humidity]; break; } break; case 1: switch (indexPath.row) { case 0: resultValue = [self System_Model]; break; case 1: resultValue = [self Horsepower]; break; case 2: resultValue = [self System_Capacity]; break; ....and so on case 8: resultValue = [self R_Suggd_Specs]; break; } break; } //nsdictionary to add in nsuserdefaults [vaccumResultsDict setObject:[NSNumber numberWithInt:resultValue] forKey:[NSString stringWithFormat:@"%d%d",indexPath.section, indexPath.row]]; NSArray *array = [results objectAtIndex:indexPath.section]; if ([indexPath section]== 3 &amp;&amp; [indexPath row] == [array count]) { UIButton *btnShowResults = [UIButton buttonWithType:UIButtonTypeRoundedRect]; btnShowResults.opaque=YES; [btnShowResults setBackgroundColor:[UIColor clearColor]]; [btnShowResults setBackgroundImage:[UIImage imageNamed:@"ShowResults.png"] forState:UIControlStateNormal]; [btnShowResults setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; btnShowResults.frame = CGRectMake(0, 0, 320,40); [btnShowResults addTarget:self action:@selector(showVaccumSizingSavedResults)forControlEvents:UIControlEventTouchDown]; [cell addSubview:btnShowResults]; } else{ NSString *str = [array objectAtIndex:indexPath.row]; [(VaccumSizingResultsCell *)cell setData:str andResult:resultValue]; } return cell; } </code></pre> <p>//this method will be called when user taps on save resutls button which is in last row of last section -(void)showVaccumSizingSavedResults{</p> <pre><code> NSUserDefaults *savedVaccumResultDefaults = [NSUserDefaults standardUserDefaults]; NSMutableArray *savedResultsArray = [[NSMutableArray alloc]init]; [savedResultsArray addObject:vaccumResultsDict]; [vaccumResultsDict release]; [savedVaccumResultDefaults setObject:savedResultsArray forKey:@"savedVaccumSizingResultsKey"]; [savedVaccumResultDefaults synchronize]; GetResult *saveCurrentResult = [[GetResult alloc]initWithNibName:@"GetResult" bundle:nil]; [self.navigationController pushViewController:saveCurrentResult animated:YES]; } </code></pre>
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    1. USDeepak Singh Negi
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