I m doing a quiz application in which I have stored the correctanswer and its question Id in a NSMutableArray.I m displaying it in a section tableView.Now if I mark another answer in the same section then the prevoius have to be removed and this one has to be attached to the array.
But Im unable to get it .
NSMutableArray *cellSection = [self.finalarray objectAtIndex:indexPath.section];
int n=[cellSection count];
NSString *questionId=[[cellSection objectAtIndex:n-1]objectForKey:#"QId"];
for (NSDictionary *dict in selectedOptionandQIdArray) {
NSString *str=[dict valueForKey:#"QId"];
[arr1 addObject:str];
}
BOOL isTheObjectThere = [arr1 containsObject:questionId];
if(isTheObjectThere==YES)
{
//remove the prevoius answer and replace by the new answer for the same question id
}
[selectedOptionsArray addObject:dictionary1];
NSDictionary *dictinary2 =[[NSDictionary alloc] initWithObjectsAndKeys:questionId, #"QId", nil];
[selectedOptionsArray addObject:dictinary2];
[selectedOptionandQIdArray addObject:selectedOptionsArray];
But isTheObjectThere is always 'NO' eventhough there is same question Id.
How can I remove prevoius one and replace by the new one
id object = [[array objectAtIndex:0] retain];
[array removeObjectAtIndex:0];
[array insertObject:object atIndex:2];
Use these lines.
use replaceObjectAtIndex:withObject:. just replace your answer.like this
[selectedOptionsArray replaceObjectAtIndex:indexofrepacingElement withObject:#"newAnswer"];
Related
I found a workaround myself, but still trying to understand the problem.
I created a Autocomplete text field with the use of uitableview which is hidden until textfield is edited. The UI part works fine. It's the searching for the results part that's the problem. I declared a local NSMutableDictionary to store my results because I wanted the results to be sorted by the key's values.
if I call keysSortedByValueUsingSelector on the dictionary directly, it crashes. However if I get the keys by [dict allKeys] first, then call sortedArrayUsingSelector, it works fine:
// This commented out line will crash
// NSArray *sortedKeysArray = [dict keysSortedByValueUsingSelector:#selector(compare:)];
// The next two lines runs fine.
NSArray *keyArray = [dict allKeys];
NSArray *sortedKeysArray = [keyArray sortedArrayUsingSelector:#selector(compare:)];
Here is the complete source code for the search method:
- (void)searchAutocompleteEntriesWithSubstring:(NSString *)substring
{
// Put anything that starts with this substring into the autocompleteUrls array
// The items in this array is what will show up in the table view
[autocomplete_symbol_array removeAllObjects];
rRSIAppDelegate *appDelegate = (rRSIAppDelegate *)([[UIApplication sharedApplication] delegate]);
NSString *input_str = [substring uppercaseString];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
int i = 0;
for(SymbolInfo *symbol_info in appDelegate.m_symbol_info_array)
{
i++;
NSString *info_str = [[[symbol_info.m_symbol uppercaseString] stringByAppendingString:#"|"] stringByAppendingString:[symbol_info.m_company_name uppercaseString]];
NSUInteger pos = [info_str rangeOfString:input_str].location;
if (pos != NSNotFound)
{
int tmp = pos * 10000 + i;
NSNumber *map_key = [[NSNumber alloc] initWithInt:tmp];
[dict setObject:symbol_info forKey:map_key];
}
}
// This commented out line will crash
// NSArray *sortedKeysArray = [dict keysSortedByValueUsingSelector:#selector(compare:)];
// The next two lines runs fine.
NSArray *keyArray = [dict allKeys];
NSArray *sortedKeysArray = [keyArray sortedArrayUsingSelector:#selector(compare:)];
for (NSNumber *key in sortedKeysArray)
{
SymbolInfo *symbol_info = [dict objectForKey:key];
[autocomplete_symbol_array addObject:symbol_info];
}
// NSLog(#"everything added: %d", [autocomplete_symbol_array count]);
[autocompleteTableView reloadData];
}
The NSMutableDictionary's method is:
- (void)setObject:(id)anObject forKey:(id < NSCopying >)aKey;
This means that the key should implement the NSCopying protocol.
I am trying to use plist files to save a list of items from a text
file from a web site. When I first create the plist file and add
items to that, there is no problem. But when I try to remove an item
from plist, it is not removing the index, it only overwrites the
content of this index with NULL. And I tried an other way; I tried to
create a new array without the item I want to remove, and overwrite
plist file with the content of this new array. In this way, the item
I wanted to remove is removed, but surprisingly the first item gets
NULL! A more surprising situation is, I also write it to a new plist
file with same technique, and it is perferct! This is a very
primitive code, unfortunately it didn't worked for me. I searched
plenty of tutorials, but I couldn't overcome. How can I write the
content of a string array to a plist file without extra null objects
and without loosing datas?
========================================================================
I composed a sample code below :
- (IBAction)logFromPlist{
NSMutableArray *arr = [[NSMutableArray alloc] initWithContentsOfFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"]];
NSLog(#"LOG:");
NSLog(#"arrplist count : %d", [arr count]);
for(int a=0; a<[arr count]; a++){
NSLog(#"*** %#", [arr objectAtIndex:a]);
}
}
- (IBAction)logFromPlist2{
NSMutableArray *arr = [[NSMutableArray alloc] initWithContentsOfFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data3.plist"]];
NSLog(#"LOG:");
NSLog(#"arrplist count : %d", [arr count]);
for(int a=0; a<[arr count]; a++){
NSLog(#"*** %#", [arr objectAtIndex:a]);
}
}
- (IBAction)addValue{
NSString *deger = [field5 text]; //New value text field in IB
NSMutableArray *arr = [[NSMutableArray alloc] initWithContentsOfFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"]];
if(arr == NULL){
arr = [[NSMutableArray alloc] init];
}
[arr addObject:deger];
[arr writeToFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"] atomically:NO];
}
- (IBAction)removeFromPlist{
NSMutableArray *arr2 = [[NSMutableArray alloc] initWithContentsOfFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"]];
if(arr2 != NULL){
NSMutableArray *arr = [[NSMutableArray alloc] init];
NSString *key = [field8 text];
for(int i = 0; i < [arr2 count]; i++){
NSString *cntStr = [[NSNumber numberWithInt:i] stringValue];
if(![cntStr isEqualToString:key]){
NSString *tempDeger = [arr2 objectAtIndex:i];
if(tempDeger != NULL){
[arr addObject:tempDeger];
}else{
NSLog(#"it is NULL");
}
}
}
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"] error:nil]; //I tried this line by removing next line
[arr writeToFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"] atomically:NO]; //It is writing the array to plist but first item is always null
[arr writeToFile:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data3.plist"] atomically:NO]; //same technique but everything is ok in this plist
[fileManager copyItemAtPath:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data3.plist"] toPath:[NSHomeDirectory() stringByAppendingPathComponent:#"Documents/data2.plist"] error:nil]; // trying to copy correct plist file (data3.plist) to original plist file (plist2), but it does not fix the problem.
}
}
Project file : http://www.ozgunbursalioglu.com/files/plistWork.zip
At least your copyItemAtPath: will always fail since it won't overwrite files (data2.plist already exists).
Try to write your file by setting the automatically to YES
[arr writeToFile:PATH atomically:YES];
And also try to check the BOOL value returned to see if your oerration done successfully
i have the following code
inAppKeys = [[MKStoreManager sharedManager] purchasableObjectsDescription ];
NSMutableArray * unremovableArray = [[NSMutableArray alloc] init];
for(int i = 0; i<[inAppKeys count]; i++){
for (int j=0; j< [categories count]; j++) {
NSString * inAppKey = [[categories objectAtIndex:j] valueForKey:#"inAppKey"];
if([inAppKey isEqualToString: [inAppKeys objectAtIndex:i]]){
[unremovableArray addObject:[categories objectAtIndex:j]];
}
}
}
categories = [[NSMutableArray alloc] init];
[categories addObjectsFromArray:unremovableArray];
where categories is nsmutablearray .. the thing is addObjectsFromArray leave the categories empty .. what do i do wrong?
Looks to me like you're referring to [categories count] and [categories objectAtIndex:j] before you even alloc/init categories.
Having re-read your title ("reinitializing") which suggests you've previously inited categories, I'm now assuming that you have a master set of categories that you're trying to reduce to the ones actually purchased. If so, I wouldn't re-use the variable "categories" as that's confusing. (I assume categories was auto-released, or else you've got a leak). How 'bout using unremovableArray instead of leaking it?
I'd also use fast enumerators for clarity and speed...
NSLog(#"categories: %#", categories);
inAppKeys = [[MKStoreManager sharedManager] purchasableObjectsDescription ];
NSLog(#"inAppKeys:%#", inAppKeys);
NSMutableArray * unremovableCategories = [[NSMutableArray alloc] init];
for(NSString* thisAppKey in inAppKeys) {
for (NSDictionary* thisCategory in categories) {
if ([[thisCategory valueForKey:#"inAppKey"] isEqualToString: thisAppKey]){
[unremovableCategories addObject:thisCategory];
break; //having added this category; no reason to continue looking at it
}
}
}
//now use unremovableCategories...
quick question regarding Array's in xcode. I have ht efollowing code, which is supposed to go through an array of strings which it has got through php and JSON, and trun these strings into a custom object with the strings as the ivars for the object then add that object to a new array:
for (int i = 0; i<[list count]; i++) {
Article *article = [[Article alloc] init]; //creates custom object
article.uid = [[list objectAtIndex:i] objectAtIndex:0];
article.title = [[list objectAtIndex:i] objectAtIndex:1]; //adds string as ivars
article.description = [[list objectAtIndex:i] objectAtIndex:2];
articleArray = [[NSMutableArray alloc] init]; //inits the new array
[articleArray addObject:article]; //should add the object but seems to fail
[article release]; //releases the object
NSLog(#"%#", article.description);
}
NSLog(#"%d", [articleArray count]);
NSLog([articleArray description]);
}
The code does return the correct values using NSLog(#"%#", article.description); but not the correct length for the new array and it only adds one value to the array which is the string for article.description which makes no sense to me. The list array contains 2 elements each of which are arrays in themselves containing the strings.
You're recreating the articleArray in every loop. Declarate it outside, and it will work:
NSMutableArray *articleArray = [[NSMutableArray alloc] init]; //inits the new array
for (int i = 0; i<[list count]; i++) {
Article *article = [[Article alloc] init]; //creates custom object
article.uid = [[list objectAtIndex:i] objectAtIndex:0];
article.title = [[list objectAtIndex:i] objectAtIndex:1]; //adds string as ivars
article.description = [[list objectAtIndex:i] objectAtIndex:2];
[articleArray addObject:article]; //should add the object but seems to fail
[article release]; //releases the object
NSLog(#"%#", article.description);
}
NSLog(#"%d", [articleArray count]);
NSLog([articleArray description]);
}
You also may want to use the nicer for(NSArray *listElement in list) syntax instead.
My iPhone application has a UITable View implemented with search functionality in it. The values in the table are grouped into sections from A-Z. Whenever a user tap on particular cell in the table it loads a detail view controller which gives all the values of that particular user. Now my problem is whenever I search some contact and tap on a particular user to check his detail view it always returns a contact starting with letter A. So, my doubt is how to implement this search functionality. Is there a way to get the name of the contact I tapped..Please check this screenshot.. For example if I search some contact starting with letter 'B' and tap on that contact it loads the detail view of a contact starting with letter 'A'. I get all the values from the database. Can you please help me out...
This is the code:
The code I wrote here is in a method:
I am getting all the contacts from database and assigning to an array contacts. Then I am grouping all the contacts according to the alphabets and grouping everything into a dictionary with keys as A-Z and values as name of contacts starting with these letters. Now when I search for a particular contact his name may start with either A ,B or Z..so in the search bar when I search for a particular contact for example a contact starting with letter Z, in this case it gives the details of a person with A. I want this to change so that whenever I tap on a particular contact it should load its details. I am unable to figure out how to do it..
contacts = [[db getContacts:#"Contacts"] componentsSeparatedByString:#","];
[db cleanup];
NSMutableArray *tempArray = [[NSMutableArray alloc] init];
NSString *charString;
for (int i=65; i<91; i++) {
charString = [NSString stringWithFormat:#"%c",(char *)i];
[tempArray addObject:charString];
}
[charString release];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
for (int i=0; i<[tempArray count]; i++) {
NSMutableArray *contactsByIndex = [[[NSMutableArray alloc] init]autorelease];
NSString *tempChar = [tempArray objectAtIndex:i];
for (int j=0; j<[contacts count]-1; j++)
{
NSString *test = [contacts objectAtIndex:j];
NSString *tempString = [test substringToIndex:1];
if ([tempString isEqualToString:tempChar]) {
[contactsByIndex addObject:[contacts objectAtIndex:j]];
}
}
[dict setObject:contactsByIndex forKey:[tempArray objectAtIndex:i]];
}
self.contactNames = dict;
NSArray *array = [[contactNames allKeys] sortedArrayUsingSelector:#selector(caseInsensitiveCompare:)];
self.contactKeys = array;
[dict release];
[tempArray release];
//---display the searchbar---
self.tableView.tableHeaderView = searchBar;
searchBar.autocorrectionType = UITextAutocorrectionTypeYes;
listOfContacts = [[NSMutableArray alloc] init];
for (NSString *key in array)
{
NSArray *contactsArray = [contactNames objectForKey:key];
for (NSString *name in contactsArray) {
[listOfContacts addObject:name];
}
}
- (void) searchContactsTableView {
//---clears the search result---
[searchResult removeAllObjects];
for (NSString *str in listOfContacts) {
NSRange titleResultsRange = [str rangeOfString:searchBar.text options:NSCaseInsensitiveSearch];
if (titleResultsRange.length > 0)
[searchResult addObject:str];
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
NSString *selectedRow=nil;
if (isSearchOn) {
selectedRow=[searchResult objectAtIndex:indexPath.row];
}
DetailViewController *detailViewController;
int section_index=[indexPath indexAtPosition:[indexPath length]-2];
int sugarid_Index = [indexPath indexAtPosition: [indexPath length]-1];
NSString* sectionName=[contactKeys objectAtIndex:section_index];
NSLog(#"%#",sectionName);
//This is a method which gets the details of a particular contact based on the section and the row selected..Contacts is the table name
NSString *getContact=[db getId:#"Contacts" bySection:sectionName andIndex:sugarid_Index];
id=[db getContact:#"Contacts" id:getContact];
// Pass the selected object to the new view controller.
detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
detailViewController.eachContact=contactForSugarId;
[self.navigationController pushViewController:detailViewController animated:YES];
}
When I search for a contact it should search for the name in database and should return its details. Is there a way to do it..please let me know or is there a way to get the name of the cell i.e. the contact name so that I can use that in one of my database methods to retrieve the details of the contact I selected.
Off hand it sounds like you're looking in the wrong array of contacts after the search. You need to have two arrays. One with all the contacts, and one with the filtered contacts. When you search, put all the results in order in the filtered list, and pull the details from that one.
Does this make sense?
If not, try posting a bit of code, and explaining your structure.