How to get selected row's title and value in uipickerview? - ios

Question

in my iphone project i need to get data from sqlite and show it on uipickerview then with selected row's value i need to fill another uipickerview
in my table T_REGION there is two columns ID and NAME
this is how i get REGION list
- (NSArray*) getRegions
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"select ID,NAME from T_REGION"];
const char *query_stmt = [querySQL UTF8String];
NSMutableArray *resultArray = [[NSMutableArray alloc]init];
if (sqlite3_prepare_v2(database,
query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *name = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 1)];
[resultArray addObject:name];
}
sqlite3_reset(statement);
return resultArray;
}
else
{
NSLog(#"problem");
}
}
return nil;
}
as you see i cant fill ID column to array only name column returns i need ID column to fill another uipickerview (you may think as country - city relationship)
this is my first problem
now this is how i fill my pickerview
first in viewDidLoad method i get array:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[self getdata];
}
- (void)getdata {
dataRegion = [[NSArray alloc] initWithArray: [[DBHelper getSharedInstance:#"2_program.db"]getRegions]];
}
and my uipickerview delegate methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (pickerView.tag == 1)
return [dataRegion count];
else
return 0; //[countryTypes count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (pickerView.tag == 1)
return [dataRegion objectAtIndex:row];
else
return #"";
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent: (NSInteger)component
{
if (pickerView.tag == 1) {
NSString *categoryType = [dataRegion objectAtIndex:[pickerView selectedRowInComponent:0]];
[btnBolge setTitle:categoryType forState:UIControlStateNormal];
}else {
}
}
what i want is what select option tag do in html. i need 2 columns but show only 1 and get the selected row's value not text
1- how can i return 2 columns in getRegions function?
2- how can i show only name column in uipickerview and get its selected row's id column?

Answer 1

Try This.. May be help full..
Like this you can add both array as dictionary
NSMutableArray *nameArray = [[NSMutableArray alloc]initWithObjects:#"Come",#"Say",#"Go", nil];
NSMutableArray *regionArray = [[NSMutableArray alloc]initWithObjects:#"Hi",#"Hello",#"Bye", nil];
NSMutableArray *mainArray = [[NSMutableArray alloc]init];
for (int index = 0; index<regionArray.count; index++) {
NSMutableDictionary *dataAddDic = [[NSMutableDictionary alloc]init];
[dataAddDic setValue:[nameArray objectAtIndex:index] forKeyPath:#"name"];
[dataAddDic setValue:[regionArray objectAtIndex:index] forKeyPath:#"region"];
[mainArray addObject:dataAddDic];
}
NSLog(#"Data Print %#",mainArray);
After you need to change you delegate functions
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (pickerView.tag == 1)
return [mainArray count];
else
return 0; //[countryTypes count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (pickerView.tag == 1)
return [[mainArray objectAtIndex:row] valueForKey:#"region"];
else
return #"";
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent: (NSInteger)component
{
if (pickerView.tag == 1) {
NSString *categoryType = [[mainArray objectAtIndex:row] valueForKey:#"name"];
[btnBolge setTitle:categoryType forState:UIControlStateNormal];
}else {
}
}

Answer 2

const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"select ID,NAME from T_REGION"];
const char *query_stmt = [querySQL UTF8String];
NSMutableArray *resultArray = [[NSMutableArray alloc]init];
if (sqlite3_prepare_v2(database,query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *id = [[NSString alloc] initWithUTF8Strin
(const char *) sqlite3_column_text(statement, 0)];
NSString *name = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 1)];
NSDictionary *dict = #{id:name};
[resultArray addObject:dict];
}
sqlite3_reset(statement);
return resultArray;
}
else
{
NSLog(#"problem");
}
}
return nil;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (pickerView.tag == 1){
NSDictionary *region = [dataRegion objectAtIndex:row];
NSArray *keys = [region allKeys];
return region[[keys[0]];
}
else{
return #"";
}
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent: (NSInteger)component
{
if (pickerView.tag == 1) {
NSDictionary *region = [dataRegion objectAtIndex:row];
NSArray *keys = [region allKeys];
[btnBolge setTitle:region[keys[0]] forState:UIControlStateNormal];
}else {
}
}