Using a for loop for a UIPickerView - ios

Question

I am new here and I am getting my hands dirty on some iPhone applications on XCODE. I am currently creating an app but I am stuck on a particular part that involves a pickerview. Here's the code.
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
if ([pickerView tag] == 0){
return [firstColumn count];
}
else if ([pickerView tag] == 1){
return [OnFirstMin count];
return [OnSecMin count];
return [OnSecSec count];
return [OnFirstSec count];
}
else {
return [OffFirstMin count];
return [OffSecMin count];
return [OffFirstSec count];
return [OffSecSec count];
}
return 0;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
if([pickerView tag] == 0){
if(component == FIRST){
return [firstColumn objectAtIndex:row];
}
}
else if ([pickerView tag] == 1){
if(component == ON1){
return [OnSecMin objectAtIndex:row];
}
else if (component == ON2){
return [OnFirstMin objectAtIndex:row];
}
else if (component == ON3){
return [OnSecSec objectAtIndex:row];
}
else {
return [OnFirstSec objectAtIndex:row];
}
}
else {
if(component == OFF1){
return [OffSecMin objectAtIndex:row];
}
else if (component == OFF2){
return [OffFirstSec objectAtIndex:row];
}
else if (component == OFF3){
return [OffSecSec objectAtIndex:row];
}
else {
return [OffFirstSec objectAtIndex:row];
}
}
return 0;
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
if ([pickerView tag] == 0){
if(sets == TRUE && reps != TRUE){
numofsets = row;
SetsTextField.text = [firstColumn objectAtIndex:row];
}
else{
numofreps = row;
RepsTextField.text = [firstColumn objectAtIndex:row];
}
}
else if ([pickerView tag] == 1){
if(component == ON1){
onsecmin = row;
}
else if (component == ON2){
onfirstmin = row;
}
else if (component == ON3){
onsecsec = row;
}
else {
onfirstsec = row;
}
}
else {
if (component == OFF1){
offsecmin = row;
}
else if (component == OFF2){
offfirstmin = row;
}
else if (component == OFF3){
offsecsec = row;
}
else {
offfirstsec = row;
}
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
firstColumn = [[NSMutableArray alloc] init];
for(i=0; i<=30; i++){
[firstColumn addObject: [NSString stringWithFormat:#"%d", i]];
}
OnSecMin = [[NSMutableArray alloc] init];
OnFirstMin = [[NSMutableArray alloc] init];
for(j=0; j<60; j++){
[OnSecMin addObject:[NSString stringWithFormat:#"%i", j]];
[OnFirstMin addObject: [NSString stringWithFormat:#"%i", j]];
}
OnSecSec = [[NSMutableArray alloc] init]; //Part where I need help.
k =0;
while (k<60){
[OnSecSec addObject: [NSString stringWithFormat:#"%i",k]];
k = k+15;
}
PickerViewSetsRepsContainer.frame = CGRectMake(0, 600, 320, 206);
PickerViewOnContainer.frame = CGRectMake(0, 610, 320, 206);
PickerViewOffContainer.frame = CGRectMake(0, 620, 320, 206);
}
So, for OnSecSec, I want the rows to display 0, 15, 30, and 45 for that component. However, when I run it, the application is aborted. However, when I change that part to a for loop like I did for OnSecMin and OnFirstMin, it works. How come I can't use a while loop like above? Also, can someone help me with this dilemma? Thank you very much for your assistance in advance!

Answer 1

try this
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return 1050;
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
NSString *arrayName = [[NSString alloc] initWithFormat:#"column%d", component];
NSArray *array = [self valueForKey:arrayName];
[arrayName release];
UIImage *image = [array objectAtIndex:row%7];
if (!view){
view = [[[UIImageView alloc] init] autorelease];
}
[(UIImageView*)view setImage:image];
return view;
}