UIPickerView with two rows - ios

Question

I am trying to make a simple converter for some unit stuff, and i can't seem to manage getting the data out of both columns and making them into a variable i can calculate with. I also get some errors, which i would really appreciate if anyone would look into. The errors are at the #pragma mark - PickerView Delegate, where i think about 90% of my code is wrong.
Here is the full .h file. (Hoping i did this the right way this time)
And here is the full project if anyone has got the time to look into it. http://www.mediafire.com/download.php?ss706o783ioa59u
#import "MainViewController.h"
#interface MainViewController ()
#end
#implementation MainViewController
#synthesize _convertFrom, _convertTo, _convertRates;
#synthesize dollarText, picker, resultLabel;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_convertFrom = #[#"Australia (AUD)", #"China (CNY)",
#"France (EUR)", #"Great Britain (GBP)", #"Japan (JPY)"];
_convertRates = #[ #0.9922f, #6.5938f, #0.7270f,
#0.6206f, #81.57f];
_convertTo = #[#"Australia (AUD)", #"China (CNY)",
#"France (EUR)", #"Great Britain (GBP)", #"Japan (JPY)"];
_convertRates = #[ #0.9922f, #6.5938f, #0.7270f,
#0.6206f, #81.57f];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
//dont forget to put something in here later
}
- (IBAction)textFieldReturn:(id)sender {
[sender resignFirstResponder];
}
#pragma mark -
#pragma mark PickerView DataSource
- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
return 2;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component
{
if (component == 0) {
return [_convertFrom count];
}
return [_convertTo count];
}
- (NSString *) pickerView: (UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
if (component == 0) {
return [_convertFrom objectAtIndex:[pickerView selectedRowInComponent:0]];
}
return [_convertTo objectAtIndex:[pickerView selectedRowInComponent:1]];
}
#pragma mark -
#pragma mark PickerView Delegate
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
float from = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0] floatValue]];
float to = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:1] floatValue]];
float input = [dollarText.text floatValue];
// This stuff is from some guide.
//float rate = [_convertRates[row] floatValue];
//float dollars = [dollarText.text floatValue];
//float result = dollars * rate;
NSString *resultString = [[NSString alloc] initWithFormat:
#"%.2f #% = %.2f %#", input, [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0] floatValue]], result, [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0] floatValue]]];
resultLabel.text = resultString;
}
#pragma mark - Flipside View
- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller
{
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"showAlternate"]) {
[[segue destinationViewController] setDelegate:self];
}
}
#end
Thanks in advance :)

Answer 1

I just looked at your code, but still have some doubts about your calculation, but your braces was wrong and please implement it like this only:
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
float from = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0]] floatValue];
float to = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:1]] floatValue];
float input = [dollarText.text floatValue];
// This stuff is from some guide.
float rate = from;
float dollars = input;
float result = dollars * rate;
NSString *resultString = [[NSString alloc] initWithFormat:
#"result = %f = %f * %f", result, dollars, rate];
resultLabel.text = resultString;
}
-(IBAction)clear
{
}

Answer 2

These two lines:
float from = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0] floatValue]];
float to = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:1] floatValue]];
should be:
float from = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0]] floatValue];
float to = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:1]] floatValue];
You have bracket in the wrong spot. And it looks like the 'resultString' line has the same problem, multiple times.