iOS uipickerview output help.

    int sourceUnit = [pickerView selectedRowInComponent:0]];
    NSString *sourceUnitName = [breadTypes objectAtIndex: sourceUnit];

    int destUnit = [pickerView selectedRowInComponent:1]];
    NSString *destUnitName = [fillingTypes objectAtIndex: destUnit];

    float resultValue = <insert your calculation here>
    NSString *result = [NSString stringWithFormat: @"One %@ equals %.2f %@", sourceUnitName, destUnitName, resultValue];

johnnyfla123 said:

Alright So i am experimenting with uipickerviews to learn more about Xcode and develop a simple app. I have everything the way i want it except one thing the outputs. The way i have it setup is it will provide the output using label. I can get it to give an output but i need it to give an output based on the selection and i am now stuck at a dead end here.


the app converts quantities like grams to oz, pound to gram, etc. I want to simple make it so its like this: in component 1 you select grams. then in component 2 you select pounds. and the output would be: " 1 pound is equal to 453 grams" and it would display this text on the output label I have the label linked and setup so it can give outputs its jut the actual code i cant figure out without messing up.

here is my .h:

Code:

#import <UIKit/UIKit.h>
#define kFillingComponent  0
#define kBreadComponent  1


@interface FirstViewController : UIViewController
<UIPickerViewDelegate, UIPickerViewDataSource>{
    IBOutlet UIPickerView *doublePicker;
    NSArray *fillingTypes;
    NSArray *breadTypes;
}

@property (nonatomic,retain)  UIPickerView *doublePicker;
@property (nonatomic,retain)  NSArray *fillingTypes;
@property (nonatomic,retain)  NSArray *breadTypes;
@property (nonatomic,retain)  IBOutlet UILabel *OutputLabel;

@end

and my .m

Code:

#import "FirstViewController.h"
#import "NewViewController.h"

@implementation FirstViewController

@synthesize doublePicker;
@synthesize fillingTypes;
@synthesize breadTypes;
@synthesize OutputLabel;


// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
	NSArray *breadArray = [[NSArray alloc] initWithObjects:
                           @"1 Gram",@"1/8 Ounce",@"1/4 Ounce",@"1/2 Ounce",@"1 Ounce",@"1/4 Pound",@"1 Pound",nil];
   	self.breadTypes = breadArray;
	[breadArray release];
	
	NSArray *fillingArray = [[NSArray alloc] initWithObjects:
                             @"1Gram",@"1/8 Ounce",@"1/4 Ounce",@"1/2 Ounce",@"1 Ounce",@"1/4 Pound",@"1 Pound",nil];
	self.fillingTypes = fillingArray;
	[fillingArray release];
	[super viewDidLoad];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)didReceiveMemoryWarning {
	// Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
	
	// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [self setOutputLabel:nil];
}


- (void)dealloc {
	[doublePicker release];
	[breadTypes release];
	[fillingTypes release];
    [super dealloc];
}


-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
	return 2;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
	if (component == kBreadComponent)
		return[self.breadTypes count];
    return[self.fillingTypes count];
}

-(NSString *)pickerView:(UIPickerView *)pickerView
            titleForRow:(NSInteger)row
           forComponent:(NSInteger)component
{
	if (component == kBreadComponent)
    return [self.breadTypes objectAtIndex:row];
	return [self.fillingTypes objectAtIndex:row];
}

-(void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    
    NSString *breadTypesSelected = [breadTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
    NSString *fillingTypesSelected = [fillingTypes objectAtIndex:[pickerView selectedRowInComponent:1]];
    
    if(breadTypesSelected == 0 && fillingTypesSelected == 0){[OutputLabel setText:[NSString stringWithFormat:@"test"]];}
    else if(breadTypesSelected == 0 && fillingTypesSelected == 0){[OutputLabel setText:[NSString stringWithFormat:@"test2"]];}
    
        
}


@end

i tired many different ways but i cant seem to get it. sorry for the long post i just want to be as clear as possible of what I'm trying to accomplish.

Thanks in advance

Click to expand...

johnnyfla123 said:

alright so i plugged it in and changed what xcode wanted to. i don't know if

Code:

 if(sourceUnit == 0 && destUnit == 0){[OutputLabel setText:[NSString stringWithFormat:@"test"]];}

was supposed to stay or not so i left it and modified it to match your stuff.

Code:

    int sourceUnit = [pickerView selectedRowInComponent:0];
    NSString *sourceUnitName = [breadTypes objectAtIndex: sourceUnit];
    
    int destUnit = [pickerView selectedRowInComponent:1];
    NSString *destUnitName = [fillingTypes objectAtIndex: destUnit];
    
    float resultValue = destUnit * sourceUnit;
    NSString *result = [NSString stringWithFormat: @"One %@ equals %@ %f", sourceUnitName, destUnitName, resultValue];
    
    if(sourceUnit == 0 && destUnit == 0){[OutputLabel setText:[NSString stringWithFormat:@"test"]];}

I'm sure i did the calculation part wrong. i just cant grasp how to get each value to give a specific text output. I cant even find an example that fits what i'm trying to do here. Ive seen it done on an app so i know its entirely possible.

Click to expand...

float conversion_factor = table[sourceUnit][destUnit];
result_value = 1 * conversion_factor;  //Convert 1 source unit to destination units.

johnnyfla123 said:

what my plan was to just make it so when you choose row 1 of component 1 and row 1 of component 2 you would get a text output that i would simply put the calculate and keep going in those combo's 1 2, 2 2, 1 3, etc.

Click to expand...

johnnyfla123 said:

if you chose row 1 on component 1 and row 1 on compnent 2 it would give you a text output defined. if you chose row 2 of c1 and row 1 of c2 if would give you a different text output defined. if you choose row 1 of c1 and row 2 of c2 it would give you the same text output as row 2 of c1 and row 1 of c2.

c1 is component 1 and c2 is component 2. I thought doing this part would be the easiest lol

Click to expand...

int switchValue = C1 * 100 + C2;

C1  C2   result
--   --    ------
0     0    0
0     1    1
0     2    2
1     0    100
1     1    101
1     2    102
...
3     0    300
3     1    301

johnnyfla123 said:

finally got it figured out. thank you again for your help i found it was simple then i though

Code:

    int sourceUnit = [pickerView selectedRowInComponent:0];
    int destUnit = [pickerView selectedRowInComponent:1];
    
    if(sourceUnit == 1 && destUnit == 1){[OutputLabel setText:[NSString stringWithFormat:@"test"]];}

Click to expand...

johnnyfla123 said:

i used this and it worked perfectly

Code:

if(sourceUnit == 0 && destUnit == 0){[OutputLabel setText:[NSString stringWithFormat:@""]];}
    else if (sourceUnit == 1 && destUnit == 1){[OutputLabel setText:[NSString stringWithFormat:@"1 Gram is equal to 1 Gram"]];}

Click to expand...

if(sourceUnit == 0 && destUnit == 0)
{
  [OutputLabel setText:[NSString stringWithFormat:@""]];
}
else if (sourceUnit == 1 && destUnit == 1)
{
  [OutputLabel setText:[NSString stringWithFormat:@"1 Gram is equal to 1 Gram"]];
}

[OutputLabel setText:[NSString stringWithFormat:@"1 Gram is equal to 1 Gram"]];

[OutputLabel setText: @"1 Gram is equal to 1 Gram"];