CODEWITHSUNDEEP
iosobjective-cuipickerview
vzm
vzm

Reputation: 2450

Show entire number value after chosen on UIPickerView?

I have a little coding problem at the moment. I have a picker with 7 different options, currently for testing purposes I have a label that will display the chosen value of the picker.

The problem that I am having is that my label is only displaying whole numbers, not displaying the entire decimal number, can someone please help me so that I can obtain the full value of the chosen item in the picker?

Here is my code :

// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [tempList count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [tempList objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)pickerView
      didSelectRow:(NSInteger)row
       inComponent:(NSInteger)component {

   CGFloat chosenValue;

    switch (row) {
        case 0:
            chosenValue = 0.0000373;
            break;
        case 1:
            chosenValue = 0.0000273;
            break;
        case 2:
            chosenValue = 0.0000233;
            break;
        case 3:
            chosenValue = 0.0000204;
            break;
        case 4:
            chosenValue = 0.0000179;
            break;
        case 5:
            chosenValue = 0.0000169;
            break;
        case 6:
            chosenValue = 0.0000142;
            break;
        default:
            chosenValue = 0;
            break;
    }

NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];
    formatter.numberStyle = NSNumberFormatterDecimalStyle;

self.testLabel.text = [formatter stringFromNumber:@(chosenValue)];


}

Upvotes: 0

Views: 265

Answers (3)

MatisDS
MatisDS

Reputation: 91

Try this : 

self.testLabel.text = [NSString stringWithFormat:@"%.10f",chosenValue];

instead of:

self.testLabel.text = [formatter stringFromNumber:@(chosenValue)];

Upvotes: 0

Simone Lai
Simone Lai

Reputation: 381

Why did you not use NSString stringWithFormat method?

self.textLabel.text = [NSString stringWithFormat:@"%.10f", chosenValue];

Upvotes: 0

rmaddy
rmaddy

Reputation: 318774

You need to specify the precision:

self.textLabel.text = [NSString stringWithFormat:@"%.7f", chosenValue];

The %f format specifier defaults to 5 decimal places.

And you probably need to change chosenValue to double to get enough significant digits.

Better yet, since you are using an NSNumberFormatter, set the number of decimals:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;
formatter.minimumFractionDigits = 7;

Upvotes: 2

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