Retrieve UITextfField values and convert to inches with decimal?

If I have formatting for a textfield like:

//Formats the textfield based on the pickers.
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

NSString *result = [feetArray objectAtIndex:[feetPicker selectedRowInComponent:0]];

result = [result stringByAppendingFormat:@"%@ft", [feetArray objectAtIndex:[feetPicker selectedRowInComponent:1]]];
result = [result stringByAppendingFormat:@" %@", [inchArray objectAtIndex:[inchesPick开发者_Python百科er selectedRowInComponent:0]]];
result = [result stringByAppendingFormat:@"%@", [inchArray objectAtIndex:[inchesPicker selectedRowInComponent:1]]];
result = [result stringByAppendingFormat:@" %@in", [fractionArray objectAtIndex:[fractionPicker selectedRowInComponent:0]]];

myTextField.text = result;
}

Which display's in the textfield like 00ft 00 0/16in How can I change that all to inches with decimal? I'll need to take the ft, and multiply by 12 = variable.Then add that to inches, as well as take my fraction 1/16 and divide that by 16 to get my decimal value and then add that to the inches so it shows like 1234.0625 in order to make my calculation. Can someone help me accomplish this? Thank you in advance!

NSString * theString = RiseTextField.text;
NSString * feetString = [theString substringWithRange:NSMakeRange(0, 2)];
NSString * inchesString = [theString substringWithRange:NSMakeRange(5, 2)];
NSUInteger rangeLength = ([theString length] == 14) ? 1 : 2;
NSString * fractionString = [theString substringWithRange:NSMakeRange(8, rangeLength)];

double totalInInches = [feetString doubleValue] * 12 + [inchesString doubleValue] + [fractionString doubleValue] / 16;

You can easily get the number that you want by doing the calculations with the numbers you have there. Once you've got the actual number, you should use a NSNumberFormatter to present it with the desired amount of decimals and format.

This should solve your problem. Or did you need help converting the strings to numbers so that you can add them together?