Return a float value from setting plist

Question

I've been trying to pull the value "tempF" from /var/mobile/Library/Preferences/com.skylerk99.snappref.plist to return for the float value.

-(float) temperatureDegFahrenheit {
    NSDictionary *pref = [[NSDictionary alloc]initWithContentsOfFile:@"/var/mobile/Library/Preferences/com.sky.snap.plist"];
    NSString *tempF;
    if( [[pref objectForKey:@"showF"] boolValue] ) {
        return tempF;
    }
    else {
        return %orig;
    }
}

but I keep getting the error

cannot initialize return object of type 'float' with an lvalue of type 'NSString *'
   return tempF;

What is the best way to accomplish this, because I obviously don't know?

Answer 1

Update:

Based on the discussion below, let's assume the temperature is entered through a UITextField called temperatureTextField. You can get the float value of the input temperature like this:

[[temperatureTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] floatValue];

---

The function expects you to return float, but tempF is a NSString *.

To parse float value from a NSString, try this (by the way, I assume that you did not show all your code, otherwise your tempF was never assigned):

[tempF floatValue];