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POHow to convert a NSString to a CGFloat in Objective C?
 

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  1. POHow to convert a NSString to a CGFloat in Objective C?
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    <p>So I have been stuck for a couple of hours trying to get this to work. In my application I receive XML data, parse through it and create an image with buttons programmatically. However, when I try and convert Strings to CGFloats so that I can use them for the button coordinates it doesn't work. I have tried a few different tutorials and methods and nothing seems to work. You can see in the code below that I am trying it multiple ways. I know that the strings have the correct numbers in them, I just can't get it to convert. It comes back as Null. Help! Thanks in advance</p> <pre><code>$CGFloat buttonViewXvalue = [tempXCorrVariable floatValue]; CGFloat buttonViewYvalue = [tempYCorrVariable floatValue]; buttonViewWidth = [tempWidthCorrVariable floatValue]; buttonViewLength = [tempLengthCorrVariable floatValue]; //The "buttonView" variables are Float Variables and the "temp" Variables are Strings. NSLog(@"Float X = %@", buttonViewXvalue); NSLog(@"Float Y = %@", buttonViewYvalue); NSLog(@"Float Width = %@", buttonViewWidth); NSLog(@"Float Length = %@", buttonViewLength); </code></pre> <p>------------------------------------------ edit --------------------------------------------</p> <p>Thanks to good responses I got it to work. Turns out it was simply a formatting issue with the NSLog. Here is the new code:</p> <pre><code>$CGFloat buttonViewXvalue = [tempXCorrVariable floatValue]; CGFloat buttonViewYvalue = [tempYCorrVariable floatValue]; buttonViewWidth = [tempWidthCorrVariable floatValue]; buttonViewLength = [tempLengthCorrVariable floatValue]; NSLog(@"Float X = %f", buttonViewXvalue); NSLog(@"Float Y = %f", buttonViewYvalue); NSLog(@"Float Width = %f", buttonViewWidth); NSLog(@"Float Length = %f", buttonViewLength); </code></pre> <p>For future reference for those who want to know how to convert a String to a float or CG float...simply follow this:</p> <pre><code>CGFloat yourFloatVariable = [stringThatYouWantToConvert floatValue]; </code></pre> <p>Make sure that you use the exact word on the last part "floatValue." That isn't another variable or a value or anything, just put that in your code. </p>
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    1. COWhat do you see when you `NSLog(@"%@", tempXCorrVariable);`? Also, you're using the wrong format specifier for the floats: should be `NSLog(@"Float X = %lf", buttonViewXvalue);`. `%@` is only for objects.
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      1. POHow to convert a NSString to a CGFloat in Objective C?
      1. USJosh Caswell
    2. CO@Josh Caswell you should leave an answer. OP simply is printing using the the wrong [string format specifier](http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265-SW1).
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      1. USJoe
    3. CO@Joe: That's not the main problem -- if it's printing as `(null)`, that means the floats are `0.0`, which means there's something else wrong with the conversion. That's why I asked to see the printout of the `temp...` variables.
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