How to convert a string to float? [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Convert string to float in Objective-C

I'd like to convert a string to a float.

/* dict is an NSDictionary to load Preferences */ 
NSString *str = [dict objectForKey:@"key"];

This is where I got. Now I'd like to convert the string 开发者_运维百科value (in this case @"32.0f") in a float, where it could be processed by my application. How can I do this?

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CGFloat strFloat = (CGFloat)[str floatValue];

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Just pass the message floatValue to the NSString object. NSString::floatValue