For advice on naming Objective-C methods, you should turn to an Objective-C style guide such as Apple's coding guidelines for Cocoa. Any style guide that follows the conventions of the community and Apple's frameworks will suggest that you name your method such that the purpose of each parameter is clearly described within the method name.
+(NSString *)priceStringWithPrice:(double)price removeCurrencySymbol:(BOOL)removeCurrencySymbol
-(void)showHelpChoicesInView:(UIView *)view withSomethingWithAnUndecipherableName:(id)mysteryParameter
Notice the significant change in name to indicate what (I assume) it does in your program and what each parameter does. Your class method doesn't add anything to anything - rather it returns a new string. This makes your code blend naturally with that of other developers, Apple's frameworks, other libraries you may use, and enhances the readability greatly. Not naming your parameters degrades readability and makes maintainability far more difficult.
On a related note, unnecessary abbreviations, including Hungarian notation, are jarring and don't fit the style, and if you follow good naming practices you don't need them and will produce code that is a pleasure to maintain. So don't call it vw, call it view or viewToShowIn. Don't call it strVal call it valueString or somethingSpecificallyDescribingTheNatureOfTheValueString.
