Objective-C convention to prevent “local declaration hides instance variable” warning

Question

I am using the following code ...

-(id) initWithVariableName:(NSString*)variableName withComparisonValue:(NSString*)comparisonValue {

    // super init
             


        

Answer 1

This is not a problem at all in the modern Objective-C. In the modern Objective-C, properties are automatically synthesized and their corresponding instance variables get a _ prefix.

So, with auto-synthesis your properties would create instance variables _variableName and _comparisonValue. No shadowing occurs in this case.

More info in this blog post

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If you absolutely need to manually synthesize your properties, rename the sinthesized ivar like this

@synthesize variableName = _variableName;

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In general case, rename your method arguments.