Question

local declaration hides instance variable message popup near “self.treatmentId = treatmentId;” and “self.treatmentName = treatmentName;”;

@implementation Treatment

@synthesize treatmentId;
@synthesize treatmentName;

-(Treatment *)initWithtreatmentName:(NSString *)treatmentName treatmentId:(NSString *)treatmentId{


    if((self = [super init])){
        self.treatmentId = treatmentId;
        self.treatmentName = treatmentName;
    }

    return self;

 }

@end

Answer 1

Change your code to the following.

@implementation Treatment

@synthesize treatmentId;
@synthesize treatmentName;

-(Treatment *)initWithtreatmentName:(NSString *)newTreatmentName treatmentId:(NSString  *)newTreatmentId{


    if((self = [super init])){
        self.treatmentId = newTreatmentId;
        self.treatmentName = newTreatmentName;
    }

    return self;

 }

@end

By declaring the local variable trentmentName and treatmentId you are essentially losing the ability to access the global (iVars) via their names.