COSC$4355/6355$ $Introduction$to$Ubiquitous$Computing$ Exercise$3$ September!17,!2015!

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1 COSC4355/6355 IntroductiontoUbiquitousComputing Exercise3 September17,2015 Objective Inthisexercise,youwilllearnhowtowriteunittestsforyourapplicationandalsohowtouse NSUserDefaults.WewillalsoimplementObjectiveCCcategories*welearntlastweek. Motivation Testingyourprojectsenhancesrobustness,reducesbugs,andspeedstheacceptanceofyour productsfordistributionandsale.wellctestedappsthatperformasexpectedimproveuser satisfaction.testingcanalsohelpyoudevelopyourappsfasterandfurther,withlesswasted effort,andcanbeusedtohelpmulticpersondevelopmenteffortsstaycoordinated. NSUserDefaults-allowsyoutoeasilyreadandsavedatafromanywhereinyourapp. Details CreateasingleviewiPhoneapplicationusingObjectiveCCasprogramminglanguage.Nameyour project Exercise3GroupX (replacexwithyourstationnumber). Autolayoutisforextracredit(optional).Therefore,whenyousubmit,mentionwhichsimulator (4S,5,5S,6,6+,orall)yourappisdesignedtoworkwith. CreateacategoryonNSString.(FileC>NewC>ObjectiveCcfileC>FileType=Category,Class= NSString). Implementmethodstocheckifastring. containsuppercasecharacter containsanumber containspunctuation isavalid [SeeProgrammingTip1]. Write2testcasesforeachmethodinthecategorywejustcreated.[SeeProgrammingTip2]. CreateaUserobjectwithtwoattributes: ,andpassword.MakesurethattheUserObject implementsthenscodingprotocolbecausewehavetostorethiscustomobjectin NSUserdefaults).[SeeProgrammingTip3].

2 Youwillhavetwoviewcontrollers loginandhome[figure1]. Designyourinterfacetolooklike(orbetterthan)thescreenshotsbelowwithfollowinglogic. Usethecategorymethodstoensure stringisvalidandchosenpasswordisstrong. Whentheuserenters andpasswordattheloginscreenandtapsonthe login button: o RetrievearrayofuserobjectsfromNSUserDefaults.[SeeProgrammingTip4]. o Iftheuserexistsinthearraywithgivencredentials loginif /passwordcombinationmatches.otherwise,displayalabel withappropriateerrormessage. o Ifuserdoesnotexistwithgivencredentials addtheusertoarrayofuserobjects,savethenewarrayin NSUserDefaultsandlogin. Whentheusertapsthelogoutbuttonfromthehomescreen,s/heisredirectbackto theloginscreen. Grading Successfulcreationandimplementationofcategory[+2] Implementedallunittests.Alltestsshouldrunsuccessfully[+2] NSUserDefaults:savingandretrievingworkingasexpected[+2] Correctimplementationofapplogicanderrorhandling[+2] GoodUIdesign(propercolorcontrasts,correctgrammar,propersizingofUIelements,etc). [+2] ExtraCredit YourinterfaceshouldscaleproperlyforalliPhonesimulatorsizes(iPhone4S,5,6,6+). [+2] DisplayerrormessagesusingUIAlertController.[+1] Addexceptiontests.[+2] Indicatepasswordstrengthwhiletheuseristypingthepassword.Use UITextfieldDelegatemethodstoachievethis[+3] Submission ZipXcodeprojectandsubmittoblackboard.Nameyourproject Exercise3GroupX (replace Xwithyourgroupnumber). * *

3 Screenshots Figure1 ProgrammingTip1 Codefortwocategorymethods -(BOOL) haspunctuation { NSRange range = [self rangeofcharacterfromset:[nscharacterset punctuationcharacterset]]; return range.location = NSNotFound; - (BOOL)isValid { NSString *expression NSError *error = NULL; NSRegularExpression *regex = [NSRegularExpression regularexpressionwithpattern:expression options:nsregularexpressioncaseinsensitive error:&error]; NSTextCheckingResult *match = [regex firstmatchinstring:self options:0 range:nsmakerange(0, [self length])]; if (match) { return true; else return false;

4 // implement the other methods mentioned above ProgrammingTip2 UnittestsintheExercise3GroupXTests.mfile // import the required header files and then write the test -(void)teststringhasanuppercaseletter { NSString* teststring XCTAssertTrue([testString String did not have an upper case character"); ProgrammingTip3 ImplementingtheNSCodingprotocol -(id)initwithcoder:(nscoder *)adecoder { if ( self = [super init] ) { self. = [adecoder decodeobjectforkey:@" "]; // code for other attribute(s) return self; // give a key for each object you store -(void) encodewithcoder:(nscoder *)acoder { [acoder encodeobject: forkey:@" "]; // code for other attribute(s) ProgrammingTip4 RetreiveandsavedatafromNSUserDefaults - (NSArray*) retrievedatafromnsuserdefaults { NSMutableArray *objectarray = [NSMutableArray new]; NSUserDefaults *currentdefaults = [NSUserDefaults standarduserdefaults]; NSData *datarepresentingsavedarray = [currentdefaults objectforkey:@"savedarray"]; if (datarepresentingsavedarray = nil) { NSArray *oldsavedarray = [NSKeyedUnarchiver unarchiveobjectwithdata:datarepresentingsavedarray];

5 if (oldsavedarray = nil) objectarray = [[NSMutableArray alloc] initwitharray:oldsavedarray]; else objectarray = [[NSMutableArray alloc] init]; return objectarray; - (void)storedatainnsuserdefaults:(user *)usertostore { NSMutableArray *objectarray = [NSMutableArray arraywitharray:[self retrievedatafromnsuserdefaults]]; [objectarray addobject:usertostore]; [[NSUserDefaults standarduserdefaults] setobject:[nskeyedarchiver archiveddatawithrootobject:objectarray] forkey:@"savedarray"];