ios - Comparing speed values issue(what ever i am getting from CLLocationManager) -

i having little bit confused regarding way of asking question

any how mentioning query support of image here. can please me out regarding issue

step 1: have requirement like: using cllocationmanger delegate methods fetched speed value like:

- (void)startlocationupdates{ locationmanager = [[cllocationmanager alloc] init]; locationmanager.delegate = self; locationmanager.distancefilter = kcldistancefilternone; locationmanager.desiredaccuracy = kcllocationaccuracybest; locationmanager.pauseslocationupdatesautomatically = yes; if ([[[uidevice currentdevice] systemversion] floatvalue] >= 8.0)     [locationmanager requestwheninuseauthorization]; [locationmanager startupdatinglocation]; } #pragma mark #pragma mark - cllocationmanagerdelegate  - (void)locationmanager:(cllocationmanager *)manager  didupdatelocations:(nsarray *)locations{ float speed = locationmanager.location.speed; float speedinkmph = speed * 3.6;   // convert speed kmph. nsstring *speedvalue =[nsstring stringwithformat:@"%.f kmph ",speedinkmph]; self.currentspeedlblref.text = speedvalue; self.maxspeedlblref.text = speedvalue; } 

step 2: currentspeedlblref,maxspeedlblref --> these uilabels

example: driving car --> first time opened app , got current speed of car(like: 120 kmph) , need display same value in "maxspeedlblref"(120 kmph) also

after time current speed of car if 50 kmph. need display value in "maxspeedlblref" --> max value --> means 120 kmph . because getting 120 kmph value previos

after if current speed of car if 180 kmph --> need show "maxspeedlblref" valu like: 180 kmph. because latest 1 compare 120 kmph

after close app ,

if reopen app want show vale "maxspeedlblref" --> 180 kmph. because value previous saved value

here source code:click here link

you missing few simple things here!

you need store max speed comparison - you're doing here is updating label current value every time. set class-level attribute, initial value = 0, , update whenever current speed > max speed.

there few ways can store max value it's there when next open app. easiest go user defaults. there many tutorials available - try 1 http://code.tutsplus.com/tutorials/ios-sdk-working-with-nsuserdefaults--mobile-6039

ok - using project code, here's need.

update viewcontroller.h this

//  viewcontroller.h  #import <uikit/uikit.h>  @interface viewcontroller : uiviewcontroller @property (weak, nonatomic) iboutlet uilabel *currentspeedlblref; @property (weak, nonatomic) iboutlet uilabel *maxspeedlblref;  // need store max speed @property float speedmax;  -(void)loaddefaults; -(void)storedefaults;  @end 

and in viewcontroller.m, replace viewdidload this

- (void)viewdidload {     [super viewdidload];     // additional setup after loading view, typically nib.      [self loaddefaults];      [self startlocationupdates]; } 

update locationmanager function this

- (void)locationmanager:(cllocationmanager *)manager  didupdatelocations:(nsarray *)locations{     float speed = locationmanager.location.speed;     float speedinkmph = speed * 3.6;   // convert speed kmph.     nsstring *speedvalue =[nsstring stringwithformat:@"%.f kmph ",speedinkmph];     self.currentspeedlblref.text = speedvalue;      if (speedinkmph > self.speedmax)     {         self.speedmax = speedinkmph;          [self storedefaults];     }     nsstring *speedmaxvalue =[nsstring stringwithformat:@"%.f kmph ",self.speedmax];      self.maxspeedlblref.text = speedmaxvalue; } 

and, add load / store functions

- (void)loaddefaults {     nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults];     self.speedmax = [defaults floatforkey:@"speedmax"]; }  - (void)storedefaults {     nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults];     [defaults setfloat:self.speedmax forkey:@"speedmax"];     [defaults synchronize]; }