about sharedInstance SOMotionDetector and SOStepDetector objective-c - ios

Question

I'm working on the following code, which has the steps of a person walking. but every time I step from one view to another the counter stops. I am working with SOMotionDetector.
NOTE: when printing to console the steps that continues to function even changing views.
#import "SOMotionDetector.h"
#import "SOStepDetector.h"
#interface ContarPasos ()<SOMotionDetectorDelegate>
{
int stepCount;
}
#property (weak, nonatomic) IBOutlet UILabel *speedLabel;
#property (weak, nonatomic) IBOutlet UILabel *stepCountLabel;
#property (weak, nonatomic) IBOutlet UILabel *motionTypeLabel;
#property (weak, nonatomic) IBOutlet UILabel *isShakingLabel;
#end
#implementation ContarPasos
- (void)viewDidLoad
{
[super viewDidLoad];
__strong ContarPasos *weakSelf = self;
[SOMotionDetector sharedInstance].motionTypeChangedBlock = ^(SOMotionType motionType) {
NSString *type = #"";
switch (motionType) {
case MotionTypeNotMoving:
type = #"No estas moviendote";
break;
case MotionTypeWalking:
type = #"Caminando";
break;
case MotionTypeRunning:
type = #"Corriendo";
break;
case MotionTypeAutomotive:
type = #"Automotive";
break;
}
weakSelf.motionTypeLabel.text = type;
};
[SOMotionDetector sharedInstance].locationChangedBlock = ^(CLLocation *location) {
weakSelf.speedLabel.text = [NSString stringWithFormat:#"%.2f km/h", [SOMotionDetector sharedInstance].currentSpeed * 3.6f];
};
[SOMotionDetector sharedInstance].accelerationChangedBlock = ^(CMAcceleration acceleration) {
BOOL isShaking = [SOMotionDetector sharedInstance].isShaking;
weakSelf.isShakingLabel.text = isShaking ? #"Corriendo":#"No corriendo";
};
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"7.0")) {
[SOMotionDetector sharedInstance].useM7IfAvailable = YES; //Use M7 chip if available, otherwise use lib's algorithm
}
[[SOMotionDetector sharedInstance] startDetection];
[[SOStepDetector sharedInstance] startDetectionWithUpdateBlock:^(NSError *error) {
if (error) {
NSLog(#"%#", error.localizedDescription);
return;
}
stepCount++;
weakSelf.stepCountLabel.text = [NSString stringWithFormat:#"Pasos: %d", stepCount];
NSLog(#"always printed on console but not in the view: %d", stepCount);
}];
}