How to know the closest iBeacon

Question

I have a code to know which beacon is the closest, but I have a problem when a beacon\'s accuracy is -1.00000, the the app takes the second one.

So there is a bucle

Answer 1

First of all: Replace your long else/if of locationManager:didRangeBeacons:inRegion: with:

if (([closestBeacon.minor intValue] > 0 && [closestBeacon.minor intValue] <= 11) || [closestBeacon.minor intValue] == 30)
{
    actualSection = [closestBeacon.minor intValue]; 
    [self immediateDetection];
}

Replace your long else/if in immediateDetection with:

if ((actualSection > 0 && actualSection < 10 || actualSection == 30)
{
    SectionViewController *sectionView = [[SectionViewController alloc] init];
    sectionView.section = actualSection;
    [self presentViewController:sectionView animated:NO completion:nil];
    sectionView.lbl_name.text = self.lbl_name.text;
}
else if (actualSection == 10 || actualSection == 11)
{
    ThiefAlarmViewController *thiefAlarmView = [[ThiefAlarmViewController alloc] init];
    [self presentViewController:thiefAlarmView animated:NO completion:nil];
}
else
{
}

That should save you a lot of code.

For your issue, you could to this:

    NSPredicate *predicateIrrelevantBeacons = [NSPredicate predicateWithFormat:@"(self.accuracy != -1) AND ((self.proximity != %d) OR (self.proximity != %d))", CLProximityFar,CLProximityUnknown];
NSArray *relevantsBeacons = [beacons filteredArrayUsingPredicate: predicateIrrelevantBeacons];
    NSPredicate *predicateMin = [NSPredicate predicateWithFormat:@"self.accuracy == %@.@min.accuracy", relevantsBeacons];

    CLBeacon *closestBeacon = nil;
    NSArray *closestArray = [[relevantsBeacons filteredArrayUsingPredicate:predicateMin];
    if ([closestArray count] > 0)
        closestBeacon = [closestArray objectAtIndex:0];
   if (closestBeacon)
   { //Do your thing }
   else
   {//No relevant close beacon}