/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The annotation to represent a region that is being monitored.

 */

#import "RegionAnnotation.h"

@interface RegionAnnotation()

@property (nonatomic, copy) NSString *subtitle;

@end

@implementation RegionAnnotation

// Initialize the annotation object.

- (instancetype)init {

    self = [super init];

    if (self != nil) {

        _title = @"Monitored Region";

    }

    return self;    

}

// Initialize the annotation object with the monitored region.

- (instancetype)initWithCLRegion:(CLCircularRegion *)newRegion {

    self = [self init];

    if (self != nil) {

        _region = newRegion;

        _coordinate = newRegion.center;

        _radius = newRegion.radius;

        _title = @"Monitored Region";

    }       

    return self;        

}

/*

 This method provides a custom setter so that the model is notified when the subtitle value has changed, which is derived from the radius.

 */

- (void)setRadius:(CLLocationDistance)newRadius {

    [self willChangeValueForKey:@"subtitle"];

    _radius = newRadius;

    [self didChangeValueForKey:@"subtitle"];

}

- (NSString *)subtitle {

    return [NSString stringWithFormat: @"Lat: %.4F, Lon: %.4F, Rad: %.1fm", self.coordinate.latitude, self.coordinate.longitude, self.radius];

}

@end