- (NSDictionary *)graphFromFile {
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"route" ofType:@"plist"];
    NSDictionary *graphFromFile = [[NSDictionary alloc] initWithContentsOfFile:filePath];
    return graphFromFile;
}

- (NSDictionary *)graphFromCode {
    return @{@"A":@{@"B":@(4),@"C":@(0.9)},
             @"B":@{@"E":@(4)},
             @"C":@{@"B":@(2),@"D":@(4)},
             @"D":@{@"E":@(4)}
             };
} 

JLDijkstra.h
JLDijkstra.m

#import "JLDijkstra.h"

NSDictionary *graph = [self graphFromFile];
OR
NSDictionary *graph = [self graphFromCode];

JLDijkstra *dijkstra = [[JLDijkstra alloc] init];
JLDijkstraResult *result = [dijkstra getRouteFromGraph:graph
                                           startVertex:@"A"
                                             endVertex:@"E"];

if(result) {
    NSLog(@"route : %@", result.route);
    NSLog(@"distance : %.1f", result.distance);
}
else {
    NSLog(@"no result");
}

route : (
    A,
    C,
    B,
    E
)
distance : 6.9