- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    NSString* cityPlistPath = [[NSBundle mainBundle] pathForResource:@"cities" ofType:@"plist"];

    //按照拼写排序,spell是英文拼写

    NSSortDescriptor *bySpell  = [NSSortDescriptor sortDescriptorWithKey:@"spell" ascending:YES];

    NSArray *cities = [[NSArray arrayWithContentsOfFile:cityPlistPath] sortedArrayUsingDescriptors:@[bySpell]];

    NSLog(@"--cities--%@",cities);

}