Ios 未定义的声明错误

我正在尝试开发一个iPhone应用程序，它给出当前的纬度和经度值，但出现了一个名为“Undefined declaration”的错误。你能帮我整理一下吗。提前谢谢

#import "LoginViewController.h"
//#import <CoreLocation/CoreLocation.h>

@interface LoginViewController ()

@end

@implementation LoginViewController
@synthesize locationManager;
- (void)dealloc
{
   // [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)Button:(id)sender
{
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    [locationManager startUpdatingLocation];
    CLLocation *location = [locationManager location];
    CLLocationCoordinate2D coordinate = [location coordinate];
    NSString *latitude = [NSString stringWithFormat:@"%f", coordinate.latitude];
    NSString *longitude = [NSString stringWithFormat:@"%f", coordinate.longitude];
    NSLog(@"dLatitude : %@", latitude);
    NSLog(@"dLongitude : %@", longitude);
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 40, 250, 50)];
    UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 80, 200, 50)];
    UILabel *myLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(50, 120, 200, 100)];
    myLabel.textColor = [UIColor blackColor];
    myLabel1.textColor = [UIColor blackColor];

    label.backgroundColor = [UIColor clearColor];
    myLabel.backgroundColor = [UIColor clearColor];
    myLabel1.backgroundColor = [UIColor clearColor];
    [myLabel setText:latitude];
    [myLabel1 setText:longitude];
    label.text = @"Current Latitude and Longitude";
    [self.view addSubview:label];
    [self.view addSubview:myLabel];
    [self.view addSubview:myLabel1];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait); <---GETTING ERROR HERE

}

@end

#导入“LoginViewController.h”
//#进口
@接口LoginViewController（）
@结束
@实现LoginViewController
@综合定位经理；
-（无效）解除锁定
{
//[super dealoc]；
}
-（无效）未收到记忆警告
{
[超级记忆警告]；
//处置所有可以重新创建的资源。
}
-（无效）视图卸载
{
[超级视频下载]；
//加载视图后，通常从nib执行任何其他设置。
}
-（iAction）按钮：（id）发送者
{
locationManager=[[CLLocationManager alloc]init]；
locationManager.delegate=self；
locationManager.desiredAccuracy=KCallocationAccuracyHundredMeters；
locationManager.distanceFilter=KCLDistanceFilterOne；
[locationManager startUpdatingLocation]；
CLLocation*location=[locationManager位置]；
CLLocationCoordinate2D坐标=[位置坐标]；
NSString*纬度=[NSString stringWithFormat:@“%f”，坐标.纬度]；
NSString*经度=[NSString stringWithFormat:@“%f”，坐标.经度]；
NSLog（@“纬度：%@”，纬度）；
NSLog（@“长度：%@”，经度）；
UILabel*label=[[UILabel alloc]initWithFrame:CGRectMake（50,40,250,50）]；
UILabel*myLabel=[[UILabel alloc]initWithFrame:CGRectMake（50,80,200,50）]；
UILabel*myLabel1=[[UILabel alloc]initWithFrame:CGRectMake（50120200100）]；
myLabel.textColor=[UIColor blackColor]；
myLabel1.textColor=[UIColor blackColor]；
label.backgroundColor=[UIColor clearColor]；
myLabel.backgroundColor=[UIColor clearColor]；
myLabel1.backgroundColor=[UIColor clearColor]；
[myLabel setText:纬度]；
[myLabel1 setText:经度]；
label.text=@“当前纬度和经度”；
[self.view addSubview:label]；
[self.view addSubview:myLabel]；
[self.view addSubview:myLabel1]；
}
-（布尔）应将自动旋转指针面方向：（UIInterfaceOrientation）转换为接口方向
{
return（interfaceOrientation==UIInterfaceOrientationPortrait）；应该是

return (toInterfaceOrientation == UIInterfaceOrientationPortrait); 

你知道是哪一行产生了这个错误吗？这是最后一个返回语句，上面写着未声明的标识符“interfaceOrientation”