一個google map的範例(1)

//
//  UIgmapDemoViewController.h
//  UIgmapDemo
//
//  Created by Administrator on 13/3/6.
//  Copyright (c) 2013年 Administrator. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface UIgmapDemoViewController : UIViewController

{
	//MKMapView *mapView;
}
@property (weak,nonatomic) IBOutlet MKMapView *mapView;
@end

//
//  UIgmapDemoViewController.m
//  UIgmapDemo
//
//  Created by Administrator on 13/3/6.
//  Copyright (c) 2013年 Administrator. All rights reserved.
//

#import "UIgmapDemoViewController.h"
#define METERS_PER_MILE 1609.344

@interface UIgmapDemoViewController ()

@end

@implementation UIgmapDemoViewController

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

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (void)viewWillAppear:(BOOL)animated
{
	// 1
    CLLocationCoordinate2D zoomLocation;
    zoomLocation.latitude = 39.281516;
    zoomLocation.longitude= -76.580806;
	
    // 2
    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE);
	
    // 3
    [_mapView setRegion:viewRegion animated:YES];
}
@end