简单的大头针地图标示练习（无xib）

用4.2创建的空模班，添加的UIViewController类，取名为mapView.(按正规命名方式应该为MapView，大家见谅)。

以下为添加的代码

mapView.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import <QuartzCore/QuartzCore.h>

@interface mapView : UIViewController <CLLocationManagerDelegate>
{
    CLLocationManager *locManager;
    MKMapView *map;
    CLLocation *bestLocation;
}
@property (retain) CLLocationManager *locManager;
@property (retain) CLLocation *bestLocation;
@end

 mapView.m

//
//  mapView.m
//  Map
//
//  Created by SuperHappy on 12-1-31.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "mapView.h"
#define BARBUTTON(TITLE, SELECTOR)     [[[UIBarButtonItem alloc] initWithTitle:TITLE style:UIBarButtonItemStylePlain target:self action:SELECTOR] autorelease]
@implementation mapView
@synthesize locManager;
@synthesize bestLocation;

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"Location manager error :%@",[error description]);
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    if (!self.bestLocation) {
        self.bestLocation = newLocation;
    }
    else if(newLocation.horizontalAccuracy < bestLocation.horizontalAccuracy)
        self.bestLocation = newLocation;
    map.region = MKCoordinateRegionMake(self.bestLocation.coordinate, MKCoordinateSpanMake(0.1f, 0.1f));
    map.showsUserLocation = YES;
    map.zoomEnabled = NO;

}
- (void)findme
{
    // disable right button
    self.navigationItem.rightBarButtonItem = nil;
    
    // Search for the best location
    self.bestLocation = nil;
    self.locManager.delegate = self;
    [self.locManager startUpdatingLocation];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle


// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
    [super loadView];
    map = [[MKMapView alloc]initWithFrame:CGRectMake(10, 10, 300, 300)];
    [self.view addSubview:map];
    [map release];
    
    self.navigationController.navigationBar.tintColor = [UIColor redColor];
    
    self.locManager = [[[CLLocationManager alloc] init] autorelease];
    if (!self.locManager.locationServicesEnabled)
    {
        NSLog(@"User has opted out of location services");
        return;
    }
    else 
    {
        // User generally allows location calls
        self.locManager.desiredAccuracy = kCLLocationAccuracyBest;
        self.navigationItem.rightBarButtonItem = BARBUTTON(@"Find Me", @selector(findme));
    }

}


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

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end