在 iPhone 的應用程式中,有許多熱門是使用 Google Map 的服務,透過 mobile device 的行動性,使得科技服務與生活有更密切的結合。在此使用 iPhone SDK 3.0 的 Mapkit framework 實作。

相關資料如下:

建立一個新的 Project ,[Xcode]->[Create a New Xcode Project]->[iPhone OS]->[Application]->[Window-based Application] 取名為 MyMap 。並且對左邊介面上之目錄列表裡的 Framework ,按他一下並點選右鍵來加入 MapKit Framework

[Framework] -> [Add] -> [Existing Frameworks] ->[MapKit.framework]

MyMapAppDelegate.h

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

@interface MyMapAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    MKMapView *myMap;    
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

MyMapAppDelegate.m

#import "MyMapAppDelegate.h"

@implementation MyMapAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(UIApplication *)application {
    CGRect full = CGRectMake(0, 0, 320, 460);
    myMap = [[MKMapView alloc] initWithFrame:full];
    [window addSubview:myMap];
    // Override point for customization after application launch
    [window makeKeyAndVisible];
}

- (void)dealloc {
    [myMap release];
    [window release];
    [super dealloc];
}

@end

成果

GMap

以上是一個精簡的範例,但並不實用,而程式碼的重複使用也不佳,更好的使用方式是在為這個範例增加一個 ViewController:

[Xcode]->[File]->[New File]->[Cocoa Touch Class]->[UIViewController subclass] ,在此稱作 GoogleMapView 好了!別忘了勾選 With XIB for user interface

同時修改原先的程式碼:

MyMapAppDelegate.h

#import <UIKit/UIKit.h>
#import "GoogleMapView.h"

@interface MyMapAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    GoogleMapView *gMap;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

MyMapAppDelegate.m

#import "MyMapAppDelegate.h"

@implementation MyMapAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(UIApplication *)application {
    gMap = [[GoogleMapView alloc] init];
    [window addSubview:gMap.view];
    // Override point for customization after application launch
    [window makeKeyAndVisible];
}

- (void)dealloc {
    [gMap release];
    [window release];
    [super dealloc];
}

@end

新增的程式碼:

GoogleMapView.h

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

@interface GoogleMapView : UIViewController {
    IBOutlet MKMapView *myMap;
}

@end

GoogleMapView.m

#import "GoogleMapView.h"

@implementation GoogleMapView

/*
 // The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}
*/

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    myMap = [[MKMapView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:myMap];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return YES;
}

- (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.
}

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

- (void)dealloc {
    [myMap release];
    [super dealloc];
}

@end

點擊 GoogleMapView.xib

接下來要設置當 iPhone 轉 90 度依舊能夠填滿整個螢幕,這部份要在 Interface Builder 調整,在 Library 頁面上,找尋 MKMapView 物件並拖拉到 View 的上(可以透過 Library  下方的搜尋),接著也別忘了要按 ctrl 並點選 File's owner 去跟 MKMapView 物件建立 myMap 連線,最後在 Map View Size 那邊可以去調整 Autosizing,把框框四處都點起來,讓他充滿。

MapViewSize

如果不設定的話,那到時候的結果會是這樣:

GMap2

成果:

GMap3

以上只是簡單的呈現 Google Map ,而弄成一個 UIViewController,是方便以後替它增加一些功能以及提供程式的重複使用性,剩下的有空在補上。


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