iOS 6蘋果地圖應用（MapKit）－內建開發

原始地址：iOS 6蘋果地圖應用（MapKit）－內建開發

本文是蘋果案例RegionDefiner的注釋。

#import "ViewController.h"#import "MyAnnotation.h"@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    self.mainMapView = [[MKMapView alloc] init];        self.mainMapView.delegate = self;    [self.mainMapView setUserInteractionEnabled: YES];    [self.mainMapView setScrollEnabled: YES];        UIToolbar *toolbar = [[UIToolbar alloc] init];    toolbar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;    [toolbar sizeToFit];        CGSize containerSize = self.view.bounds.size;    CGSize toolbarSize = toolbar.bounds.size;        UIBarButtonItem *resetButton = [[UIBarButtonItem alloc] initWithTitle:@"Reset"                                                                          style: UIBarButtonItemStyleBordered                                                                         target: self                                                                         action: @selector(removePins)];    UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];        UIBarButtonItem *share = [[UIBarButtonItem alloc] initWithTitle: @"Log"                                                                  style: UIBarButtonItemStyleBordered                                                                 target: self                                                                 action: @selector(tappedShare)];    toolbar.frame = CGRectMake(0, containerSize.height - toolbarSize.height, containerSize.width, toolbarSize.height);    self.mainMapView.frame = CGRectMake(0, 0, containerSize.width, containerSize.height - toolbarSize.height);    [self.view addSubview:self.mainMapView];    [self.view addSubview:toolbar];        //工具條上添加"重設按鈕","空白","日誌按鈕"    [toolbar setItems:@[ resetButton, flexibleSpace, share ]];        [self setUpGesture];            self.itemsArray = [[NSMutableArray alloc] init];}- (void)viewDidUnload{    [self setMainMapView:nil];    [super viewDidUnload];}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)    {        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);    } else {        return YES;    }}#pragma mark -#pragma mark Dropping pins//添加長按手勢- (void)setUpGesture{    self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget: self                                                                   action: @selector(handleLongPress:)];    self.longPress.delegate = self;    [self.view addGestureRecognizer:self.longPress];}//處理長按手勢- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer{    if (recognizer.state == UIGestureRecognizerStateBegan)    {        CGPoint longPressPoint = [recognizer locationInView:self.view];        //在此點繪製圖釘        [self dropPinAtPoint:longPressPoint];    }}- (void)updatePolygon{    CLLocationCoordinate2D *points = malloc(sizeof(CLLocationCoordinate2D) * self.itemsArray.count);    NSUInteger i = 0;    for (MyAnnotation *pin in self.itemsArray)    {        //添加所有座標的經緯度        points[i] = pin.coordinate;        i++;    }        //清除地圖上上次繪製的圖形    [self.mainMapView removeOverlay:self.polygon];        //繪製多邊形    self.polygon = [MKPolygon polygonWithCoordinates:points count:self.itemsArray.count];    [self.mainMapView addOverlay:self.polygon];}- (void) dropPinAtPoint: (CGPoint) pointToConvert{    //把視圖上的點轉換成經緯度    CLLocationCoordinate2D convertedPoint = [self.mainMapView convertPoint: pointToConvert toCoordinateFromView: self.view];        //圖釘的標題    NSString *pinTitle = [NSString stringWithFormat: @"Pin number %i", self.itemsArray.count];        //圖釘的子標題，顯示經緯度    NSString *subCoordinates = [NSString stringWithFormat: @"%f, %f", convertedPoint.latitude, convertedPoint.longitude];        MyAnnotation *droppedPin = [[MyAnnotation alloc] initWithCoordinate: convertedPoint title: pinTitle subtitle: subCoordinates];        //在地圖上添加這個標記    [self.mainMapView addAnnotation:droppedPin];    //加入數組    [self.itemsArray addObject:droppedPin];    //更新多邊形    [self updatePolygon];}- (void)removePins{    //移除標記    [self.mainMapView removeAnnotations:self.mainMapView.annotations];    //重設    [self.itemsArray removeAllObjects];    //清除繪製的多邊形    [self.mainMapView removeOverlay:self.polygon];    //更新多邊形    [self updatePolygon];}#pragma mark - Output//動作記錄- (void)tappedShare{    NSLog(@"%@", [self coordinates]);}- (NSString *)coordinates{    //繪製多邊形至少需要三個點    if (self.itemsArray.count < 3)    {        return @"Minimum of 3 vertices requried to make polygon.";    }        NSString *masterString = @"\n{ \"type\": \"MultiPolygon\",\n \"coordinates\": [\n[[";    for (MyAnnotation *pin in self.itemsArray)    {        masterString = [masterString stringByAppendingFormat: @"[%f, %f],\n", pin.coordinate.longitude, pin.coordinate.latitude];    }        // GeoJSON requires that the first and last vertices be identical    MyAnnotation *firstPin = [self.itemsArray objectAtIndex:0];    masterString = [masterString stringByAppendingFormat: @"[%f, %f],\n", firstPin.coordinate.longitude, firstPin.coordinate.latitude];        masterString = [masterString stringByAppendingString: @"]]\n]\n}\n"];    masterString = [masterString stringByReplacingOccurrencesOfString: @"],\n]]" withString: @"]]]"];       return masterString;}#pragma mark - MKMapViewDelegate- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay{    if (self.polygonView && self.polygonView.polygon == self.polygon)        return self.polygonView;        self.polygonView = [[MKPolygonView alloc] initWithPolygon:self.polygon];    //填充色    self.polygonView.fillColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:0.3f];    //邊界顏色    self.polygonView.strokeColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:0.9f];    //邊線寬度    self.polygonView.lineWidth = 1.0f;    return self.polygonView;}@end