1天学习1个类库 MKMapView Overlay示例

示例代码:

main.m

////  main.m//  ControlDemo////  Created by watsy0007 on 12-6-3.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>#import <MapKit/MapKit.h>#import <CoreLocation/CoreLocation.h>#define MAPVIEW_SEGMENTCONTROL_TAG_TYPE             1#define MAPVIEW_SEGMENTCONTROL_TAG_USERTRACK        2@interface ViewController : UIViewController <MKMapViewDelegate> {    MKMapView   *_mapView_;}@end@implementation ViewController- (void) dealloc {    [_mapView_ release];        [super dealloc];}//随机生成覆盖位置- (NSArray *) randomOverlay:(NSInteger) nMax {    NSMutableArray *overlayArray = [NSMutableArray arrayWithCapacity:nMax];    for (int i = 0; i < nMax; i++) {        double dRandlatitude = (double)(rand() % 10000) / 1000000;        double dRandlongitude  = (double)(rand() % 10000) / 1000000;        BOOL bAdd = rand() % 2;        if (bAdd) {            dRandlatitude = -dRandlatitude;        }         bAdd = rand() % 2;        if (bAdd) {            dRandlongitude = -dRandlongitude;        }                 MKCircle *mCircle = [MKCircle circleWithCenterCoordinate:CLLocationCoordinate2DMake(22.551368 +  dRandlatitude, 113.882654 + dRandlongitude)                                                           radius:100.0];        [overlayArray addObject:mCircle];            }         return overlayArray;}- (void) loadView {    [super loadView];        self.view.backgroundColor = [UIColor whiteColor];    self.title = @"MapKit Demo";        _mapView_ = [[MKMapView alloc] initWithFrame:self.view.bounds];    _mapView_.delegate = self;    //显示用户坐标    _mapView_.showsUserLocation = YES;        //设置地区    MKCoordinateRegion currentRegion = MKCoordinateRegionMakeWithDistance(CLLocationCoordinate2DMake(22.551368,113.882654), 0.0002, 0.0002);    //    _mapView_.region = currentRegion;    [_mapView_ setRegion:currentRegion animated:YES];    MKCoordinateRegion fitRegin = [_mapView_ regionThatFits:currentRegion];    [_mapView_ setRegion:fitRegin animated:YES];        [_mapView_ addOverlays:[self randomOverlay:10]];        [self.view addSubview:_mapView_];   }- (void) viewWillUnload {        [_mapView_ release];    [super viewWillUnload];}- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {    return YES;}- (void) viewDidLoad {    [super viewDidLoad];}#pragma mark -#pragma mark MKMapViewDelegate delegate//完成更新用户坐标- (void) mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {    MKMapPoint pUser = MKMapPointForCoordinate(userLocation.coordinate);        //动态计算要现实的矩形    NSArray *array = [mapView overlays];    MKMapRect visiableRect = [mapView visibleMapRect];        if (pUser.x < visiableRect.origin.x) {        visiableRect.origin.x = pUser.x;        visiableRect.size.width += (visiableRect.origin.x - pUser.x);    }        for (int i = 0; i < [array count]; i++) {        MKCircle *circleOverlay = [array objectAtIndex:i];        MKMapPoint play = MKMapPointForCoordinate(circleOverlay.coordinate);        if (play.x < visiableRect.origin.x) {            visiableRect.origin.x = play.x;            visiableRect.size.width += (visiableRect.origin.x - play.x);        } else if (play.x > (visiableRect.origin.x + visiableRect.size.width) ) {            visiableRect.size.width = visiableRect.size.width + (play.x - (visiableRect.origin.x + visiableRect.size.width));        }                if (play.y < visiableRect.origin.y) {            visiableRect.origin.y = play.y;            visiableRect.size.height = visiableRect.size.height + (visiableRect.origin.y - play.y);        } else if (play.y > (visiableRect.origin.y + visiableRect.size.height)) {            visiableRect.size.height = visiableRect.size.height + (play.y - (visiableRect.origin.y + visiableRect.size.height));        }    }        [mapView setVisibleMapRect:visiableRect animated:YES];    }- (MKOverlayView *) mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay {        //返回覆盖的视图    MKCircleView *circleView = (MKCircleView *)[mapView viewForOverlay:overlay];    if (circleView == nil) {        circleView = [[[MKCircleView alloc] initWithOverlay:overlay] autorelease];        circleView.strokeColor = [UIColor redColor];        circleView.lineWidth = 2.0;        circleView.fillColor = [UIColor colorWithRed:202.0 / 255.0                                                green:202.0 / 255.0                                                 blue:202.0 / 255.0                                                alpha:1.0];            }    return circleView;}@end//-----------------------------------------------------------------------------------------------------#pragma mark -#pragma mark AppDelegate@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UIViewController *viewController;@end@implementation AppDelegate@synthesize window = _window;@synthesize viewController = _viewController;- (void) dealloc {    [_window release];    [_viewController release];        [super dealloc];}- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    srand(time(NULL));        self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];        self.viewController = [[ViewController alloc] init];        UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:self.viewController];     self.window.rootViewController = controller;    [controller release];        [self.window makeKeyAndVisible];    return YES;}@endint main(int argc, char *argv[]){    @autoreleasepool {        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));    }}