苹果地图2，定位，标注，返回中心。

//

//  ViewController.m

//  mapdemo001

//

//  Created by apple on 14-4-28.

//  Copyright (c) 2014年 apple. All rights reserved.

//

#import "ViewController.h"

#import <MapKit/MapKit.h>

#import "MyAnnotation.h"
@interface ViewController () <MKMapViewDelegate>

{

    MKMapView *_mapview;

    UIButton *_backBtn;

}

@end
@implementation ViewController
- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.
MKMapView *mapview = [[MKMapView alloc] initWithFrame:self.view.bounds];

    mapview.delegate = self;

    mapview.showsUserLocation = YES;

    [self.view addSubview:mapview];
_backBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [_backBtn setTitle:@"返回中心位置" forState:UIControlStateNormal];

    _backBtn.frame = CGRectMake(30, 50, 100, 30);

    [_backBtn addTarget:self action:@selector(myselect) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_backBtn];

}
- (void)myselect

{

    // 设置中心位置

    [_mapview setCenterCoordinate:_mapview.userLocation.location.coordinate];

    // 设置跨度

    MKCoordinateSpan span = MKCoordinateSpanMake(0.812988, 0.888449);

    // 显示区域

    MKCoordinateRegion region = MKCoordinateRegionMake(_mapview.userLocation.location.coordinate, span);
// 设置显示区域

    [_mapview setRegion:region animated:YES];

}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation

{

    if (_mapview) {

        return;

    }

    // 设置中心位置

    [mapView setCenterCoordinate:userLocation.location.coordinate];

    // 设置跨度

    MKCoordinateSpan span = MKCoordinateSpanMake(0.812988, 0.888449);

    // 显示区域

    MKCoordinateRegion region = MKCoordinateRegionMake(userLocation.location.coordinate, span);
// 设置显示区域

    [mapView setRegion:region animated:YES];

    _mapview = mapView;

}
- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated

{

    // 当前的中心位置

    //CLLocationCoordinate2D coord = mapView.region.center;

    // 在这个代理方法里找到车或者人，让后添加标注。添加标注以后，会在viewforannotation方法里把标注显示出来

    //mapView addAnnotation:<#(id<MKAnnotation>)#>
for (int i=0; i<10; i++) {

        MyAnnotation *anno = [[MyAnnotation alloc] init];

        anno.coordinate = CLLocationCoordinate2DMake(39+arc4random()%100/100.0, 116+arc4random()%100/100.0);

        //

        NSString *str = [NSString stringWithFormat:@"%d",i];

        anno.title = str;

        [mapView addAnnotation:anno];

    }
NSLog(@"%f %f",mapView.region.span.latitudeDelta,mapView.region.span.longitudeDelta);

}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation

{

    static NSString *ID = @"MYID";

    MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:ID];

    if (annotationView == nil) {

        annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:ID];

        annotationView.canShowCallout = YES;

    }

    annotationView.annotation = annotation;

    if ([annotation isKindOfClass:[MyAnnotation class]]) {

        // 这个是是标注周围的车 标注周围的车或者商家

        annotationView.image = [UIImage imageNamed:@"ic_category_1.png"];

    } else {

        // 返回nil，表示标注当前位置ic_category_78  标注当前位置

        annotationView.image = [UIImage imageNamed:@"ic_category_78"];

        //return nil;

    }
return annotationView;
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view

{

    MyAnnotation *anno = (MyAnnotation *)view.annotation;

    NSLog(@"%@",anno.title);

}
- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}
@end

#import <Foundation/Foundation.h>

#import <MapKit/MapKit.h>

@interface MyAnnotation : NSObject<MKAnnotation>

@property (nonatomic) CLLocationCoordinate2D coordinate;

@property (nonatomic, copy) NSString *title;

@end

苹果地图2，定位，标注，返回中心。,码迷,mamicode.com