iOS学习之Map,定位，标记位置的使用
iOS上使用地图比Android要方便，只需要新建一个MKMapView,addSubView即可。这次要实现的效果如下：
1、添加地图
1.1 新一个Single View app ，选择默认项，创建后，在ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface ViewController : UIViewController
<MKMapViewDelegate, CLLocationManagerDelegate> {
MKMapView *map;
CLLocationManager *locationManager;
}
@end
1.2在ViewController.m中添加
- (void)viewDidLoad
{
map = [[MKMapView alloc] initWithFrame:[self.view bounds]];
map.showsUserLocation = YES;
map.mapType = MKMapTypeSatellite;
[self.view addSubview:map];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
运行：
OMG,看到的是世界地图。怎么定位到指定的位置呢？比如定位回来伟大的祖国首都？
这里map.mapType =MKMapTypeSatellite;我用到是卫星地图，可以使用标准的地图，
map.mapType =MKMapTypeStandard;
注意，如果此时你编译有错误，请拉到博客最后查看 ：5、 遇到的问题
2、定位到指定经纬度
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105); float zoomLevel = 0.02; MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel)); [map setRegion:[map regionThatFits:region] animated:YES];
这样，就我们就定位的了故宫了。
3、添加标注大头针
3.1 新建一个标注类：CustomAnnotation
按Command+N，继承NSObject。在CustomAnnotation.h 和CustomAnnotation.m文件添加如下代码：
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface CustomAnnotation : NSObject
<MKAnnotation>
{
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
-(id) initWithCoordinate:(CLLocationCoordinate2D) coords;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, retain) NSString *title;
@property (nonatomic, retain) NSString *subtitle;
@end
#import "CustomAnnotation.h"
@implementation CustomAnnotation
@synthesize coordinate, title, subtitle;
-(id) initWithCoordinate:(CLLocationCoordinate2D) coords
{
if (self = [super init]) {
coordinate = coords;
}
return self;
}
@end
3.1 使用大头针，
新建个方法添加大头针的
-(void)createAnnotationWithCoords:(CLLocationCoordinate2D) coords {
CustomAnnotation *annotation = [[CustomAnnotation alloc] initWithCoordinate:
coords];
annotation.title = @"标题";
annotation.subtitle = @"子标题";
[map addAnnotation:annotation];
}
调用
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105); float zoomLevel = 0.02; MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel)); [map setRegion:[map regionThatFits:region] animated:YES]; [self createAnnotationWithCoords:coords];这样我们就把大头针定位在故宫了
4、定位到当前位置并获取当前经纬度
前面我们已经添加了locationManager，现在在DidViewLoad里直接调用
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
[locationManager stopUpdatingLocation];
NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
NSLog(@"Lat: %@ Lng: %@", strLat, strLng);
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
NSLog(@"locError:%@", error);
}
运行，允许获取当前位置，打印log
2012-06-28 23:58:32.237 MapDemo[8202:11603] Lat: 39.9011 Lng: 116.3000如果不允许：打印出错误日志
2012-06-28 23:25:03.109 MapDemo[7531:11603] locError:Error Domain=kCLErrorDomain Code=1 "The operation couldn’t be completed. (kCLErrorDomain error 1.)"
定位后，移动到当前位置：
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
[locationManager stopUpdatingLocation];
NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
NSLog(@"Lat: %@ Lng: %@", strLat, strLng);
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(newLocation.coordinate.latitude,newLocation.coordinate.longitude);
float zoomLevel = 0.02;
MKCoordinateRegion region = MKCoordinateRegionMake(coords,MKCoordinateSpanMake(zoomLevel, zoomLevel));
[map setRegion:[map regionThatFits:region] animated:YES];
}
定位到了当前位置。
5、会遇到的问题：
运行是发现了编译错误：
Undefined symbols for architecture i386:
"_CLLocationCoordinate2DMake", referenced from:
-[ViewController viewDidLoad] in ViewController.o
-[ViewController locationManager:didUpdateToLocation:fromLocation:] in ViewController.o
"_OBJC_CLASS_$_MKMapView", referenced from:
objc-class-ref in ViewController.o
"_OBJC_CLASS_$_CLLocationManager", referenced from:
objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
这是为什么呢？没有添加对应的FrameWork。我使用的是4.3.2版本的XCode，添加方法如下：
选择项目，TARGETS ,点加号，添加两个framework
就好了。
如何发送IOS模拟器经纬度？
5.0以上的模拟器才能用这个功能，打开模拟：
这样就能发送模拟的当前位置了。
例子代码：http://download.csdn.net/detail/totogo2010/4400001点击打开链接
https://github.com/schelling/YcDemo/tree/master/MapDemo