iOS 利用高德地图WMS服务
Demo: https://github.com/xushiyou23/AMapTesting
转：
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Bear_861110453/article/details/81564605
本文主要介绍通过自定义高德地图 MATileOverlay 接口，添加 WMS 服务到地图上。
自定义类 WMSTileOverlayUtil，继承自高德地图接口 MATileOverlay，主要重载函数： - (NSURL *)URLForTilePath:(MATileOverlayPath)path; - (void)loadTileAtPath:(MATileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result;，见代码注释。
#import <Foundation/Foundation.h>
#import <MAMapKit/MATileOverlay.h>
@interface WMSTileOverlayUtil : MATileOverlay
- (id)initWithRootURL:(NSString *)rootRUL;
/**
* @brief 以tile path生成URL。用于加载tile,此方法默认填充URLTemplate
* @param path tile path
* @return 以tile path生成tileOverlay
*/
- (NSURL *)URLForTilePath:(MATileOverlayPath)path;
@end#import "WMSTileOverlayUtil.h"
#import <MAMapKit/MAMapKit.h>
#import <AMapFoundationKit/AMapFoundationKit.h>
#import <math.h>
#import "Api.h"
@implementation WMSTileOverlayUtil
{
NSString * rootURL;
NSInteger titleSize; // = 256
double initialResolution; // = 156543.03392804062;//2*Math.PI*6378137/titleSize;
double originShift; // = 20037508.342789244;//2*Math.PI*6378137/2.0; 周长的一半
double HALF_PI; // = Math.PI / 2.0;
double RAD_PER_DEGREE; // = Math.PI / 180.0;
double METER_PER_DEGREE; // = originShift / 180.0;//一度多少米
double DEGREE_PER_METER; // = 180.0 / originShift;//一米多少度
}
- (id)initWithRootURL:(NSString *)rootRUL {
self = [super init];
if (self) {
rootURL = rootRUL;
titleSize = 256;
initialResolution = 156543.03392804062;
originShift = 20037508.342789244;
HALF_PI = M_PI_2;
RAD_PER_DEGREE = M_PI / 180.0;
METER_PER_DEGREE = originShift / 180.0;
DEGREE_PER_METER = 180.0 / originShift;
}
return self;
}
/**
* @brief 以tile path生成URL。用于加载tile,此方法默认填充URLTemplate
* @param path tile path
* @return 以tile path生成tileOverlay
*/
- (NSURL *)URLForTilePath:(MATileOverlayPath)path {
NSString * strURL = [[NSString alloc] initWithFormat:@"%@%@", rootURL, [self titleBoundsByX:path.x
Y:path.y
Z:path.z]];
NSURL * url = [NSURL URLWithString:strURL];
return url;
}
/**
* @brief 加载被请求的tile,并以tile数据或加载tile失败error访问回调block;默认实现为首先用URLForTilePath去获取URL,然后用异步NSURLConnection加载tile
* @param path tile path
* @param result 用来传入tile数据或加载tile失败的error访问的回调block
*/
- (void)loadTileAtPath:(MATileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result {
if (path.z < 8) return;
NSURL * url = [self URLForTilePath:path];
NSString * strURL = url.absoluteString;
SuccessCallback successCallback = ^(id responseObject) {
UIImage * image = [UIImage imageWithData:responseObject];
NSData * data = UIImagePNGRepresentation(image);
result(data, nil);
};
FailureCallBack failureCallBack = ^(NSError *error) {
result(nil, error);
};
[Api GETWMSWith:strURL successCallback:successCallback failureCallBack:failureCallBack];
}
/**
* @brief 取消请求瓦片，当地图显示区域发生变化时，会取消显示区域外的瓦片的下载, 当disableOffScreenTileLoading=YES时会被调用。since 5.3.0
* @param path tile path
*/
- (void)cancelLoadOfTileAtPath:(MATileOverlayPath)path {
[super cancelLoadOfTileAtPath:path];
}
/**
* 根据瓦片的x/y等级返回瓦片范围
*
* @param tx x
* @param ty y
* @param zoom z
* @return url
*/
- (NSString *)titleBoundsByX:(NSInteger)tx Y:(NSInteger)ty Z:(NSInteger)zoom {
double minX = [self pixels2Meters:(tx * titleSize) zoom:zoom];
double maxY = -[self pixels2Meters:(ty * titleSize) zoom:zoom];
double maxX = [self pixels2Meters:((tx + 1) * titleSize) zoom:zoom];
double minY = -[self pixels2Meters:((ty + 1) * titleSize) zoom:zoom];
//转换成经纬度
minX = [self meters2Lon:minX];
minY = [self meters2Lat:minY];
maxX = [self meters2Lon:maxX];
maxY = [self meters2Lat:maxY];
//坐标转换工具类构造方法 Gps( WGS-84) 转 为高德地图需要的坐标
CLLocationCoordinate2D amapcoord = AMapCoordinateConvert(CLLocationCoordinate2DMake(minY, minX), AMapCoordinateTypeGPS);
minY = amapcoord.latitude;
minX = amapcoord.longitude;
CLLocationCoordinate2D maxAmapcoord = AMapCoordinateConvert(CLLocationCoordinate2DMake(maxY, maxX), AMapCoordinateTypeGPS);
maxY = maxAmapcoord.latitude;
maxX = maxAmapcoord.longitude;
NSString * result = [[NSString alloc] initWithFormat:@"%f,%f,%f,%f&width=256&height=256", minX, minY, maxX, maxY];
return result;
}
/**
* 根据像素、等级算出坐标
*
* @param p p
* @param zoom z
* @return double
*/
- (double)pixels2Meters:(NSInteger)p zoom:(NSInteger)zoom {
return p * [self resolution:zoom] - originShift;
}
/**
* 计算分辨率
*
* @param zoom z
* @return double
*/
- (double)resolution:(NSInteger)zoom {
return initialResolution / (pow(2, zoom));
}
/**
* X米转经纬度
*/
- (double)meters2Lon:(double)mx {
double lon = mx * DEGREE_PER_METER;
return lon;
}
/**
* Y米转经纬度
*/
- (double)meters2Lat:(double)my {
double lat = my * DEGREE_PER_METER;
lat = 180.0 / M_PI * (2 * atan(exp(lat * RAD_PER_DEGREE)) - HALF_PI);
return lat;
}
@end
其中，- (void)loadTileAtPath:(MATileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result; 函数中，使用自己写的 网络访问层去请求 wms 服务，并通过 result 函数贴到地图上。你也可以 改写成自己的网络访问层。
问题
为啥要重载 - (void)loadTileAtPath:(MATileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result; 函数，因为只是从载 - (NSURL *)URLForTilePath:(MATileOverlayPath)path; 生成 NSURL 后，loadTileAtPath 函数会去通过网络请求加载 wms 服务，然而，这一步网络请求会报错：NSURLConnection -errorcode -1004，且一个星期没有解决为啥报错，所以只得重写，如果有熟悉高德地图 api 的小伙伴能够给予解答，不胜感激。
注意
如果使用 AFNetworking 要注意修改支持的类型：
AFHTTPSessionManager * manager = [[AFHTTPSessionManager alloc] init];
AFHTTPResponseSerializer *serializer=[AFHTTPResponseSerializer serializer];
serializer.acceptableContentTypes = [NSSet setWithObject:@"image/png"];
manager.responseSerializer = serializer;
