Subclassed MKTileOverlay不在地圖上顯示

Question

我想從我們的WMS服務器顯示WMS瓷磚。我用舊的MKOverlay實現了這一點，但我現在試圖更新它以使用MKTileOverlay，但我無法獲取要顯示的圖塊。這裏是我的課：

@interface WMSTileOverlay() 

@property (strong, nonatomic) NSString *API, *mapContext, *IDToken; 

@end 

@implementation WMSTileOverlay 

-(instancetype)initWithAPI:(NSString *)API IDToken:(NSString *)IDToken andMapContext:(NSString *)mapContext { 
    self = [super init]; 

    if (self) { 
     self.API = API; 
     self.mapContext = mapContext; 
     self.IDToken = IDToken; 
    } 

    return self; 
} 

-(NSURL *)URLForTilePath:(MKTileOverlayPath)path { 
    DLog(@"fired"); 

    DLog(@"path | x:%ld y: %ld z: %ld scale: %f", (long)path.x, (long)path.y, (long)path.z, path.contentScaleFactor); 

    NSString *resolvedURL = [self createWMSURLStringForTileX:path.x tileY:path.y zoomLevel:path.z]; 
    DLog(@"resolvedURL: %@", resolvedURL); 
    return [NSURL URLWithString:resolvedURL]; 
} 

-(NSString *)createWMSURLStringForTileX:(NSInteger)tileX tileY:(NSInteger)tileY zoomLevel:(NSInteger)zoomLevel { 
    NSString *WMSservice = @"wms"; 
    NSString *WMSversion = @"1.1.1"; 
    NSString *WMSrequest = @"GetMap"; 
    NSString *WMSMode = @"tiled"; 
    NSString *WMSTile = [NSString stringWithFormat:@"%d+%d+%d", tileX, tileY, zoomLevel]; 
    NSString *WMSFormat = @"image/png"; 
    NSString *WMSTransparancy = @"true"; 
    NSString *WMSSRS = @"EPSG:4326"; 
    NSString *WMSLayer = @"displayimg"; 

    DLog(@"%@", [NSString stringWithFormat:@"%@?map=%@&idtoken=%@&service=%@&version=%@&request=%@&SRS=%@&layers=%@&mode=%@&tile=%@&format=%@&transparent=%@", self.API, self.mapContext, self.IDToken, WMSservice, WMSversion, WMSrequest, WMSSRS, WMSLayer, WMSMode, WMSTile, WMSFormat, WMSTransparancy]); 

    return [NSString stringWithFormat:@"%@?map=%@&idtoken=%@&service=%@&version=%@&request=%@&SRS=%@&layers=%@&mode=%@&tile=%@&format=%@&transparent=%@", self.API, self.mapContext, self.IDToken, WMSservice, WMSversion, WMSrequest, WMSSRS, WMSLayer, WMSMode, WMSTile, WMSFormat, WMSTransparancy]; 

} 

-(void)loadTileAtPath:(MKTileOverlayPath)path result:(void (^)(NSData *, NSError *))result { 
    DLog(@"fired"); 

    NSURLRequest *request = [NSURLRequest requestWithURL:[self URLForTilePath:path]]; 
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 
     if (connectionError) { 
      result (nil, connectionError); 
     } 
     else { 
      result (data, nil); 
     } 
    }]; 
} 

@end 

我生成的瓦片請求的網址：

DEBUG | -[WMSTileOverlay URLForTilePath:] | path | x:60597 y: 92299 z: 18 scale: 1.000000 
DEBUG | -[WMSTileOverlay createWMSURLStringForTileX:tileY:zoomLevel:] | https://WMS_SERVER?map=yupv9bvejd15fbmc0i1k62bvmdsbcafn.map&idtoken=852a468e65e5ed4023e7b704ea8c768f53c2df13da44e2f0c68fb5a559a130c8&service=wms&version=1.1.1&request=GetMap&SRS=EPSG:4326&layers=displayimg&mode=tiled&tile=60597+92299+18&format=image/png&transparent=true 

我得到的數據備份（其相同的URL電話我就與老MKOverlay類的作品）並且該類正在傳回數據。但沒有瓷磚正在繪製。我創建類是這樣的：

WMSTileOverlay *wmsTileOverlay = [[WMSTileOverlay alloc] initWithAPI:functionCall.API IDToken:functionCall.IDToken andMapContext:[self.mapper fetchMapContextForState:self.activeBoundarier.state]]; 
wmsTileOverlay.canReplaceMapContent = FALSE; 

[self.mapView insertOverlay:wmsTileOverlay atIndex:0]; 

和實施方法mapView:rendererForOverlay:：

-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay { 
    DLog(@"fired"); 

    if ([overlay isKindOfClass:[MKTileOverlay class]]) { 
     MKTileOverlay *tileOverlay = (MKTileOverlay *)overlay; 

     if ([tileOverlay isKindOfClass:[WMSTileOverlay class]]) { 
      WMSTileOverlay *wmsTileOverlay = (WMSTileOverlay *)tileOverlay; 
      DLog(@"wmsTileOverlay.URLTemplate: %@", wmsTileOverlay.URLTemplate); 

      MKTileOverlayRenderer *renderer = [[MKTileOverlayRenderer alloc] initWithTileOverlay:tileOverlay]; 

      return renderer; 
     } 
    } 

    return nil; 
} 

我在做什麼錯？

Answer 1

您是否設置了MKMapView代表並且是mapView:rendererForOverlay:？

我的工作和你一樣，在我身邊工作得很好。

#pragma mark - UIViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    WMSTileOverlay *overlay = [WMSTileOverlay new]; 
    overlay.canReplaceMapContent = YES; 

    [self.mapView addOverlay:overlay level:MKOverlayLevelAboveLabels]; 
} 

#pragma mark - MKMapViewDelegate 

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id <MKOverlay>)overlay 
{ 
    if ([overlay isKindOfClass:[WMSTileOverlay class]]) { 
     return [[MKTileOverlayRenderer alloc] initWithTileOverlay:overlay]; 
    } 

    return nil; 
} 

而且，

- (NSURL *)URLForTilePath:(MKTileOverlayPath)path 
{ 
    double left, bottom, right, top; 

    // Conversion to bbox mechanism 
    // ... 

    NSString *urlString = [NSString stringWithFormat:@"%@&bbox=%f,%f,%f,%f", kWMSServerURL, left, bottom, right, top]; 

    return [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 
} 

- (void)loadTileAtPath:(MKTileOverlayPath)path result:(void (^)(NSData *data, NSError *error))result 
{ 
    if (!result) { 
     return; 
    } 

    // Cache 
    // ... 
    if (cache) { 
     // ...  
    } else { 
     NSURLRequest *request = [NSURLRequest requestWithURL:[self URLForTilePath:path]]; 
     [NSURLConnection sendAsynchronousRequest:request queue:self.operationQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 
      // Caching mechanism 
      // ... 

      result(data, connectionError); 
     }]; 
    } 
}