Ios 为什么MKTileOverlay initWithURLTemplate:template返回nil？
我有如下代码：Ios 为什么MKTileOverlay initWithURLTemplate:template返回nil？,ios,mapkit,mktileoverlay,Ios,Mapkit,Mktileoverlay,我有如下代码： - (void)viewDidLoad { [super viewDidLoad]; NSString* template = [NSString stringWithFormat: @"http://my-map-server.com/?mode=tile&tilemode=gmap&tile={x}+{y}+{z}"] ; MKTileOverlay * overlay = [[MKTileOverlay alloc] initWithURLTemplat
- (void)viewDidLoad
{
[super viewDidLoad];
NSString* template = [NSString stringWithFormat: @"http://my-map-server.com/?mode=tile&tilemode=gmap&tile={x}+{y}+{z}"] ;
MKTileOverlay * overlay = [[MKTileOverlay alloc] initWithURLTemplate:template]; //returns nil
overlay.canReplaceMapContent = NO;
[mainMap addOverlay:overlay1 level:MKOverlayLevelAboveLabels];
}