Cocoa touch 如何在Route Me开源地图上查找已加载地图分幅的边界？

使用以下开源Route Me应用程序，我正在加载Maptiles

mapview = [[RMMapView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 460.0f)];
[mapview setBackgroundColor:[UIColor whiteColor]];
mapview.delegate = self;

id <RMTileSource> tileSource = [[[RMDBMapSource alloc] initWithPath:"@tilefile.db"] autorelease];

RMMapContents *rmcontents = [[RMMapContents alloc] initWithView:mapview tilesource:tileSource]; 
[self.view addSubview:mapview];//attached to mapview

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如何从上述方法中获得4角位置？

您必须自己编写这样一个方法：

RMSphericalTrapezium trap;
CLLocationCoordinate2D nePoint = CLLocationCoordinate2DMake(
    trap.northeast.latitude,
    trap.northeast.longitude);

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剩下的3个点，使用东南、西南和西北，与上面类似。

我的答案有用吗？请随意投票。

RMSphericalTrapezium trap;
CLLocationCoordinate2D nePoint = CLLocationCoordinate2DMake(
    trap.northeast.latitude,
    trap.northeast.longitude);