我已经制定了下面的代码:Mapkit - 缩放级别不断复位
-(void)viewDidLoad
{
//Set Zoom level using Span
MKCoordinateSpan span;
span.latitudeDelta = 0.05;
span.longitudeDelta = 0.05;
region.span = span;
}
-(void)locationChange:(CLLocation *)newLocation: (CLLocation *)oldLocation
{
// This zooms in on the users current loation.
curlocation = newLocation.coordinate;
region.center = curlocation;
[_mapView setRegion:region animated:TRUE];
}
最初的缩放级别设置为每个在viewDidLoad中的代码。如何存储用户放大或缩小的缩放级别ID,因为每次接收到新的位置更新时缩放级别都将被重置。
是否有检测用户放大或缩小的方法?
UPDATE
我已经添加regionDidChangeAnimated方法如下:
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
NSLog(@"Region DID change. Center is now %f,%f, Deltas=%f,%f",
region.center.latitude, region.center.longitude,
region.span.latitudeDelta, region.span.longitudeDelta);
}
日志中输出的样子:
2010-11-01 15:17:29.317 Legginit [2948:307]地区DID更改。
Center现在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:30.553 Legginit [2948:307] Region DID change。
Center现在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:31.063 Legginit [2948:307] Region DID change。
中心现已54.181150,-8.483177,德尔塔= 0.050000,0.050000
2010-11-01 15:17:31.653 Legginit [2948:307]的整数区域DID变化。
Center现在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:32.582 Legginit [2948:307] Region DID change。
Center现在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:33.608 Legginit [2948:307] Region DID change。
Centre现在是54.181150,-8.483177,Deltas = 0.050000,0.050000
当我放大电话时,我期待Delta值发生变化,但仍保持在0.05。我误解了这是如何工作的。我认为我可以捕获Delta值并存储它们,这样如果用户退出并重新输入地图,我可以重置缩放级别。
问候, 斯蒂芬
aBit显然,我走下了使用regionWillChangeAnimated的道路。我上面更新了我的问题,如果你有一分钟,你能否快速查看。我不认为我完全理解它是如何工作的。 – Stephen 2010-11-01 15:41:07
我已经更新了答案。 – Anna 2010-11-01 16:15:31