我已經制定了下面的代碼:Mapkit - 縮放級別不斷復位
-(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];
}
最初的縮放級別設置爲每個在viewDidLoad中的代碼。如何存儲用戶放大或縮小的縮放級別ID,因爲每次接收到新的位置更新時縮放級別都將被重置。
是否有檢測用戶放大或縮小的方法?
UPDATE
我已經添加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);
}
日誌中輸出的樣子:
2010-11-01 15:17:29.317 Legginit [2948:307]地區DID更改。
Center現在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:30.553 Legginit [2948:307] Region DID change。
Center現在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:31.063 Legginit [2948:307] Region DID change。
中心現已54.181150,-8.483177,德爾塔= 0.050000,0.050000
2010-11-01 15:17:31.653 Legginit [2948:307]的整數區域DID變化。
Center現在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:32.582 Legginit [2948:307] Region DID change。
Center現在是54.181150,-8.483177,Deltas = 0.050000,0.050000
2010-11-01 15:17:33.608 Legginit [2948:307] Region DID change。
Centre現在是54.181150,-8.483177,Deltas = 0.050000,0.050000
當我放大電話時,我期待Delta值發生變化,但仍保持在0.05。我誤解了這是如何工作的。我認爲我可以捕獲Delta值並存儲它們,這樣如果用戶退出並重新輸入地圖,我可以重置縮放級別。
問候, 斯蒂芬
aBit顯然,我走下了使用regionWillChangeAnimated的道路。我上面更新了我的問題,如果你有一分鐘,你能否快速查看。我不認爲我完全理解它是如何工作的。 – Stephen 2010-11-01 15:41:07
我已經更新了答案。 – Anna 2010-11-01 16:15:31