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當我的用戶更改位置時，我需要將他的位置與從網絡中拉出的位置數組進行比較。然而，在我的appDelegate中，我不確定究竟在哪裏放置我的代碼，因爲我不確定當應用程序終止時調用或未調用哪些方法，但CLLocationManager仍然有效。在終止應用程序時在DidUpdateLocations中進行Web通話
具體來說，我需要輸入這個代碼，它實際上將被調用時，應用程序還是終止：
// alloc and init the various (Mutable)Array properties
self.locations = [[NSMutableArray alloc] init];
// Create new HomeModel object and assign it to _homeModel variable
_homeModel = [[DealsModel alloc] init];
// Set this view controller object as the delegate for the home model object
_homeModel.delegate = self;
// Call the download items method of the home model object
[_homeModel downloadItems];
的_homeModel然後將調用這個方法：
-(void)itemsDownloaded:(NSArray *)items
{
// This delegate method will get called when the items are finished downloading
// Set the downloaded items to the array
_locations = [items copy];
}
我將進一步編輯以將用戶的位置與位置陣列進行比較。
事情是，這個陣列的位置每週只更改一次。每當用戶的位置發生變化時，應用程序是否真的必須將其從網絡中拉出來？或者有沒有辦法來緩存這個，只有當它取消分配self.locations？
這是我現在有，但我覺得必須有一個更好的辦法：
@interface AppDelegate() <CLLocationManagerDelegate>
{
DealsModel *_homeModel;
}
@property BOOL didRunBefore;
@property CLLocationManager *locationManager;
@property NSMutableArray *deals;
@end
@implementation AppDelegate
-(void)itemsDownloaded:(NSArray *)items
{
// This delegate method will get called when the items are finished downloading
// Set the downloaded items to the array
_deals = [items copy];
[self compareSponsorLocations:_deals toUserLocation:[self.locationManager location]];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations {
if (!self.deals) {
// alloc and init the various (Mutable)Array properties
self.deals = [[NSMutableArray alloc] init];
// Create new HomeModel object and assign it to _homeModel variable
_homeModel = [[DealsModel alloc] init];
// Set this view controller object as the delegate for the home model object
_homeModel.delegate = self;
// Call the download items method of the home model object
[_homeModel downloadItems];
} else {
[self compareSponsorLocations:self.deals toUserLocation:[locations lastObject]];
}
}
- (void) compareSponsorLocations: (NSArray *) array toUserLocation: (CLLocation *) location
{
for (Deal *deal in array) {
NSLog(@"%@", deal.name);
}
NSLog(@"%@", location.description);
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
...