比较两个城市背景下的两个地点
比较两个城市背景下的两个地点
提问于 2016-02-21 11:22:03
我有一个应用程序，用户保存一个位置并设置接收通知的半径:1公里，5公里(如果他之前保存的位置和他当前位于设置的半径中的位置，用户将收到通知)和" city“(如果他之前保存的位置所在的城市和他当前所在的城市是同一个城市，用户将收到通知)。
注意:我使用的是Google Maps iOS SDK。
我有一个名为-sendNotificationIfNeeded的方法，它检查是否发送通知，代码：
-(void)sendNotificationIfNeeded
{
if (self.muteEnabled==YES) { //Check if the user muted the app
NSLog(@"Mute enabled");
return;
}
//Important part:
if([self checkIfUserInRadiusForLocation:[self.savedLocations objectAtIndex:0]])
{
UILocalNotification *notification=[self createNotification];
[self sendNotification:notification];
}
}方法checkIfUserInRadiusForLocation检查savedLocation (CLCircularRegion)的半径，并检查用户是否在此半径内，代码：
-(BOOL)checkIfUserInRadiusForLocation:(SavedLocation*)location
{
if(location.radiusString isEqualToString:@“1KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
}else if(location.radiusString isEqualToString:@“5KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
//Important part:
}else if(location.radiusString isEqualToString:@“City”)
{
if([self checkIfUserCityIsSameToLocation:location)
{
return YES;
}
}
return NO;
}checkIfUserCityIsSameToLocation:方法查找savedLocation城市和用户的位置城市，并检查它们是否相等(问题在这里)，代码：
-(BOOL)checkIfUserCityIsSameToLocation:(savedLocation*)location
{
//Checking user's city
__block NSString *userCity;
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:self.locationManager.location.coordinate completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(@"%@",[error description]);
}
userCity=[[[response results] firstObject] locality];
}];
//Checking savedLocation’s city
__block NSString *savedLocationCity;
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:location.circularRegion.center completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(@"%@",[error description]);
}
savedLocationCity=[[[response results] firstObject] locality];
NSLog(@"");
}];
if ([userCity isEqualToString:savedLocationCity]) { //Both string cities are nil
Return YES;
}else
{
Return No
}
}问题是，当应用程序到达checkIfUserCityIsSameToLocation:上的checkIfUserCityIsSameToLocation:状态时，userCity和savedLocationCity都是零(因为reverseGeocodeCoordinate: completionHandler:方法运行在后台线程上)。
我想不出怎么解决，
如果有人能帮我做这件事，我会好好学习的。
非常感谢!
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-02-21 11:48:48
这样做吧：
-(BOOL)checkIfUserInRadiusForLocation:(SavedLocation*)location userCity: (NSString *) userCity locationCity: (NSString *) locationCity
{
if(location.radiusString isEqualToString:@“1KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
}else if(location.radiusString isEqualToString:@“5KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
//Important part:
}else if(location.radiusString isEqualToString:@“City”)
{
if([userCity isEqual: locationCity])
{
return YES;
}
}
return NO;
}
-(void)sendNotificationIfNeeded
{
if (self.muteEnabled==YES) { //Check if the user muted the app
NSLog(@"Mute enabled");
return;
}
SavedLocation* location = [self.savedLocations objectAtIndex:0];
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:self.locationManager.location.coordinate completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(@"%@",[error description]);
}
NSString *userCity=[[[response results] firstObject] locality];
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:location.circularRegion.center completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(@"%@",[error description]);
}
NSString *savedLocationCity=[[[response results] firstObject] locality];
if([self checkIfUserInRadiusForLocation:location userCity: userCity locationCity: savedLocationCity])
{
UILocalNotification *notification=[self createNotification];
[self sendNotification:notification];
}
}];
}];
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/35535460
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