我的应用在iOS 7上运行良好,但在iOS 8 SDK上却无法运行。
CLLocationManager不返回位置,我没有看到我的应用程序下设置->位置服务。我在这个问题上做了谷歌搜索,但没有任何结果。会有什么问题呢?
我的应用在iOS 7上运行良好,但在iOS 8 SDK上却无法运行。
CLLocationManager不返回位置,我没有看到我的应用程序下设置->位置服务。我在这个问题上做了谷歌搜索,但没有任何结果。会有什么问题呢?
当前回答
// ** Don't forget to add NSLocationWhenInUseUsageDescription in MyApp-Info.plist and give it a string
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
// Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7.
if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
[self.locationManager requestWhenInUseAuthorization];
}
[self.locationManager startUpdatingLocation];
// Location Manager Delegate Methods
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
NSLog(@"%@", [locations lastObject]);
}
其他回答
我的解决方案可以在Xcode 5中编译:
#ifdef __IPHONE_8_0
NSUInteger code = [CLLocationManager authorizationStatus];
if (code == kCLAuthorizationStatusNotDetermined && ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)] || [self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])) {
// choose one request according to your business.
if([[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"]){
[self.locationManager requestAlwaysAuthorization];
} else if([[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationWhenInUseUsageDescription"]) {
[self.locationManager requestWhenInUseAuthorization];
} else {
NSLog(@"Info.plist does not contain NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription");
}
}
#endif
[self.locationManager startUpdatingLocation];
我也因为同样的问题而抓狂。Xcode给出错误:
试图启动MapKit位置更新而没有提示 位置授权。必须调用-[CLLocationManager requestWhenInUseAuthorization]或-[CLLocationManager . request requestAlwaysAuthorization]。
但即使实现了上述方法之一,它也不会提示用户,除非信息中有条目。NSLocationAlwaysUsageDescription或NSLocationWhenInUseUsageDescription。
添加以下行到您的信息。Plist,其中字符串值代表您需要访问用户位置的原因
<key>NSLocationWhenInUseUsageDescription</key>
<string>This application requires location services to work</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>This application requires location services to work</string>
我认为自从我在Xcode 5中开始这个项目以来,这些条目可能已经丢失了。我猜Xcode 6可能会为这些键添加默认条目,但还没有确认。
你可以在这里找到更多关于这两个设置的信息
解决方案与向后兼容,不产生Xcode警告:
SEL requestSelector = NSSelectorFromString(@"requestWhenInUseAuthorization");
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined &&
[self.locationManager respondsToSelector:requestSelector]) {
((void (*)(id, SEL))[self.locationManager methodForSelector:requestSelector])(self.locationManager, requestSelector);
[self.locationManager startUpdatingLocation];
} else {
[self.locationManager startUpdatingLocation];
}
在Info.plist中设置NSLocationWhenInUseUsageDescription键。
对于iOS版本11.0+: 在Info.plist中设置NSLocationAlwaysAndWhenInUseUsageDescription键。还有另外2把钥匙。
我最终解决了自己的问题。
显然,在iOS 8 SDK中,在开始位置更新之前需要调用CLLocationManager上的requestAlwaysAuthorization(用于后台位置)或requestWhenInUseAuthorization(仅用于前台位置)。
在Info中还需要NSLocationAlwaysUsageDescription或NSLocationWhenInUseUsageDescription键。Plist并在提示符中显示一条消息。加上这些就解决了我的问题。
更多详细信息,请查看:Core-Location-Manager-Changes-in-ios-8
为了确保这与iOS 7向后兼容,你应该检查用户运行的是iOS 8还是iOS 7。例如:
#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
//In ViewDidLoad
if(IS_OS_8_OR_LATER) {
[self.locationManager requestAlwaysAuthorization];
}
[self.locationManager startUpdatingLocation];