iOS 10 以上跳转系统设置，最新方法

 NSURL *url = [[NSURL alloc] initWithString:UIApplicationOpenSettingsURLString];// 跳转至系统设置
 if([[UIApplication sharedApplication]canOpenURL:url]){
 [[UIApplication sharedApplication]openURL:url];
 }
 

//NSURL *url = [NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"];// iOS 10 弃用
如果用 这个方法 就会报以下错误
-canOpenURL: failed for URL: "prefs:root=LOCATION_SERVICES" - error: "The operation couldn’t be completed. (OSStatus error -10814.)"