iOS-如何保证app进入后台后持续运行
iOS-如何保证app进⼊后台后持续运⾏
下⾯通过地图持续定位的⽅式，完成App进⼊后台保存成功继续运⾏：
第⼀步：开启后台服务
第⼆步：在info.l    <key>NSLocationAlwaysUsageDescription</key>
<string>请允许使⽤定位功能</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>请允许使⽤定位功能</string<key>UIBackgroundModes</key>
<key>UIBackgroundModes</key>
<array>
<string>fetch</string>
<string>location</string>
</array>
第三步：创建CLLocationManager对象，并且设置CLLocationManagerDelegate的代理
#import <CoreLocation/CLLocationManager.h>
<CLLocationManagerDelegate>
@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic , strong)dispatch_source_t timer;
#pragma mark - 应⽤进⼊后台执⾏定位保证进程不被系统kill
-(void)rjxContinuedLocationManager
{
//1.创建定位管理对象
_locationManager = [[CLLocationManager alloc]init];
/
/2.设置属性 distanceFilter、desiredAccuracy
[_locationManager setDistanceFilter:kCLDistanceFilterNone];//实时更新定位位置
[_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];//定位精确度
if([_manager respondsToSelector:@selector(requestAlwaysAuthorization)]){
[_locationManager requestAlwaysAuthorization];
}
豌豆角//该模式是抵抗程序在后台被杀，申明不能够被暂停
_locationManager.pausesLocationUpdatesAutomatically = NO;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8) {
//在后台也可定位
[_locationManager requestAlwaysAuthorization];
}
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9) {
_locationManager.allowsBackgroundLocationUpdates = YES;
}中秋节几月几号
//3.设置代理
_locationManager.delegate = self;
//4.开始定位
[_locationManager startUpdatingLocation];
//5.获取朝向
[_locationManager startUpdatingHeading];
NSLog(@"_locationManager---%@",_locationManager);
/
/ ⼀.请求接⼝获取时间间隔，开启定时器，纪录当前当前的时间
[self startTimeWithInterval:5.0];
}
// 开启定时器
- (void)startTimeWithInterval:(double)time {
// 纪录当前的时间
self.startdata = [NSDate date];
NSTimeInterval period = time;//设置时间间隔
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
dispatch_source_set_timer(_timer, DISPATCH_TIME_NOW, period * NSEC_PER_SEC, 0 * NSEC_PER_SEC);
dispatch_source_set_event_handler(_timer, ^{
dispatch_async(dispatch_get_main_queue(), ^{
// 调⽤上传步数的⽅法
NSLog(@"11111");
[self getHealthStep];
});
});
dispatch_resume(_timer);
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.小学家长会班主任发言稿
NSLog(@"2-------applicationDidEnterBackground");
UIApplication *app = [UIApplication sharedApplication];
__block  UIBackgroundTaskIdentifier bgTask;
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid){
bgTask = UIBackgroundTaskInvalid;
NSLog(@"=========");
}
});
administrator密码忘记
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{珍稀植物
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid){
bgTask = UIBackgroundTaskInvalid;
NSLog(@"---------------");
}
});
});
[self.locationManager startUpdatingLocation];
}
第四步：在didFinishLaunchingWithOptions⽅法⾥⾯调⽤rjxContinuedLocationManager这个⽅法- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//地图定位
[self rjxContinuedLocationManager];
/** 应⽤进⼊后台执⾏定位保证进程不被系统kill */
快板打法[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self.locationManager startUpdatingLocation];
return YES;
}

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。