1 @interface MyPlanarCodeViewController ()
2 //定义计时器
3 @property (nonatomic, strong) NSTimer *timer;
4 @end
5
6 @implementation MyPlanarCodeViewController
7 -(ApiGetCodeExcutor *)apiGetCodeExcutor{
8 if (_apiGetCodeExcutor == nil) {
9 _apiGetCodeExcutor = [ApiGetCodeExcutor excutor];
10 }
11 return _apiGetCodeExcutor;
12 }
13 - (void)viewDidLoad {
14 [super viewDidLoad];
15 //启动计时器
16 [self startTimer];
17 }
18 - (void)startTimer {
19 //60秒调用一次timerRepeat:方法
20 _timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(timerRepeat:) userInfo:nil repeats:YES];
21 [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSDefaultRunLoopMode];
22 [_timer fire];
23 }
24 //重复进行的操作放到这里
25 -(void)timerRepeat:(NSTimer *)timer {
26 ApiRequestStateHandler * apiRequest = [ApiRequestStateHandler apiRequestStateHandlerOnSuccess:^(ApiExcutor *apiExcutor, BOOL *cache) {
27 if(self.apiGetCodeExcutor.status == 1){
28 [self.codeImageView sd_setImageWithURL:[NSURL URLWithString:self.apiGetCodeExcutor.imageURL] placeholderImage:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
29 [self hideHud];
30 [[SDImageCache sharedImageCache] removeImageForKey:self.apiGetCodeExcutor.imageURL];
31 }];
32 self.codeImageView.userInteractionEnabled = NO;
33 }else{
34 [self hideHud];
35 [self showAlertViewWithTitle:@"请等待老师开启签到后点击二维码区域重新获取"];
36 }
37 } onFail:^(ApiExcutor *apiExcutor, NSError *error) {
38 //
39 [self hideHud];
40 [self showHint:@"网络通讯异常"];
41 }];
42 [self.apiGetCodeExcutor getQRCodeWithUserid:[CUserManager sharedManager].user.userid withCourseId:self.course.sjddid type:self.type withDeviceIdentifier:device withApiRequestStateHandler:apiRequest];
43 }
44 //销毁计时器。避免计时器一直在运行状态
45 - (void)viewDidDisappear:(BOOL)animated {
46 [_timer invalidate];
47 _timer = nil ;
48 }
49 //- (void)dealloc {
50 // [_timer invalidate];
51 // _timer = nil;
52 //}
53 @end
