iOS background view not updated using NSTimer while scanning the bluetooth DEVICE -
i trying work on getting bluetooth scanning page pair ble device using bluetooth. have found nsuinteger [ _ble.scannedperipheral count ] change while scanning. however, when comes execution, background view images , pages cannot change. please tell me other wayout make page change if variable showing available ble devices changes 0 1,2 or 3 ?
the below code : (only relevant)
- (void)viewdidappear:(bool)animated { if (_ble) { _ble.delegate = (id) self; _ble.btstatus = bt_idle; [_ble startscanning]; } [nstimer scheduledtimerwithtimeinterval:0.2f target:self selector:@selector(reloaddata) userinfo:nil repeats:yes]; } -(void) reloaddata { dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{ // time consuming workout dispatch_async(dispatch_get_main_queue(), ^{ // ui update workout bluetooth scanning if( [ _ble.scannedperipheral count ] > 0 ){ [self stopanimatingimages]; [self settapdemo : [uiimage imagenamed:@"pairing_d.png"] : @"pairing" : @"#c4cccf"] ; }else{ [self settapdemo : [self loadingimage] : @"pairing" : @"#c4cccf"] ; [self animateimages]; } }); }); } - (void) settapdemo: (uiimage *) cover : (nsstring *) title : (nsstring *) colorhex{ image = [uiimage imagenamed:@"shaded_cal.png"]; imagea = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; _container = [[uiview alloc] initwithframe:[self.view bounds]]; [imagea setimage:cover]; imagea.userinteractionenabled = yes; uitapgesturerecognizer *mygesture = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(touchesbegan:)]; mygesture.numberoftapsrequired = 1; mygesture.delegate=self; [imagea addgesturerecognizer:mygesture]; [imagea setcontentmode:uiviewcontentmodescaleaspectfill]; mylabelq = [self constructlabelt:title:0.27:0.08: colorhex:25]; mylabelback =[self constructlabelt:@"back":0.04:0.01:@"#c4cccf":18] ; if( blecount > 0){ for(nsuinteger = 0 ; < [ _ble.scannedperipheral count ] ; ++){ deviceperiperal *device; nsstring *uuid = [_ble.scannedperipheralkey objectatindex:i]; nslog (@"device uuid = %@", uuid); if (uuid) { device = [_ble.scannedperipheral objectforkey:uuid]; nsdata * ssx = device.advertdata ; device.rowindex = i; nslog (@"device advert = %@", ssx); if([ssx length] > 0){ nsdata *macd = [ssx subdatawithrange:nsmakerange(0, 6)]; nsdata *paird = [ssx subdatawithrange:nsmakerange(6, 1)]; nsstring* newstr = [self hexrepresentationwithspaces:paird : no]; nsstring* newmac = [self hexrepresentationwithspaces:macd : yes]; nslog (@"newstr = %@", newstr ); nslog (@"newmac = %@", newmac ); _checksumbyte = [self calculatechecksum:newmac]; } nslog (@"device = %@", device.uuid); if (device ) { uiimage *dimage = [uiimage imagenamed:@"device_u.png"]; float change = 0.15*i; float yposition = 0.25 + change ; [imagea addsubview:[self deviceget:dimage:device.devicename: 0.40 : yposition : @"#c4cccf"]]; } } } //uiimage *dimage = [uiimage imagenamed:@"device_u.png"]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.25 : @"#c4cccf"]]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.40 : @"#c4cccf"]]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.55 : @"#c4cccf"]]; //[imagea addsubview:mylabels3]; mylabels1 = [self constructlabelt:@"spotted":0.27:0.723: colorhex:25]; mylabels2 =[self constructlabelt:@"(choose 1 want connect)":0.55:0.76:@"#c4cccf":10] ; mylabels3 = [self constructlabelt:@"devices":0.30:0.76: colorhex:25]; }else{ mylabels1 = [self constructlabelt:@"scanning":0.27:0.723: colorhex:25]; mylabels2 =[self constructlabelt:@"devices":0.51:0.76:@"#c4cccf":25] ; mylabels3 = [self constructlabelt:@"for":0.30:0.76: colorhex:25]; } [imagea addsubview:mylabelq]; [imagea addsubview:mylabelback]; [imagea addsubview:mylabels1]; [imagea addsubview:mylabels2]; [imagea addsubview:mylabels3]; [_container addsubview:imagea]; [self.view addsubview:_container]; [self.view sendsubviewtoback:_container]; }
each time call settapdemo :::, create new _container view , added self.view . because never remove old 1 super view before initialise again, self.view contains more , more subviews timer repeats consume memory app crash.
further, [self.view sendsubviewtoback:_container] called each time while timer fired, , never remove old _container, new _container hidden behind result.
in conclusion, guess did create updated _container while [ _ble.scannedperipheral count ] changed staying behind other subviews. may try modify code this:
- (void) settapdemo: (uiimage *) cover : (nsstring *) title : (nsstring *) colorhex{ // remove old _container view if (_container) [_container removefromsuperview]; image = [uiimage imagenamed:@"shaded_cal.png"]; imagea = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; _container = [[uiview alloc] initwithframe:[self.view bounds]]; [imagea setimage:cover]; imagea.userinteractionenabled = yes; uitapgesturerecognizer *mygesture = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(touchesbegan:)]; mygesture.numberoftapsrequired = 1; mygesture.delegate=self; [imagea addgesturerecognizer:mygesture]; [imagea setcontentmode:uiviewcontentmodescaleaspectfill]; mylabelq = [self constructlabelt:title:0.27:0.08: colorhex:25]; mylabelback =[self constructlabelt:@"back":0.04:0.01:@"#c4cccf":18] ; if( blecount > 0){ for(nsuinteger = 0 ; < [ _ble.scannedperipheral count ] ; ++){ deviceperiperal *device; nsstring *uuid = [_ble.scannedperipheralkey objectatindex:i]; nslog (@"device uuid = %@", uuid); if (uuid) { device = [_ble.scannedperipheral objectforkey:uuid]; nsdata * ssx = device.advertdata ; device.rowindex = i; nslog (@"device advert = %@", ssx); if([ssx length] > 0){ nsdata *macd = [ssx subdatawithrange:nsmakerange(0, 6)]; nsdata *paird = [ssx subdatawithrange:nsmakerange(6, 1)]; nsstring* newstr = [self hexrepresentationwithspaces:paird : no]; nsstring* newmac = [self hexrepresentationwithspaces:macd : yes]; nslog (@"newstr = %@", newstr ); nslog (@"newmac = %@", newmac ); _checksumbyte = [self calculatechecksum:newmac]; } nslog (@"device = %@", device.uuid); if (device ) { uiimage *dimage = [uiimage imagenamed:@"device_u.png"]; float change = 0.15*i; float yposition = 0.25 + change ; [imagea addsubview:[self deviceget:dimage:device.devicename: 0.40 : yposition : @"#c4cccf"]]; } } } //uiimage *dimage = [uiimage imagenamed:@"device_u.png"]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.25 : @"#c4cccf"]]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.40 : @"#c4cccf"]]; //[imagea addsubview:[self deviceget:dimage:@"x": 0.40 : 0.55 : @"#c4cccf"]]; //[imagea addsubview:mylabels3]; mylabels1 = [self constructlabelt:@"spotted":0.27:0.723: colorhex:25]; mylabels2 =[self constructlabelt:@"(choose 1 want connect)":0.55:0.76:@"#c4cccf":10] ; mylabels3 = [self constructlabelt:@"devices":0.30:0.76: colorhex:25]; }else{ mylabels1 = [self constructlabelt:@"scanning":0.27:0.723: colorhex:25]; mylabels2 =[self constructlabelt:@"devices":0.51:0.76:@"#c4cccf":25] ; mylabels3 = [self constructlabelt:@"for":0.30:0.76: colorhex:25]; } [imagea addsubview:mylabelq]; [imagea addsubview:mylabelback]; [imagea addsubview:mylabels1]; [imagea addsubview:mylabels2]; [imagea addsubview:mylabels3]; [_container addsubview:imagea]; //[self.view addsubview:_container]; //[self.view sendsubviewtoback:_container]; // 1 line of code can trick [self.view insertsubview:_container atindex:0]; }
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