[英]iOS background view not updated using NSTimer while scanning the bluetooth DEVICE
我正在尝试获取蓝牙扫描页面以使用蓝牙配对BLE设备。 我发现NSUInteger [ _ble.scannedPeripheral count ]
在扫描时确实发生了变化。 但是,在执行时,背景视图图像和页面甚至无法更改。 如果显示可用BLE设备的变量从0更改为1,2或3,您能否告诉我其他方法来更改页面?
以下是我的代码:(仅相关)
- (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 for 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 i = 0 ; i < [ _ble.scannedPeripheral count ] ; i ++){
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 the one you want to 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];
}
每次调用setTapDemo :::
,都将创建一个新的_container
视图,并将其添加到self.view
。 因为您从未在超级视图中删除旧视图,然后再对其进行初始化,所以self.view
包含越来越多的子视图(通过计时器重复),这些子视图最终会消耗所有内存,然后您的应用程序将崩溃。
此外,每次在触发计时器时都会调用[self.view sendSubviewToBack:_container]
,并且您永远不会删除旧的_container
,因此任何新的_container
都将被隐藏在后面。
总之,我想您在[ _ble.scannedPeripheral count ]
更改时确实创建了更新的_container
,但它仍位于其他子视图的后面。 因此,您可以尝试修改如下代码:
- (void) setTapDemo: (UIImage *) cover : (NSString *) title : (NSString *) colorHex{
// remove any 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 i = 0 ; i < [ _ble.scannedPeripheral count ] ; i ++){
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 the one you want to 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];
// One line of code can do this trick
[self.view insertSubview:_container atIndex:0];
}
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