I am developing an app using a data cable to link a camera. When I enter the page for the first time, I can detect the camera device, and then when I exit the page and enter again, I cannot detect the linked camera.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
[self addImageCaptureCore];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self checkCameraConnection];
});
}
- (void)checkCameraConnection {
if (@available(iOS 13.0, *)) {
NSArray<ICDevice *> *connectedDevices = self.browser.devices;
if (connectedDevices.count > 0) {
NSLog(@"Camera is connected");
} else {
NSLog(@"Camera is not connected");
}
}
else {
// Fallback on earlier versions
}
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
if (@available(iOS 13.0, *)) {
if (self.cameraDevice) {
if (self.cameraDevice.hasOpenSession) {
[self.cameraDevice requestCloseSession];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.browser stop];
self.browser.delegate = nil;
self.browser = nil;
});
}
else {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.browser stop];
self.browser.delegate = nil;
self.browser = nil;
});
}
}
} else {
// Fallback on earlier versions
}
}
- (void)addImageCaptureCore {
if (@available(iOS 13.0, *)) {
ICDeviceBrowser *browser = [[ICDeviceBrowser alloc] init];
browser.delegate = self;
[browser start];
self.browser = browser;
}
else {
}
}
#pragma mark - ICDeviceBrowserDelegate
- (void)deviceBrowser:(ICDeviceBrowser*)browser didAddDevice:(ICDevice*)device moreComing:(BOOL) moreComing API_AVAILABLE(ios(13.0)){
NSLog(@"Device name = %@",device.name);
if ([device isKindOfClass:[ICCameraDevice class]]) {
if ([device.capabilities containsObject:ICCameraDeviceCanAcceptPTPCommands]) {
ICCameraDevice *cameraDevice = (ICCameraDevice *)device;
cameraDevice.delegate = self;
[cameraDevice requestOpenSession];
self.cameraDevice = cameraDevice;
}
}
}
- (void)deviceBrowser:(ICDeviceBrowser*)browser didRemoveDevice:(ICDevice*)device moreGoing:(BOOL) moreGoing API_AVAILABLE(ios(13.0)){
if (self.cameraDevice) {
if (self.cameraDevice.hasOpenSession) {
[self.cameraDevice requestCloseSession];
self.cameraDevice.delegate = nil;
self.cameraDevice = nil;
}
else {
self.cameraDevice.delegate = nil;
self.cameraDevice = nil;
}
}
}
#pragma mark - ICCameraDeviceDelegate
- (void)cameraDevice:(ICCameraDevice*)camera didAddItems:(NSArray<ICCameraItem*>*) items API_AVAILABLE(ios(13.0)){
if (items.count > 0) {
ICCameraItem *latestItem = items.lastObject;
NSLog(@"name = %@",latestItem.name);
}
}
#pragma mark - ICDeviceDelegate
- (void)device:(ICDevice*)device didOpenSessionWithError:(NSError* _Nullable) error API_AVAILABLE(ios(13.0)){
if (error) {
NSLog(@"Failed to open session %@",error.localizedDescription);
}
else {
NSLog(@"open session success");
}
}
- (void)device:(ICDevice*)device didCloseSessionWithError:(NSError* _Nullable)error API_AVAILABLE(ios(13.0)){
if (error) {
NSLog(@"close session error = %@",error.localizedDescription);
}
else {
NSLog(@"didCloseSession");
}
}
- (void)didRemoveDevice:(ICDevice*)device {
}
Nuoyun
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I use a data cable to connect my Nikon camera to my iPhone. In my project, I use the framework ImageCaptureCore. Now I can read the photos in the camera memory card, but when I press the shutter of the camera to take a picture, the camera does not respond, the connection between the camera and the phone is normal. Then the camera screen shows a picture of a laptop. I don't know. Why is that? I hope someone can help me.