I am building a coreML app that identifies flower type.
When I implemented the UIImagePicker and using it through my phone it allows me to open the camera and takes the photo but when I click to use this photo it just gives me a black screen.
I have attached my code.
Possible cases:
UIImagePickerController is not in the main thread.
DispatchQueue.main.async {
#put your code here
imagePicker.delegate = self
imagePicker.sourceType = .camera
....
}
Set privacy setting for the camera to info.plist for accessing camera:
<key>NSCameraUsageDescription</key>
<string>This app wants to take pictures.</string>
Related
I made an image editing app for iPhone, and it got rejected because the app is not able to run on ipad at iphone resolution. It failed in both 1x and 2x resolution.
When I click choose photo, I present the camera picker to select a pic, but camera picker is not showing any images in the simulator.(I didnt test this in real device, I beleive apple will test this in real device) It works normally in iPhone, and also in iPad if I make the app Universal.
But If I make the app compatible for iPhone, then it should also run in iPad at iPhone resolution, which is not happening in my case!!!
Here are the screenshots of ipad pro simulator:
After I choose the pic, it should display in the imageview, but I get the blank imageview without image.
I dont have anything fancy in code. It is a routine camera picker:
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:NULL];
I did try to put a breakpoint while picker is presented and after the image is selected. The picker and the selected image is not nil, but when I preview the selected image on xcode, it shows a blank image:
Surprisingly, when I run the app in iphone simulator xcode showed the image:
NOTE:
When run the app on iphone simulator for the first time, camera picker asked permission to access the photos.But When I run it on iPad at iPhone resolution, picker didnt asked for any permission!!!!
With OSX 10.10 beta 3, Apple released their dark tint option. Unfortunately, it also means that pretty much all status bar icons (with the exception of Apple's and Path Finder's that I've seen), including mine, remain dark on a dark background. How can I provide an alternate image for when dark tint is applied?
I don't see an API change on NSStatusBar or NSStatusItem that shows me a change, I'm assuming it's a notification or something reactive to easily make the change as the user alters the tint.
Current code to draw the image is encased within an NSView:
- (void)drawRect:(NSRect)dirtyRect
{
// set view background color
if (self.isActive) {
[[NSColor selectedMenuItemColor] setFill];
} else {
[[NSColor clearColor] setFill];
}
NSRectFill(dirtyRect);
// set image
NSImage *image = (self.isActive ? self.alternateImage : self.image);
_imageView.image = image;
}
TL;DR: You don't have to do anything special in Dark Theme. Give NSStatusItem (or NSStatusBarButton) a template image and it will style it correctly in any menubar context.
The reason why some apps' status items (such as PathFinder's) already work in Dark Theme is because they're not setting their own custom view on the StatusItem, but only setting a template image on the StatusItem.
Something like:
_statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength];
NSImage *image = [NSImage imageNamed:#"statusItemIcon"];
[image setTemplate:YES];
[_statusItem setImage:image];
This works exactly as you'd expect in Mavericks and earlier, as well as Yosemite and any future releases because it allows AppKit to do all of the styling of the image depending on the status item state.
Mavericks
In Mavericks (and earlier) there were only 2 unique styles of the items. Unpressed and Pressed. These two styles pretty much looked purely black and purely white, respectively. (Actually "purely black" isn't entirely correct -- there was a small effect that made them look slightly inset).
Because there were only two possible state, status bar apps could set their own view and easily get the same appearance by just drawing black or white depending on their highlighted state. (But again note that it wasn't purely black, so apps either had to build the effect in the image or be satisfied with a hardly-noticeable out of place icon).
Yosemite
In Yosemite there are at least 32 unique styling of items. Unpressed in Dark Theme is only one of those. There is no practical (or unpractical) way for an app to be able to do their own styling of items and have it look correct in all contexts.
Here are examples of six of those possible stylings:
Status items on an inactive menubar now have a specific styling, as opposed to a simple opacity change as in the past. Disabled appearance is one other possible variation; there are also other additional dimensions to this matrix of possibilities.
API
Arbitrary views set as NSStatusItem's view property have no way to capture all of these variations, hence it (and other related API) is deprecated in 10.10.
However, seed 3 introduces new API on NSStatusItem:
#property (readonly, strong) NSStatusBarButton *button NS_AVAILABLE_MAC(10_10);
This piece of API has a few purposes:
An app can now get the screen position (or show a popover from) a status item without setting its own custom view.
Removes the need for API like image, title, sendActionOn: on NSStatusItem.
Provides a class for new API: i.e. looksDisabled. This allows apps to get the standard disabled/off styling (like Bluetooth/Time Machine when off) without requiring a custom image.
If there's something that can't be done with the current (non- custom view) API, please file an enhancement request for it. StatusItems should provide behavior or appearances in a way that it standard across all status items.
More discussion is at https://devforums.apple.com/thread/234839, although I've summarized most everything here.
I end up did something like following to my custom drag and drop NSStatusItemView: (Using Swift)
var isDark = false
func isDarkMode() {
isDark = NSAppearance.currentAppearance().name.hasPrefix("NSAppearanceNameVibrantDark")
}
override func drawRect(dirtyRect: NSRect) {
super.drawRect(dirtyRect)
isDarkMode()
// Now use "isDark" to determine the drawing colour.
if isDark {
// ...
} else {
// ...
}
}
When the user changed the Theme in System Preferences, the NSView will be called by the system for re-drawing, you can change the icon colour accordingly.
If you wish to adjust other custom UI outside this view, you can either use KVO to observer the isDark key of the view or do it on your own.
I created a basic wrapper around NSStatusItem that you can use to provide support for 10.10 and earlier with custom views in the status bar. You can find it here: https://github.com/noahsmartin/YosemiteMenuBar The basic idea is to draw the custom view into a NSImage and use this image as a template image for the status bar item. This wrapper also forwards click events to the custom view so they can be handled the same way as pre 10.10. The project contains a basic example of how YosemiteMenuBar can be used with a custom view on the status bar.
Newest swift code set image template method is here:
// Insert code here to initialize your application
if let button = statusItem.button {
button.image = NSImage(named: "StatusIcon")
button.image?.isTemplate = true // Just add this line
button.action = #selector(togglePopover(_:))
}
Then it will change the image when dark mode.
When your application has drawn any GUI element you can get its appearance via [NSAppearance currentAppearance] which itself has a name property that holds something like
NSAppearanceNameVibrantDark->NSAppearanceNameAqua->NSAppearanceNameAquaMavericks
The first part is the appearance’s name, which is also available as a constant in NSAppearanceNameVibrantDark or NSAppearanceNameVibrantLight.
I don’t know if there’s a way to get just the first part, but I think this does the trick for now.
Example code:
-(void)awakeFromNib {
NSStatusItem* myStatusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength];
myStatusItem.title = #"Hello World";
if ([[[NSAppearance currentAppearance] name] containsString:NSAppearanceNameVibrantDark]) {
myStatusItem.title = #"Dark Interface";
} else {
myStatusItem.title = #"Light Interface";
}
}
But just in case you do want to monitor the status changes you can. I also know there is a better way to determine lite/dark mode than what's been said above, but I can remember it right now.
// Monitor menu/dock theme changes...
[[NSDistributedNotificationCenter defaultCenter] addObserver: self selector: #selector(themeChange:) name:#"AppleInterfaceThemeChangedNotification" object: NULL];
//
-(void) themeChange :(NSNotification *) notification
{
NSLog (#"%#", notification);
}
I am developing an app which allows you to select photos and place them into different positions. The workflow is basically:
Tap an area of the screen
UIImagePickerController displays
Select a photo
Photo displays in the tapped area of the screen
I would like it so that if the user goes through this workflow for a second time, the UIImagePickerController when displayed will be showing the same album, and position within that album, that the user was last at.
I've tried saving a reference to the UIImagePickerController, as well as the UIPopoverController, so that they are created only once. However, every time I present the popover containing the UIImagePickerController, it is back at the main photos menu (eg. Camera Roll, Photo Library, My Photo Stream).
Any ideas for how to achieve what I'm after?
You can use ALAssetsLibrary . But this will cost you more effort. First time use – enumerateGroupsWithTypes:usingBlock:failureBlock: to list all album and remember user's choice. And at second time. Just use that album:ALAssetsGroup's – enumerateAssetsUsingBlock: to list all the images and videos. Apple has a few demo you can have a look PhotosByLocation MyImagePicker
keep a UIImagePickerController obj in .h class (for example imagePicker)
alloc the obj once (for example in viewDidLoad)
imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self.view addSubview:imagePicker.view];
imagePicker.view.hidden = YES;
imagePicker.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
imagePicker.view.bounds = CGRectMake(0,20,self.view.frame.size.width, self.view.frame.size.height);
In didFinishPickingMediaWithInfo
if([[info valueForKey:UIImagePickerControllerMediaType] isEqualToString:#"public.image"]){
imagePicker.view.hidden = YES;
}
When you want to show the imagePickerView just do
imagePicker.view.hidden = NO;
Just to point you to right direction. You can use asset library to show the images as a picker. You can use the apple sample code MyImagePicker. The method [[assetsLibrary] enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup *group, BOOL *stop) can be used for photo album. Using the asset library you can check which image was selected last and then use the method,
- (void)enumerateAssetsAtIndexes:(NSIndexSet *)indexSet options:(NSEnumerationOptions)options usingBlock:(ALAssetsGroupEnumerationResultsBlock)enumerationBlock;
You can use this method next time to enumerate which image onwards you want to enumerate. This method can accept an indexSet as [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(index, count)] which should help to indicate the last selected image.
To know more about how to use asset library check this.
It should be possible to reach into the resulting UITableView and then find its content offset. You can do this by searching the subviews of the UIImagePickerController's view property for a table view.
for (UIView *view in controller.view) {
if ([view isKindOfClass:[UITableView class]]) {
contentOffset = [(UITableView *)view contentOffset];
}
}
When you represent the view controller, you will want to restore the content offset in a similar fashion.
Note, I haven't actually tested to see the view hierarchy of the UIImagePickerController. Verify its structure by printing its subviews. There is also no guarantee that the structure will stay the same, since you are diving into the private implementation (though it's important to note you are not actually using any private APIs so this is okay).
Use AlAssetsLibrary. It control the image & video capture under the application. there a demo on apple.
https://developer.apple.com/library/ios/#documentation/AssetsLibrary/Reference/ALAssetsLibrary_Class/Reference/Reference.html
look for this or
if you want to make a cutomize album for the image and video here a great example.
https://github.com/Kjuly/ALAssetsLibrary-CustomPhotoAlbum
Scenario
An app that captures an image from Front camera automatically after 3 sec countdown.
Everything is working as expected.
Code
//in viewDidLoad
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
imagePicker = [[UIImagePickerController alloc] init];
self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
self.imagePicker.delegate = self;
self.imagePicker.showsCameraControls = NO;
[self.imagePicker.view setFrame:kAppFrame];
[self.view addSubview:self.imagePicker.view];
[self.view bringSubviewToFront:self.imagePicker.view];
}
Problem
I have never told the ipad to use its rear device Still in certain cases the rear camera starts.
Steps to reproduce
Hold the camera in Landscape orientation
Click a photo (Will take you to next screen, pushed in Nav controller)
In the next screen tilt the ipad halfway towards face up orientation
Comeback to camera screen and you see it using rear camera.
This is a very strange behavior I am not even able to understand its cause.
check your code the line self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront; define that you open your front vamera of device.
Now your second problem: i am not sure but you have to rotate your image 90 degree. It's may be when you get image it's get in portrait mode.
It looks like I have found the solution.
just moving the entire code to viewWillAppear from viewDidLoad method.
It looked like I was relying a lot on view before it appeared with a certain orientation. Putting the code in viewWillAppear guaranteed me that the view is actually ready with its orientation set. I can now put anything on it.
I know this is not the proper answer but this is what I made out of the scenario. Any modifications/correction are most welcome.
How can I let the user see the front facing camera, but prevent them from being able to take a picture, video, or switch to the rear camera on the iPhone 4/4s and/or the iPod Touch 4?
cameraPicker = [[UIImagePickerController alloc] init];
....
cameraPicker.showsCameraControls = NO;
cameraPicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
You can use AVFoundation framework to open camera.
Try this sample code https://developer.apple.com/library/ios/#samplecode/AVCam/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010112 .