How can I just display a live feed of the rear camera in Objective-C? What do I need to add to my storyboard and what do I need to add to my ViewController? Any examples would be great.
You would need to use AVFoundation, specifically look at AVCaptureSession, AVCaptureDeviceInput, which you can use in order to get access to the cameras and look into AVCaptureVideoPreviewLayer which will allow you to draw the camera input to the screen
EDIT :
There's a step by step tutorial in Obj-C about it :
https://www.appcoda.com/ios-programming-camera-iphone-app/
Related
i need to achieve an animation effect like (the Effects in "Pic Something","Pic Reveal" and so on) in my app.
What i am saying is i need to implement this tasks
Task1: when the user touches one Letter, then it change its frame(current position) to another frame(target position).
Task2:when the user touch the Letter(in Target position), it comes back to its original position again.
this can be clearly understood if u see the sample Apps.
I didn't find out any samples on internet also.
Thanks in Advance..
Take a look at UIView animation and animation blocks in iOS, that's what you need. With them you can create any animation you like. Here's a nice tutorial.
And about the whole system you described - I would create an NSDictionary of UIView positions and attach those to the corresponding tags of UIViews- this way you will always know from which place every UIView came from.
I'm wondering if it's possible to have a slide with text AND add some animation into it for an iPad app. See screenshot below to get an idea of what I need. I want that guy jump up and down and smile. I'm sure I'm not capable of drawing that image using Objective-C primitives myself, so I'm looking at the following options:
Do complete animation in 3rd-party tool (Adobe?) and then add it as single standalone file on the slide. But I do not know, what formats are supported in iOS, what are standard formats, and, at the end, how to insert that file on the slide. Can somebody clarify this please?
Do complete animation, and then save frames as images, and then quickly change images to give illusion of a movie.
Am I missing something? Are there any other ways? what's the best option?
Please let me know if I'm not clear enough - I will try to provide more information.
Thank you.
If you want to use a movie file for the animation, you can find the supported video formats in the iOS Technology Overview, under “Media Layer > Video Technologies”. You will need to use an AVPlayerLayer from the AVFoundation Framework to show the video.
If you want to use a separate image file for each frame, you can use one of the +[UIImage animatedImage...] methods to create an animated UIImage, and display it in a UIImageView.
If you want to use a single animated GIF for the animation, you can use this public domain UIImage+animatedGIF category to load the GIF into an animated UIImage, and display it in a UIImageView.
I'm trying to capture one or more UIImages programmatically using AVFoundation.
I set up the sessions and input devices and everything, but when I try to find explanations on how to actually take the photos, all I get is buffeled information about connections and what not.
I couldn't find a single example of actually taking photos and saving it to UIImage for further processing. All the example use a constant kCGImagePropertyExifDictionary Which doesn't seems to exist in iOS 5 SDK..
Can someone please provide me with a code or an explanation from top to bottom on how to take and save an image from the front facing camera to a UIImage using AVFoundation?
Thanks alot!
To use kCGImagePropertyExifDictionary, you should #import <ImageIO/ImageIO.h>.
All of the other information you seek is inside the AVFoundation Programming guide - particularly the Media Capture section.
Is it possible to have a curve UISlider or is it just Horizontal and Vertical?
I've tried replacing the slider track with a curve image (though i already know hat it will not work because it is just a background), not working.
Is there a way that i could do that?
Take a look at custom controls (both of them are under MIT license):
MHRotaryKnob
Cocoacontrols
Github
DCKnob
Cocoacontrols
Github
I wrote this sample app to show how to use a Curve UIBezierPath and move an object through it
you can take a look at :
Curvy UISlider
I will try to update it.
No you can't do this with the UISlider, only in a straight line. You can rotate the whole slider to a degree you like with the transform property and use a function like CGAffineTransformMakeRotation. An example: How to use CGAffineTransformMakeRotation?.
You can also check out BezierSlider which allows you to customize the path and the selector.
I would like to start front camera of the iPad when app starts.
How do I do it programmatically?
Please let me know.
First thing you need to do is to detect if your device has got front-facing camera. For that you need to iterate through the video devices.
Try this method of UIImagePickerController:
+ (BOOL)isCameraDeviceAvailable:(UIImagePickerControllerCameraDevice)cameraDevice
This is a class method and UIImagePickerControllerCameraDevice can take two values:
- UIImagePickerControllerCameraDeviceRear
- UIImagePickerControllerCameraDeviceFront
Example code:
if( [UIImagePickerController isCameraDeviceAvailable: UIImagePickerControllerCameraDeviceFront ])
{
// do something
}
Note that this is available for iOS 4.0 and later.
Also I am not sure if there is any API's to start the front-facing camera up front. The camera always seems to start in the same mode that the user left it the last time it was used. Maybe by design Apple did not expose any API's to change this. Maybe Apple wanted the users to make a call on this.
Nevertheless you can atleast detect the availability of Fron Camera & provide your feature.
If I understand your question correctly, all you have to do is open your Camera to be in Front Mode instead of Rear Mode, so write this inside the method where you call the picker for the first time:
picker.cameraDevice=UIImagePickerControllerCameraDeviceFront;
Hope this answers your question.