Issues aligning UIButton in UIView - ios

Question

I am trying to align a UIButton within my ViewController. I can't tell what the specific name is of my UIButton so I think that's why I'm having a hard time moving it as a subview. Here is my code:
-(void)viewDidAppear:(BOOL)animated
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
CALayer *viewLayer = self.vImagePreview.layer;
NSLog(#"viewLayer = %#", viewLayer);
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = self.vImagePreview.bounds;
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];
//Modify to fit screen
CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 0.0);
CGAffineTransform scale = CGAffineTransformMakeScale(1.333333, 1.333333);
CGAffineTransform rotate = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));
CGAffineTransform transform = CGAffineTransformConcat(translate, scale);
transform = CGAffineTransformConcat(transform, rotate);
self.vImagePreview.transform = transform;
[self.vImagePreview sendSubviewToFront:UIButton];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
// Handle the error appropriately.
NSLog(#"ERROR: trying to open camera: %#", error);
}
[session addInput:input];
_stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[_stillImageOutput setOutputSettings:outputSettings];
[session addOutput:_stillImageOutput];
[session startRunning];
}
-(IBAction)captureNow {
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in _stillImageOutput.connections)
{
for (AVCaptureInputPort *port in [connection inputPorts])
{
if ([[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
break;
}
}
if (videoConnection)
{
break;
}
}
NSLog(#"about to request a capture from: %#", _stillImageOutput);
[_stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
CFDictionaryRef exifAttachments = CMGetAttachment( imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments)
{
// Do something with the attachments.
NSLog(#"attachements: %#", exifAttachments);
} else {
NSLog(#"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
self.vImage.image = image;
//Saved Photo modifications go here
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}];
}
#end
and my headers, just in case:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>
#import <ImageIO/CGImageProperties.h>
#define DEGREES_RADIANS(angle) ((angle) / 180.0 * M_PI)
#interface ViewController : UIViewController
#property(nonatomic, retain) IBOutlet UIView *vImagePreview;
#property(nonatomic, retain) AVCaptureStillImageOutput *stillImageOutput;
#property(nonatomic, retain) IBOutlet UIImageView *vImage;
#end
Some clarification:
My button is on my storyboard. The button should trigger the CaptureNow method, taking a picture. I just can't figure out how to get it to appear over the preview layer.

Answer 1

Since your UIbutton is on storyboard, so instead of using
[self.vImagePreview sendSubviewToFront:UIButton];
use this line to display UIBUtton on top.
[self.view bringSubviewToFront:UIButton];
Just before start session running at the end of the emethod.