几年前我收到了一个应用程序，要求从新客户端更新，并提供了原始代码。
在进行更新后，他们希望让应用再次运行，我们发现有一个错误，如果用户旋转设备拍摄风景照片，屏幕上的视图不会旋转并将照片拍摄为90度，而不是真正的横向。
这本来是一个快速的工作，已经变得非常头痛。
我有什么想法可以对下面的代码做些什么来解决这个问题？
非常感谢！
//
// CameraViewController.m
//
//
// Created by XXX on 8/9/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "CameraViewController.h"
#import <ImageIO/ImageIO.h>
@implementation CameraViewController
@synthesize stillImageOutput, delegate;
@synthesize session, captureVideoPreviewLayer;
- (void)dealloc {
[stillImageOutput release];
[captureVideoPreviewLayer release];
[session release];
[super dealloc];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
-(void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
self.captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = cameraView.bounds;
[cameraView.layer addSublayer:captureVideoPreviewLayer];
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];
canDismiss = 0;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification object:nil];
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void) didRotate:(NSNotification *)notification {
[UIView beginAnimations:nil context:nil];
if ( UIInterfaceOrientationIsLandscape([[UIDevice currentDevice] orientation]) ) {
[topView setFrame:CGRectMake(0, 0, 320, 27)];
[bottomView setFrame:CGRectMake(0, 433, 320, 27)];
} else {
[topView setFrame:CGRectMake(0, 0, 320, 110)];
[bottomView setFrame:CGRectMake(0, 350, 320, 110)];
}
switch ([[UIDevice currentDevice] orientation]) {
case UIInterfaceOrientationPortrait:
btnDone.transform = CGAffineTransformIdentity;
btnTakePicture.transform = CGAffineTransformIdentity;
break;
case UIInterfaceOrientationPortraitUpsideDown:
btnDone.transform = CGAffineTransformMakeRotation(M_PI);
btnTakePicture.transform = CGAffineTransformMakeRotation(M_PI);
break;
case UIInterfaceOrientationLandscapeLeft:
btnDone.transform = CGAffineTransformMakeRotation(3*M_PI_2);
btnTakePicture.transform = CGAffineTransformMakeRotation(3*M_PI_2);
break;
default:
btnDone.transform = CGAffineTransformMakeRotation(M_PI_2);
btnTakePicture.transform = CGAffineTransformMakeRotation(M_PI_2);
break;
}
[UIView commitAnimations];
}
-(IBAction)takePhoto {
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);
canDismiss++;
[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");
int width = [[[NSUserDefaults standardUserDefaults] objectForKey:@"image_width"] intValue];
int height = [[[NSUserDefaults standardUserDefaults] objectForKey:@"image_height"] intValue];
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage * image = [[UIImage alloc] initWithData:imageData];
NSLog(@"Image w:%f h:%f", image.size.width, image.size.height);
UIImage * rotatedimage;
if ( UIInterfaceOrientationIsLandscape([[UIDevice currentDevice] orientation]) ) {
// Rotate the image
CGSize newSize = CGSizeMake(image.size.height, image.size.width);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate (NULL, newSize.width, newSize.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colorSpace);
if ( [[UIDevice currentDevice] orientation] == UIInterfaceOrientationLandscapeLeft ) {
CGAffineTransform transform = CGAffineTransformMakeTranslation(0.0, newSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGContextScaleCTM(ctx, -1.0, 1.0);
CGContextTranslateCTM(ctx, -newSize.width, 0);
CGContextConcatCTM(ctx, transform);
}
CGContextDrawImage(ctx, CGRectMake(0, 0, newSize.width, newSize.height), image.CGImage);
CGImageRef sourceImageRef = CGBitmapContextCreateImage(ctx);
rotatedimage = [UIImage imageWithCGImage:sourceImageRef];
CGContextRelease(ctx);
NSLog(@"Rotated Image w:%f h:%f", rotatedimage.size.width, rotatedimage.size.height);
// Scale the image
newSize = CGSizeMake(width, height);
UIGraphicsBeginImageContext(newSize);
[rotatedimage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
//image is the original UIImage
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSLog(@"New Image w:%f h:%f", newImage.size.width, newImage.size.height);
[delegate tookPhoto:newImage];
} else {
// Scale the image
CGSize newSize = CGSizeMake(width, image.size.height/(image.size.width/width));
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSLog(@"New Image w:%f h:%f", newImage.size.width, newImage.size.height);
// Chop out the middle
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate (NULL, width, height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colorSpace);
if ( [[UIDevice currentDevice] orientation] == UIInterfaceOrientationPortraitUpsideDown ) {
CGAffineTransform transform = CGAffineTransformMakeTranslation(0.0, newImage.size.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGContextScaleCTM(ctx, -1.0, 1.0);
CGContextTranslateCTM(ctx, -newImage.size.width, 0);
CGContextConcatCTM(ctx, transform);
CGContextDrawImage(ctx, CGRectMake(0, (newImage.size.height-height)/2, newImage.size.width, newImage.size.height), newImage.CGImage);
} else {
CGContextDrawImage(ctx, CGRectMake(0, -(newImage.size.height-height)/2, newImage.size.width, newImage.size.height), newImage.CGImage);
}
CGImageRef sourceImageRef = CGBitmapContextCreateImage(ctx);
CGContextRelease(ctx);
[delegate tookPhoto:[UIImage imageWithCGImage:sourceImageRef]];
}
[image release];
canDismiss--;
}];
}
-(IBAction)done {
if ( canDismiss == 0 ) {
self.delegate = nil;
//[self dismissModalViewControllerAnimated:YES];
[self dismissViewControllerAnimated:YES completion:nil];
}
}
@end
答案 0 :(得分：0)
如果我没有误会你必须放置这段代码： 试试这个：
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
if([landscapeAllowedID contains: currentViewID])
return (interfaceOrientation == UIInterfaceOrientationPortrait) | (interfaceOrientation == UIInterfaceOrientationLandscape);
}
修改
还要将它添加到UIViewController。
-(NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape; // etc
}
如果不起作用，请将代码放在自定义UINavigationController中。您必须使用UINavigationController让它知道当前查看的视图。
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
if([landscapeAllowedID contains: currentViewID])
return (interfaceOrientation == UIInterfaceOrientationPortrait) | (interfaceOrientation == UIInterfaceOrientationLandscape);
}