Ios 更改相机和设备方向
我有一个应用程序，它基本上是一个视图，当用户单击一个按钮时，相机可视化就开始了 我想在相机不显示时允许所有方向，但当相机显示时，我需要强制应用程序进入纵向模式，因为如果它不在纵向上，视频会旋转。当相机关闭时，应用程序可能会再次旋转 你知道我能否解决视频定向的问题吗 或者我如何强制应用程序进入肖像模式？我知道，在早期的ios版本中，您可以使用Ios 更改相机和设备方向,ios,objective-c,ios6,rotation,Ios,Objective C,Ios6,Rotation,我有一个应用程序，它基本上是一个视图，当用户单击一个按钮时，相机可视化就开始了 我想在相机不显示时允许所有方向，但当相机显示时，我需要强制应用程序进入纵向模式，因为如果它不在纵向上，视频会旋转。当相机关闭时，应用程序可能会再次旋转 你知道我能否解决视频定向的问题吗 或者我如何强制应用程序进入肖像模式？我知道，在早期的ios版本中，您可以使用[UIDevice setOrientation:，但对于最新的ios，不推荐使用它 ios 5和ios 6如何实现这一点 我试过： [self presen
[UIDevice setOrientation:[self presentViewController:[UIViewController new] animated:NO
completion:^{ [self dismissViewControllerAnimated:NO completion:nil]; }];
if (state == CAMERA) {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}else{
return YES;
}
- 应用程序正在运行
- 如果我尝试旋转应用程序，则会旋转设备，但不会旋转应用程序。我可以看到ipad的状态栏上有时间、电池等信息，但应用程序没有旋转
- 如果我再次转到“纵向”，然后旋转设备，它工作正常
提前谢谢。请尝试以下介绍代码，以便我认为您的问题可能会得到解决
- (void)encodeVideoOrientation:(NSURL *)anOutputFileURL
{
CGAffineTransform rotationTransform;
CGAffineTransform rotateTranslate;
CGSize renderSize;
switch (self.recordingOrientation)
{
// set these 3 values based on orientation
}
AVURLAsset * videoAsset = [[AVURLAsset alloc]initWithURL:anOutputFileURL options:nil];
AVAssetTrack *sourceVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVAssetTrack *sourceAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
AVMutableComposition* composition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:sourceVideoTrack
atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:sourceVideoTrack.preferredTransform];
AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:sourceAudioTrack
atTime:kCMTimeZero error:nil];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack];
[layerInstruction setTransform:rotateTranslate atTime:kCMTimeZero];
AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
videoComposition.frameDuration = CMTimeMake(1,30);
videoComposition.renderScale = 1.0;
videoComposition.renderSize = renderSize;
instruction.layerInstructions = [NSArray arrayWithObject: layerInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
videoComposition.instructions = [NSArray arrayWithObject: instruction];
AVAssetExportSession * assetExport = [[AVAssetExportSession alloc] initWithAsset:composition
presetName:AVAssetExportPresetMediumQuality];
NSString* videoName = @"export.mov";
NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName];
NSURL * exportUrl = [NSURL fileURLWithPath:exportPath];
if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath])
{
[[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
}
assetExport.outputFileType = AVFileTypeMPEG4;
assetExport.outputURL = exportUrl;
assetExport.shouldOptimizeForNetworkUse = YES;
assetExport.videoComposition = videoComposition;
[assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
switch (assetExport.status)
{
case AVAssetExportSessionStatusCompleted:
// export complete
NSLog(@"Export Complete");
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"Export Failed");
NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]);
// export error (see exportSession.error)
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export Failed");
NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]);
// export cancelled
break;
}
}];
}
希望这对你有帮助 请尝试以下定向代码，这样我认为您的问题可能会得到解决
- (void)encodeVideoOrientation:(NSURL *)anOutputFileURL
{
CGAffineTransform rotationTransform;
CGAffineTransform rotateTranslate;
CGSize renderSize;
switch (self.recordingOrientation)
{
// set these 3 values based on orientation
}
AVURLAsset * videoAsset = [[AVURLAsset alloc]initWithURL:anOutputFileURL options:nil];
AVAssetTrack *sourceVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVAssetTrack *sourceAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
AVMutableComposition* composition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:sourceVideoTrack
atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:sourceVideoTrack.preferredTransform];
AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:sourceAudioTrack
atTime:kCMTimeZero error:nil];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack];
[layerInstruction setTransform:rotateTranslate atTime:kCMTimeZero];
AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
videoComposition.frameDuration = CMTimeMake(1,30);
videoComposition.renderScale = 1.0;
videoComposition.renderSize = renderSize;
instruction.layerInstructions = [NSArray arrayWithObject: layerInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
videoComposition.instructions = [NSArray arrayWithObject: instruction];
AVAssetExportSession * assetExport = [[AVAssetExportSession alloc] initWithAsset:composition
presetName:AVAssetExportPresetMediumQuality];
NSString* videoName = @"export.mov";
NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName];
NSURL * exportUrl = [NSURL fileURLWithPath:exportPath];
if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath])
{
[[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
}
assetExport.outputFileType = AVFileTypeMPEG4;
assetExport.outputURL = exportUrl;
assetExport.shouldOptimizeForNetworkUse = YES;
assetExport.videoComposition = videoComposition;
[assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
switch (assetExport.status)
{
case AVAssetExportSessionStatusCompleted:
// export complete
NSLog(@"Export Complete");
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"Export Failed");
NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]);
// export error (see exportSession.error)
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export Failed");
NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]);
// export cancelled
break;
}
}];
}
希望这对你有帮助 我想我已经找到了一个同时改变相机和设备方向的解决方案 我在初始化相机时调用此代码，也在shouldAutorotateToInterfaceOrientation方法中调用此代码，其中我允许所有方向
AVCaptureVideoOrientation newOrientation;
UIInterfaceOrientation deviceOrientation = [UIApplication sharedApplication].statusBarOrientation;
NSLog(@"deviceOrientation %c",deviceOrientation);
switch (deviceOrientation)
{
case UIInterfaceOrientationPortrait:
NSLog(@"UIInterfaceOrientationPortrait");
newOrientation = AVCaptureVideoOrientationPortrait;
break;
case UIInterfaceOrientationLandscapeRight:
NSLog(@"UIInterfaceOrientationLandscapeRight");
newOrientation = AVCaptureVideoOrientationLandscapeRight;
break;
case UIInterfaceOrientationLandscapeLeft:
NSLog(@"UIInterfaceOrientationLandscapeLeft");
newOrientation = AVCaptureVideoOrientationLandscapeLeft;
break;
default:
NSLog(@"default");
newOrientation = AVCaptureVideoOrientationPortrait;
break;
}
if ([self.prevLayer respondsToSelector:@selector(connection)]){
if ([self.prevLayer.connection isVideoOrientationSupported]){
self.prevLayer.connection.videoOrientation = newOrientation;
}else{
NSLog(@"NO respond to selector connection");
}
}else{
if ([self.prevLayer isOrientationSupported]){
self.prevLayer.orientation = newOrientation;
}else{
NSLog(@"NO isOrientationSupported");
}
}
我想我已经找到了一个同时改变相机和设备方向的解决方案 我在初始化相机时调用此代码，也在shouldAutorotateToInterfaceOrientation方法中调用此代码，其中我允许所有方向
AVCaptureVideoOrientation newOrientation;
UIInterfaceOrientation deviceOrientation = [UIApplication sharedApplication].statusBarOrientation;
NSLog(@"deviceOrientation %c",deviceOrientation);
switch (deviceOrientation)
{
case UIInterfaceOrientationPortrait:
NSLog(@"UIInterfaceOrientationPortrait");
newOrientation = AVCaptureVideoOrientationPortrait;
break;
case UIInterfaceOrientationLandscapeRight:
NSLog(@"UIInterfaceOrientationLandscapeRight");
newOrientation = AVCaptureVideoOrientationLandscapeRight;
break;
case UIInterfaceOrientationLandscapeLeft:
NSLog(@"UIInterfaceOrientationLandscapeLeft");
newOrientation = AVCaptureVideoOrientationLandscapeLeft;
break;
default:
NSLog(@"default");
newOrientation = AVCaptureVideoOrientationPortrait;
break;
}
if ([self.prevLayer respondsToSelector:@selector(connection)]){
if ([self.prevLayer.connection isVideoOrientationSupported]){
self.prevLayer.connection.videoOrientation = newOrientation;
}else{
NSLog(@"NO respond to selector connection");
}
}else{
if ([self.prevLayer isOrientationSupported]){
self.prevLayer.orientation = newOrientation;
}else{
NSLog(@"NO isOrientationSupported");
}
}
非常感谢你的快速回答。对不起，我对ios编程完全是个新手，我不明白如何使用你的代码。我必须把它放在哪里？它有什么作用？再次感谢。非常感谢你的快速回答。对不起，我对ios编程完全是个新手，我不明白如何使用你的代码。我必须把它放在哪里？它有什么作用？再次感谢。