Question

拖动UIImageView时需要具有性能/平滑度。在使用Apple的MoveMe sample应用程序时，我变得顺畅，但是当我在我的代码中实现相同时，性能会下降。

我也在录制屏幕和音频视频。我已经在后台保留了视频和音频录制，因此我获得了更多的性能，但它仍然有点痒。

如果您注意到iTunes上的PuppetpalHD应用，则它具有非常好的平滑度。如何实现???

这是我的代码：

按钮点击：

if (Isrecording ==YES)
{
    [captureview performSelectorInBackground:@selector(startRecording) withObject:nil];
    [self performSelectorInBackground:@selector(startAudioRecording) withObject:nil];
    Isrecording =NO;
    [btnRecord setTitle:@"Stop" forState:UIControlStateNormal];
}
else if (!Isrecording)
{
    [captureview performSelector:@selector(stopRecording) withObject:nil afterDelay:1.0];
    [self performSelector:@selector(stopAudioRecording) withObject:nil afterDelay:3.0];
    Isrecording=YES;
    [btnRecord setTitle:@"Record" forState:UIControlStateNormal];
    [self performSelector:@selector(putTogether) withObject:nil afterDelay:5.0];
}

现在，如果您看到上面的代码，我的startRecording函数将记录屏幕。和startAudioRecording将录制音频。

下面的代码用于拖动UIImageView：

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    UITouch *t = [touches anyObject];
    CGPoint pPrev = [t previousLocationInView:self];
    CGPoint p = [t locationInView:self];

    CGPoint center = self.center;
    center.x += p.x - pPrev.x;
    center.y += p.y - pPrev.y;
    self.center = center;
}

If I stop recording audio or video, then dragging is very smooth. How can I achieve smooth performance along with audio and video recording.

修改

我也试过使用http://www.icodeblog.com/2010/10/14/working-with-uigesturerecognizers/中给出的UIPanGestureRecognizer，但是具有与上面相同的情况。我没有音频和视频录制得到足够的平滑度，但是当它被包含在内时性能会降低......

编辑2：

与pointInside:withEvent:相比，touchesMoved:withEvent:是否有任何性能提升？如何在使用上面的第一种方法时从下面的代码中获得性能？

UITouch *t = [touches anyObject];
CGPoint pPrev = [t previousLocationInView:self];
CGPoint p = [t locationInView:self];

CGPoint center = self.center;
center.x += p.x - pPrev.x;
center.y += p.y - pPrev.y;
self.center = center;

编辑3：

包括我的屏幕视频录制代码部分：

-(BOOL) setUpWriter {
NSError* error = nil;
videoWriter = [[AVAssetWriter alloc] initWithURL:[self tempFileURL] fileType:AVFileTypeQuickTimeMovie error:&error];
NSParameterAssert(videoWriter);

//Configure video
NSDictionary* videoCompressionProps = [NSDictionary dictionaryWithObjectsAndKeys:
                                       [NSNumber numberWithDouble:1024.0*1024.0], AVVideoAverageBitRateKey,
                                       nil ];

NSDictionary* videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               AVVideoCodecH264, AVVideoCodecKey,
                               [NSNumber numberWithInt:self.frame.size.width], AVVideoWidthKey,
                               [NSNumber numberWithInt:self.frame.size.height], AVVideoHeightKey,
                               videoCompressionProps, AVVideoCompressionPropertiesKey,
                               nil];

videoWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain];

NSParameterAssert(videoWriterInput);
videoWriterInput.expectsMediaDataInRealTime = YES;
NSDictionary* bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                  [NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];

avAdaptor = [[AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:bufferAttributes] retain];

//add input
[videoWriter addInput:videoWriterInput];
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:CMTimeMake(0, 1000)];

return YES;
}

在拖动音频/屏幕视频录制的同时实现平滑/性能

0 个答案: