AVAudioEngineManualRenderingBlock AVAudioEngineManualRenderingError AVAudioEngineManualRenderingMode AVAudioEngineManualRenderingStatus AVAudioEnvironmentDistanceAttenuationModel AVAudioEnvironmentDistanceAttenuationParameters AVAudioEnvironmentNode AVAudioEnvironmentReverbParameters AVAudioFile AVAudioFormat AVAudioInputNode ...
Sets the current playback time within a specified time bound and invokes the specified block when the seek operation completes or is interrupted. func seek(to: Date, completionHandler: ((Bool) -> Void)?) -> Bool Sets the current playback time to the time specified by the date object. fun...
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#onis really just a shortcut. Often we don't want to attach a whole observer to an observable object. We just want to trigger a particular block of code to be run when a specific event is detected. So#onmakes it easy to hook up a block of code to a single event. ...
ALAssetsLibrary*library=[[ALAssetsLibrary alloc]init];[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup*group,BOOL*stop){// Within the group enumeration block, filter to enumerate just videos.[group setAssetsFilter:[ALAssetsFilter allVideos]];if(group.numberOf...
Pollination is important for both agriculture and biodiversity. For a significant number of plants, this process is highly and sometimes exclusively, dependent on the pollination activity of honeybees. The large numbers of honeybee colony losses reported in recent years have been attributed to colony ...
AVFoundation会调用块block一次,以便从资产的第一个启用的视频轨道显示(或处理导出)每个帧。在该块block中,使用提供的AVAsynchronousCIImageFilteringRequest对象访问视频帧并返回过滤结果。使用该对象的sourceImage属性以可以应用过滤器的CIImage对象的形式获取视频帧。将过滤器的结果传递给请求对象的-finishWithImage:context...
For the fluorescent stainings, slices were first rinsed (3 × 10 min in PBS) and then incubated in 10% NHS (Vector Laboratories-Vectastain Elite ABC kit) to block unspecific binding sites. After blocking and rinsing (3 × 10 min), the slices for the single ChR2 stainings ...
Similarly, the sample code dispatches other tasks—such as resuming an interrupted session, toggling capture modes, switching cameras, and writing media to a file—to the session queue, so that their processing doesn’t block or delay user interaction with the app. In contrast, the code ...
__block BOOL support = NO; [self.captureDevice.activeFormat.videoSupportedFrameRateRanges enumerateObjectsUsingBlock:^(AVFrameRateRange * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { if (CMTimeCompare(frameDuration, obj.minFrameDuration) >= 0 && ...