AVAudioRecorder is also built on top of Audio Queue Services. It provides capability to:
- Record until user stop the recording
- Record for a specified duration
- Pause and resume recording
- Audio-level metering
AVAudioPlayer makes easy to playback the audio data from local files and memory. It is built on top of Core Audio’s C-based Audio Queue Service. It provides all core functions we can find in Audio Queue Service.
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This is the note for swift knowledge refreshing.
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I will talk about NSTimer in this order.
- Initial a NSTimer
- Invalidate a NSTimer
- NSTimer and runloop
Here is how to create thumbnail for videos. Two steps:
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I got this error because I mistyped the Link to link.
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Continue after GCD Note 1.
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Before talking about strongSelf and weakSelf, I need briefly explain retain cycle.
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GCD is the short form of Grand Central Dispatch. To understand GCD, there are several concepts needed to be known.
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Learning notes for book iOS Animations by Tutorials.
Auto layout is a powerful tool to create app interface. Developers can pre-set the constraints for a view. How to change a certain constraint to create animation?
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