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Preface After playing music by oneself, one can operate the lock screen and play back-stage, mainly using AVAudioSession class. This class is a singleton class that sets some context of APP about Audio and passes some of its behavior to the system. An audio session is a singleton object that you employ to set the audio context for your ap ...

List: ion-list Listing is a common way of organizing information. In ionic, list elements are declared using ion-list instructions, and member elements are declared using ion-item instructions: <ion-list>       <ion-item>...</ion-item>       <ion-item>...</ion-item>       ...    </io ...

Classes ofstream, ifstream and fstream are three classes of file operations, derived from ostream, istream and iostream, respectively. Usually ifstream and OFSTREAM are used to read and write files respectively. 1. Open the file void open (const char * filename, openmode mode); filename is a string representing the name of the file to b ...

2019-06-01 Topic: Luogu P3377 [Template] Left-sided Tree (Parallel Heap): https://www.luogu.org/problemnew/show/P3377 Title Description For example, there are N small root heaps at the beginning. Each heap contains only one number. Next, two operations need to be supported: Operation 1:1 x y merges the small root heap where the number x ...

Dig a Bessel Curve and those things I. Past and present life Bessel Curve was originally designed to serve industrial design, especially for applications and automotive curve design. With the wide application of computer drawing, it is not easy to draw smooth and accurate curves on the computer. Bessel curve solves such a problem. Bessel das ...

Overview of TakeVideo The iOS system itself has a UI Image Picker Controller for taking photos and videos, but now major applications like to customize the interface for taking videos, and you must be heartened. Take Wechat for example, the mini-video is 9 seconds long and takes up 1.5 MB. So we want to do the same effect. What should we do? ...

Simple Analysis of Internal Calls in SDWebImage 4 Framework UML Diagram and Call Sequence Diagram Second, we started by setting up a network picture for UIImageView. 3sd_setImageWithURL Four downloadImageWithURL Five downloadImageWithURL Six init WithRequest SDWebImage 4 - Simple analysis of internal calls within the framework The ...

Summary of knowledge points: C++ I/O: Definition in iostream header file istream // Universal Input Stream and other Input Stream Base Classes. ostream // Universal Output Stream and other stream-based classes. iostream//Universal I/O Stream and other I/O Stream Base Classes. Definition in fstream header ...

iOS recording uses AVAudio Recorder, playing with AVPlayer can be a good solution, there are many online tutorials. I won't go into details here, but I'll attach the code later. First of all, demo content, now the project requires a recording, uploading, playback function. Details: Before recording, prompt tone is needed. When recording, there ...

1. Introduction to CAShape Layer CAShapeLayer is a subclass of layers drawn by vector graphics rather than bitmap. CAShapeLayer inherits from CALayer and can use all attribute values of CALayer. CAShapeLayer needs to be used in conjunction with the Bessel curve to make sense (this is personal experience). Using CAShapeLayer and Bessel curve ...