damonvvong/devnotes

个人开发笔记。

Hi there 👋

My name is Damonwong, an iOS software engineer at Alibaba Group.

• 🔭 I’m currently working on Taobao for iOS, and a side project called iOS-Weekly
• 🌱 I’m currently learning Swift and SwiftUI
• 👯 I’m looking to software engineer on join us working for Alibaba Group
• 🤔 I’m looking for help with contributors for iOS-Weekly
• 💬 Ask me about iOS development
• 📫 How to reach me: weibo@damonwong
• 😄 Pronouns: He
• ⚡ Fun fact: There is nothing more fun than coding (#^.^#)

devnotes's Issues

你的demo如果录制视频点击几次屏幕后会崩溃，reason: '*** -[AVAssetWriter finishWritingWithCompletionHandler:] Cannot call method when status is 2'

• (void)stopWritingWithError:(NSError **)error {

self.isWriting = NO;

dispatch_async(self.dispatchQueue, ^{

[self.assetWriter finishWritingWithCompletionHandler:^{
	
	if (self.assetWriter.status == AVAssetWriterStatusCompleted) {
		
		dispatch_async(dispatch_get_main_queue(), ^{
			if ([self.delegate respondsToSelector:@selector(videoWriter:didOutputVideoAtPath:)]) {
				[self.delegate videoWriter:self didOutputVideoAtPath:self.assetWriter.outputURL];
			}
		});
		
	} else {
		
		*error = self.assetWriter.error;
		
	}
    self.assetWriter = nil;
}];

});
}

这个怎么解决呢?麻烦回复下,谢谢!!

请问，我录制完视频后，把2个视频拼接在一起，加起来60秒的视频，转码要20秒，如何减少这个时间

AVAssetExportSession输出合成的视频太慢了

亲，怎么切换摄像头

stop时crash finishWritingWithCompletionHandler

crash必现，即使在前面加上markAsFinished还是crash

dispatch_async(_dispatchQueue, ^{
    [_videoWriterInput markAsFinished];
    [_audioWriterInput markAsFinished];
    [_assetWriter finishWritingWithCompletionHandler:^{

你好，请教个多个动态库符号引用问题。

您好，我再一个开源库中发现这种情况，主程序中有日志模块，包含日志级别、日志文件等多种变量，另一个动态插件是通过dlopen打开的，也需要用到该日志模块。这样插件编译的时候不会编译不过吗？因为这些日志模块的变量、函数都是在主程序中的。请教！！

如果不考虑上下文的话，这句话后半句是不是应该指的是静态库的情况下

• When an app is launched, the app’s code—which includes the code of the static libraries it was linked with—is loaded into the app’s address space.Applications with large executables suffer from slow launch times and large memory footprints

• 静态库：当程序在启动的时候，会将 app 的代码(包括静态库的代码）一起在加载到 app 所处的内存地址上。相比于静态库 的方案，使用动态库将花费更多的启动时间和内存消耗。还会增加可执行文件的大小。