IOS10将所有xcode控制台日志打印到iPhone应用程序页面内的UITextview上

if let consoleTextView = window?.rootViewController?.view.viewWithTag(100) as? UITextView {
    freopen(nil, "a+", stderr)
    let consoleOutputFile = dup(fileno(stderr))
    let pipe = Pipe()
    dup2(pipe.fileHandleForWriting.fileDescriptor, fileno(stderr))
    pipe.fileHandleForReading.readabilityHandler = { handle in
        if let line = String(data: handle.availableData, encoding: .utf8) {
            DispatchQueue.main.async {
                consoleTextView.text += line
            }
        }
    }
    DispatchQueue.global(qos: .background).async {
        while true {
            if let line = readLine() {
                DispatchQueue.main.async {
                    consoleTextView.text += line + "\n"
                }
            }
        }
    }
}