how to download logs file using objective c

> In Xcode, go to Window -> Devices. > Select your device in the left panel. > Click the little arrow as shown in the screenshot below. http://i.stack.imgur.com/acpO7.png How to get above image contain refer above url and step. my question of how to fetch above image display all contain and write file. means my device which application open and how many time open data fetch. for example of me create this type application: https://play.google.com/store/apps/details?id=com.zerodesktop.appdetox.qualitytime&hl=en