1. Take modifying QQ program icon as an example. 2. First use the assistant tool to export the QQ application in the mobile phone to the Mac. 3. Do not back up the document when exporting (Do you want to back it up at the same time? 4. Find the previously exported ipa package and right-click the archive utility to extract it. 5. After decompression, enter the decompressed directory, find QQ.app, right-click to display the package content, and enter App6. In the QQ.app package, you will see all the files of the app, among which one file named QQ is the main program and the Info.plist file is the main configuration file. These two files are protected by signatures. After modification, the subsequent installation steps will not be completed. 7. To get to the point, let's take modifying the icon as an example and then replace the original icon. Because the device I use is iPhone5s, I only need to change the icon of 60*60, and pay attention to the resolution of the new icon file and the replaced file. Next, I will install the modified QQ.app, open Xcode and find Window-Devices on the menu. 9. In the device interface that opens, select your device. 10. Then click the+sign marked in the above figure and select the modified QQ.app for installation. 1 1. Then just wait for the installation to complete. (Note: If QQ has been installed at the time of installation, you will be prompted whether to replace it. Click Replace to replace it).