This button will let you just select an alternative which includes your iPhone or iPad now. Now you can easily click on the small downward facing triangle which is just next to the record button. These all options will launch a new QuickTime window for the video recording. Also, you can use an alternative option which is a shortcut given through the keyboard i.e. Launch QuickTime on Mac and select file then under file select New Movie recording which is available on the menu bar.(Suggestion: You may need to “Trust” your Mac so before iPhone works. Connect your iPhone or iPad to Mac using the Lightning cable.To start with the recording of the iPhone or iPad screen on your Mac OS, firstly make sure that you are running with OS X Yosemite and iOS 8.Steps to Record iPhone iPad Screen on Mac QuickTime: 2 Tips to Record iPhone iPad Screen on Windows OS:.1 Steps to Record iPhone iPad Screen on Mac.