Manage cocoaPods with multiple project in one workspace.

You can manage your cocoaPods for each project in same workspace.
and also even add child target in your project target like today extension.

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

use_frameworks!

workspace 'doriTest'

def common
    pod 'RealmSwift'
end

target 'textAttachment' do
    xcodeproj 'project/textAttachment/textAttachment.xcodeproj'
    common
end

target 'widget' do
    xcodeproj 'project/widget/widget.xcodeproj'
    common
    target 'today' do
    end
end

Now, you are a cocoaPods master :)