[iOS] 判斷App在前景或背景
收到推播時有兩種狀況：
- 前景 (Foreground)
- 背景 (Background)
Just My Life & My Work
標籤雲
- teach
- ios
- illustration
- food
- app
- life
- record
- chart
- travel
- chat
- tool
- restaurant
- work
- service
- photos
- relationship
- opencv
- experience
- practice
- technique
- problem
- xcode
- statistics
- activity
- design
- health
- information
- love
- comparison
- exercise
- accessory
- company
- art
- book
- story
- apple
- software
- platform
- article
- map
- user interface
- iphone
- animation
- jog
- bike
- photography
- environment
- device
- movies
- marriage
- memory
- thought
- video
- game
- mrt
- project
- festival
- sport
- transportation
- taiwan
- taipei
- opengl
- quotation
- image
- career
- research
- lecture
- ipad
- open source
- youtube
- blender
- development
- song
- objective c
- image processing
- income
- notification
- wealth
- motocycle
- achievement
- glsl
- music
- apple watch
- secret
- friend
- 財富
- 秘密
- paper
- observation
- business
- lyrics
- file
- user experience
- start-up
- competition
- experiment
- library
- all you can eat
- macbook
- product
- movie
- photo
- money
- mountain
- definition
- network
- hotel
- programming
- customization
- wifi
- gift
- weather
- coffee
- line
- camera
- history
- install
- internet
- time
- trend
- job
- mac os x
- birthday
- technology
- process
- debug
- framework
- team
- hamburger
- celebration
- performance
- architecture
- report
- typhoon
- truth
- review
- introduction
- repair
- Ionic
- recall
- breakfast
- reunion
- version
- function
- swift
- growth
- bluetooth
- track
- shop
- notebook
- face detection
- flow
- family
- language
- svm
- friendship
- end banquet
- scenery
- salary
- group
- mission
- election
- tone mapping
- stylization
- firework
- future
- sleep
- learn
- advertisement
- screen
- color space
- photograph
- brand
- hong kong
- profession
- course
- git
- wwdc
- news
- banquet
- certificate
- rule
- buddha
- culture
- flower
- buffet
- photoimpact
- bbq
- event
- smart phone
- crash
- github
- religion
- korea
- role
- setting
- media
- anniversary
- message
- holiday
- communication
- wedding
- cocoapods
- google map
- colleague
- marathon
- high dynamic range
- algorithm
- sex
- conference
- plan
- enterprise
- concept
- attitude
- habit
- rgb
- park
- value
- application
- management
- name
- cartoon
- boss
- share
- uiwebview
- vacation
- convenience store
- flowchart
- ibeacon
- energy
- 疫情
- 新冠肺炎
- celebrity
- mv
- meeting
- decision
- leisure
- analysis
- japan
- night market
- couple
- c++
- web
- stitch
- noodle
- filter
- itunes
逍遙文工作室 
HappyMan・迴響