[iOS] 單例 (Singleton)
單例 (Singleton) 或稱單一實體，也就是程式運行時，此Class永遠只有一個實體。
原本生成一個實體寫法：
HappyClass *class = [[HappyClass alloc] init];
程式每次執行到此，都會重新生成一個實體。若有多重執行緒，很有可能不小心生成多個實體；或是操作流程多變，也是可能會生成多個實體。
Just My Life & My Work
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- information
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- objective c
- image processing
- income
- notification
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- glsl
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- user experience
- start-up
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- celebration
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- function
- swift
- growth
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- 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
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- 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
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