[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
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- shop
- notebook
- face detection
- family
- language
- svm
- friendship
- end banquet
- scenery
- group
- mission
- certificate
- election
- tone mapping
- stylization
- firework
- future
- sleep
- learn
- event
- crash
- advertisement
- screen
- color space
- photograph
- brand
- hong kong
- profession
- course
- git
- wwdc
- news
- media
- wedding
- banquet
- cocoapods
- rule
- buddha
- culture
- flower
- buffet
- photoimpact
- plan
- bbq
- smart phone
- github
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- role
- setting
- anniversary
- message
- holiday
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- colleague
- marathon
- high dynamic range
- algorithm
- sex
- conference
- enterprise
- web
- concept
- attitude
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- habit
- death
- rgb
- park
- value
- api
- application
- management
- name
- cartoon
- boss
- share
- uiwebview
- security
- sdk
- vacation
- flowchart
- ibeacon
- energy
- 疫情
- 新冠肺炎
- covid-19
- celebrity
- mv
- meeting
- decision
- leisure
- analysis
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