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iOS corebluetooth

https://www.jianshu.com/p/9591f1b8b7eb
http://southpeak.github.io/2014/07/31/core-bluetooth-programming-guide-2/

printing-a-variable-memory-address-in-swift
https://stackoverflow.com/questions/24058906/printing-a-variable-memory-address-in-swift

ios-stay-connected-to-an-external-ble-device-as-much-as-possible
https://medium.com/arkulpa/ios-stay-connected-to-an-external-ble-device-as-much-as-possible-699d434846d2

save-custom-objects-into-nsuserdefaults
https://stackoverflow.com/questions/29986957/save-custom-objects-into-nsuserdefaults
https://stackoverflow.com/questions/26469457/saving-custom-swift-class-with-nscoding-to-userdefaults
https://stackoverflow.com/questions/29986957/save-custom-objects-into-nsuserdefaults
https://stackoverflow.com/questions/44876420/save-struct-to-userdefaults

ble autoreconnect
http://muhlenxi.com/2017/07/07/About-Ble-Auto-Connecting/

how-to-compare-two-struct-objects
https://stackoverflow.com/questions/46074718/how-to-compare-two-struct-objects

how-to-store-a-cbperipheral-for-use-in-other-views
https://stackoverflow.com/questions/17455240/how-to-store-a-cbperipheral-for-use-in-other-views

find-object-with-property-in-array
https://stackoverflow.com/questions/26073331/find-object-with-property-in-array

swift基礎-錯誤處理-try-try-try-
https://medium.com/one-two-swift/swift%E5%9F%BA%E7%A4%8E-%E9%8C%AF%E8%AA%A4%E8%99%95%E7%90%86-try-try-try-1339ab450dc6
https://itisjoe.gitbooks.io/swiftgo/content/ch2/error-handling.html

find-an-object-in-array
https://stackoverflow.com/questions/28727845/find-an-object-in-array

how-to-navigate-through-textfields-next-done-buttons
https://stackoverflow.com/questions/1347779/how-to-navigate-through-textfields-next-done-buttons?noredirect=1&lq=1

circlebar
https://www.iostutorialjunction.com/2018/05/how-to-create-circular-progress-view-swift-tutorial.html
https://www.youtube.com/watch?v=O3ltwjDJaMk
https://www.hackingwithswift.com/example-code/calayer/how-to-make-a-shape-draw-itself-using-strokeend

swift-determine-ios-screen-size
https://stackoverflow.com/questions/24110762/swift-determine-ios-screen-size

how-to-add-textfield-in-uialertcontroller
https://stackoverflow.com/questions/34504317/how-to-add-textfield-in-uialertcontroller

Day-14 Swift 語法(10) - 多種用途的 Enumerations
https://ithelp.ithome.com.tw/articles/10195397
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