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new iOS app start

register collectionview cell
https://stackoverflow.com/questions/41191491/using-collectionview-in-uiview-with-xib-file

Alamofire 4 to 5 no request
https://stackoverflow.com/questions/28549832/module-alamofire-has-no-member-named-request

json to model
https://app.quicktype.io/

completionhandler swift4.2  Medium
https://medium.com/@nimjea/completion-handler-in-swift-4-2-671f12d33178

closure
https://stackoverflow.com/questions/50243148/swift-why-dont-class-methods-need-closure-lists

layout comparison code xib storybord
https://onevcat.com/2013/12/code-vs-xib-vs-storyboard/

appcoda grand-central-dispatch GCD
https://www.appcoda.com.tw/grand-central-dispatch/
https://stackoverflow.com/questions/29852431/alamofire-asynchronous-completionhandler-for-json-request

storyboard outlet and referencing outlet
https://stackoverflow.com/questions/633295/what-is-a-referencing-outlet

struct init with property
https://stackoverflow.com/questions/37553626/swift-initialize-struct-with-optional-stored-properties

call different storyboard viewcontroller
https://stackoverflow.com/questions/24840306/how-to-call-different-storyboards-via-swift-for-ios

check textfield isempty or nil
https://stackoverflow.com/questions/24102641/how-to-check-if-a-text-field-is-empty-or-not-in-swift

#pragma mark
https://stackoverflow.com/questions/24017316/pragma-mark-in-swift

hiding keyboard with return key
https://stackoverflow.com/questions/24180954/how-to-hide-keyboard-in-swift-on-pressing-return-key

move view upper and touch anywhere close keyboard
https://stackoverflow.com/questions/24126678/close-ios-keyboard-by-touching-anywhere-using-swift
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collection view part6 swift

preselect collectionview https://stackoverflow.com/questions/45610785/how-to-preselect-and-highlight-a-cell-from-a-uicollectionview https://hackernoon.com/uicollectionviewcell-selection-made-easy-41dae148379d if collectionview allow multiple selection remeber add this, cell item could be Deselect collectionView. selectItem (at: indexPath, animated: true , scrollPosition: . top ) https://stackoverflow.com/questions/15330844/uicollectionview-select-and-deselect-issue save indexpath userdefault https://stackoverflow.com/questions/34804294/how-to-save-nsindexpath-locally https://stackoverflow.com/questions/37001643/how-to-add-nsindexpath-to-nsuserdefaults-in-swift navigation presneted viewcontroller dismiss https://stackoverflow.com/questions/31205002/why-is-it-bad-practice-to-have-a-viewcontroller-dismiss-itself indexpath comparison         if selectIndexPath . contains (indexPath) {             cell. isSelect...
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collection view part3 swift

make random color for test, i put in cell background color watch diff https://stackoverflow.com/questions/29779128/how-to-make-a-random-color-with-swift because use CYlayer, i have to remove layer https://stackoverflow.com/questions/10789766/remove-all-sublayers-from-a-view https://stackoverflow.com/questions/37581951/ios-how-to-remove-previously-added-sublayers-of-a-uiview/37581988 alpha gradint with imageview https://stackoverflow.com/questions/11807876/transparent-alpha-gradient-with-core-graphic-iphone swift map and flatmap http://swiftcafe.io/2016/03/28/about-map/ get local date and time https://stackoverflow.com/questions/28404154/swift-get-local-date-and-time swift dictionary basic https://stackoverflow.com/questions/27313242/how-to-append-elements-into-dictionary-in-swift add 1 day to NSDate https://stackoverflow.com/questions/5067785/how-do-i-add-1-day-to-an-nsdate get keys from dictionay https://stackoverflow.com/questions/26386093/array-from-dictionary...
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js30 d27 drag跑馬燈

https://github.com/richardhsieh18/js30/tree/master/course27 CSS transform: scale(0.98);  =>  transform: scale(1); js     isDown = true;     slider.classList.add('active');     startX = e.pageX - slider.offsetLeft;     scrollLeft = slider.scrollLeft;   });     if(!isDown) return; //stop the function from running     e.preventDefault();     const x = e.pageX - slider.offsetLeft;     const walk = (x - startX) * 3;     slider.scrollLeft = scrollLeft - walk;   });
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