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collectionview part 4 swift

string to float swift
https://www.hackingwithswift.com/example-code/language/how-to-convert-a-string-to-a-float

static method with struct method
https://stackoverflow.com/questions/13372194/whats-the-difference-between-a-static-struct-method-and-a-static-class-method

dateformat swift
https://stackoverflow.com/questions/35700281/date-format-in-swift

get specific CALayer swift
https://stackoverflow.com/questions/26402170/how-can-i-select-calayer-in-swift-by-index

replace CALayer
https://stackoverflow.com/questions/39706137/how-to-replace-current-calayer

repeating array swift
https://stackoverflow.com/questions/37095943/repeating-array-in-swift

cell button clicked
https://stackoverflow.com/questions/44368515/swift-3-how-to-get-button-in-uicollectionviewcell-work

cell button clicked with delegate
https://stackoverflow.com/questions/20655060/get-button-click-inside-uitableviewcell
https://medium.com/@aapierce0/swift-using-protocols-to-add-custom-behavior-to-a-uitableviewcell-2c1f09610aa1

multiple select collectionview
https://stackoverflow.com/questions/52757524/how-do-i-got-multiple-selections-in-uicollection-view-using-swift-4

register cell difference with xib


        collectionView.register(SelectRegionViewCell.self, forCellWithReuseIdentifier: "SelectRegion")



        collectionView.register(UINib(nibName: "SelectRegionViewCell", bundle: nil), forCellWithReuseIdentifier: "SelectRegion")


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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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