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swift 190531 part1

checking-if-textfields-are-empty-swift
https://stackoverflow.com/questions/38162602/checking-if-textfields-are-empty-swift

xcode-ios-how-to-determine-whether-code-is-running-in-debug-release-build
https://stackoverflow.com/questions/9063100/xcode-ios-how-to-determine-whether-code-is-running-in-debug-release-build

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

storyboard-vs-uistoryboardname-main-bundle-nil
https://stackoverflow.com/questions/32850853/storyboard-vs-uistoryboardname-main-bundle-nil

swift-enums-vs-structures-vs-classes
https://medium.com/@saad.eloulladi/swift-enums-vs-structures-vs-classes-938a4cd76c0d

what-is-swift-enum-byte-representation
https://stackoverflow.com/questions/38305976/what-is-swift-enum-byte-representation

circular-progress-bar-in-ios
https://codeburst.io/circular-progress-bar-in-ios-d06629700334
https://gist.github.com/yogeshmanghnani/d73ad00eed7b3b55784c0d24e9852332
https://gist.githubusercontent.com/yogeshmanghnani/d73ad00eed7b3b55784c0d24e9852332/raw/860c72ddd58a70604f3defb40c15d063341aa609/CircularProgressBar.swift
https://www.youtube.com/watch?v=O3ltwjDJaMk

how-to-change-uicollectionviewcell-size-programmatically-in-swift
https://stackoverflow.com/questions/31662155/how-to-change-uicollectionviewcell-size-programmatically-in-swift

how-to-set-cell-spacing-and-uicollectionview-uicollectionviewflowlayout-size-r
https://stackoverflow.com/questions/28325277/how-to-set-cell-spacing-and-uicollectionview-uicollectionviewflowlayout-size-r

XIB——AutoLayout添加约束
https://blog.csdn.net/gongyuhonglou/article/details/72817711

how-to-set-uicollectionviewcell-width-and-height-programmatically
https://stackoverflow.com/questions/38028013/how-to-set-uicollectionviewcell-width-and-height-programmatically
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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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