文件列表:

.DS_Store (6148, 2016-07-10)
Indicator.gif (355509, 2016-07-10)
LICENSE (1084, 2016-07-10)
Material Loading Indicator.playground/ (0, 2016-07-10)
Material Loading Indicator.playground/Contents.swift (2251, 2016-07-10)
Material Loading Indicator.playground/Sources/ (0, 2016-07-10)
Material Loading Indicator.playground/Sources/LoadingIndicatorView.swift (3732, 2016-07-10)
Material Loading Indicator.playground/contents.xcplayground (246, 2016-07-10)
Material Loading Indicator.playground/playground.xcworkspace/ (0, 2016-07-10)
Material Loading Indicator.playground/playground.xcworkspace/contents.xcworkspacedata (225, 2016-07-10)
Material Loading Indicator.playground/playground.xcworkspace/xcuserdata/ (0, 2016-07-10)
Material Loading Indicator.playground/playground.xcworkspace/xcuserdata/nsakaimbo.xcuserdatad/ (0, 2016-07-10)
Material Loading Indicator.playground/playground.xcworkspace/xcuserdata/nsakaimbo.xcuserdatad/UserInterfaceState.xcuserstate (17830, 2016-07-10)
Material Loading Indicator.playground/timeline.xctimeline (120, 2016-07-10)

# Material Loading Indicator Some fun with `Core Animation` - making an Android-inspired, material loading indicator.

This little project is based on a neat tutorial by Matthew Cheok on implementing an [Android-inspired, material-style loading indicator](http://blog.matthewcheok.com/design-teardown-spinning-indicator/), with some minor parameterization and re-factoring. **Update:** Funny story: this harmless little project led to a very brief moment of Twitter celebrity. Soon after posting this playground, I tweeted about an initialization technique learned from persuing Erica Sadun's Github, which I used for my re-factoring of this project. Namely, you can initialize a Swift constant without having to use intermediate property declarations within the initializing closure. Instead, you can refer to the initialized property using positional references, like so: ``` let strokeStartAnimation: CAAnimation = { $0.beginTime = tailDelay $0.fromValue = 0.0 $0.toValue = 1.0 $0.duration = tailDuration $0.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut) return $0 }(CABasicAnimation(keyPath: "strokeStart")) ``` It's a minor tweak, but makes the declaration a lot more elegant to read (and to write). Apparently, the iOS community thought so too - enough to get [re-tweeted](https://twitter.com/nick_skmbo/status/735109452827877377) over 100 times! In fact, it caused enough of a stir in the iOS-Twitterverse that within a day, [Natasha The Robot had written a whole blog post about it](https://www.natashatherobot.com/swift-configuring-a-constant-using-shorthand-argument-names/)! Happy that everyone had fun with this tidbit. Makes me wonder how many of these little gems are still yet to be discovered (or popularized) as a result of a deeper understanding of the Swift language and its compiler.

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