Add methods to make images using a DynamicGradient

[yannickl]

Hi Guillaume,

I'm not a big fan of the gradient image API because it introduces inconsistent APIs between iOS, tvOS, watchOS and macOS platforms. Moreover, your tests fail on travis.

DynamicColor is about the color manipulation, not visualisation. Either we create a sub-project with a DynamicGradientView that match the NSGradient macOS counterpart, or we create a new project.

However the isOpaque property is a great idea. You can pull those updates to start. I would just update the gradient one with something like that:

var isOpaque: Bool {
  return colors.reduce(true) { $0.0 && $0.1.isOpaque }
}

[gbitaudeau]

Hi Yannick,

Tests work on Xcode, it's weird that they fail on travis ... One problem I had on Xcode is that ".png" were compress during compilation, to avoid that I changed their extension using ".ref", but I don't know if it works on travis.

I understand your point on APIs inconsistent betweeniOs and the other platforms, but I don't well know macOs counterpart, so I think I will not find the time to make it, sorry.

At the beginning of my pool request, I have a need: make a color using UIColor.init(patternImage: UIImage) to be able to put gardient in some backgrounds of my UIViews. Do we consider that colors with pattern are not real colors and haven't got their place in DynamicColor ?

I will make another request for isOpaque property.

Thanks for your time.

[codecov-io]

Codecov Report

Merging #38 into master will decrease coverage by 4.82%. The diff coverage is 77.57%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage     100%   95.17%   -4.83%     
==========================================
  Files          13       14       +1     
  Lines         390      497     +107     
==========================================
+ Hits          390      473      +83     
- Misses          0       24      +24

Flag	Coverage Δ
#ios	95.17% <77.57%> (-4.83%)	:arrow_down:
#osx	75.65% <0%> (-20.76%)	:arrow_down:

Impacted Files	Coverage Δ
Sources/DynamicColor.swift	100% <100%> (ø)	:arrow_up:
Sources/CGFloat.swift	62.5% <62.5%> (ø)
Sources/DynamicGradient.swift	84.09% <78.35%> (-15.91%)	:arrow_down:

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[yannickl]

Travis uses Xcode to execute the test suite, so it should work in the same way. I should investigate that when I'll have time.

I think I'll create a sub-project with a DynamicGradientView with the same API as NSGradient and we will use your code.