[iOS] 漸層色彩影像 (Gradient Color Image)
近年來App流行漸層色彩影像 (Gradient Color Image)，我們不想要美術師出圖，因為有很多螢幕尺寸要考量，所以想由程式碼來個別生成。
結果圖上有三個Image View，上圖為單純藍色，左下為水平漸層黑色alpha值由1到0，右下為垂直漸層黑色alpha值由1到0。
我將所需要的程式碼檔案放在GitHub Gist：Gradient Color Image。
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