iosIconMaker.sh

#!/usr/bin/env bash
set -e
####
# Author zhongwm 2019-4-20
# This script uses cairosvg (python 3 package) to make iOS app icon from SVG file.
# Prerequisites install: brew install cairo && pip3 install cairosvg;
####
INPUT=$1
INPUT_BASENAME=`basename $INPUT`
INPUT_BASENAME_NOEXT=${INPUT%.*}
echo $INPUT_BASENAME_NOEXT
APPICONSET_DIR="$INPUT_BASENAME_NOEXT.appiconset"

sizes=$(cat <<EOT
1024
120
121
152
167
180
20
29
40
41
42
58
59
60
76
80
81
87
EOT
)

if [[ ! -e $APPICONSET_DIR ]]; then
    mkdir "$APPICONSET_DIR"
elif [[ -f $APPICONSET_DIR ]]; then
    echo There already exist a file named $INPUT_BASENAME_NOEXT, delete?
    rm "$APPICONSET_DIR"
fi

_BACK_IFS=$IFS
IFS="\n"
echo $sizes | while read line
do
    OUTFILE="$APPICONSET_DIR/Icon-$line.png"
    [[ -e $OUTFILE ]] || echo -e "\tGenerating $OUTFILE..."
    [[ -e $OUTFILE ]] && echo -e "\tExist, delete and generating \n\t\t$OUTFILE..." && rm -f $OUTFILE
    # set -x
    realsize=$line
    # 58,59 -> 58
    # 40,41,42 -> 40
    # 120,121 -> 120
    # 80,81 -> 80
    if [[ $line -eq 41 ]]; then
        realsize=40
    elif [[ $line -eq 42 ]]; then
        realsize=40
    elif [[ $line -eq 59 ]]; then
        realsize=58
    elif [[ $line -eq 121 ]]; then
        realsize=120
    elif [[ $line -eq 81 ]]; then
        realsize=80
    fi
    cairosvg -o "${OUTFILE}" --output-width $realsize --output-height $realsize -f png "$INPUT"
    # set +x
done

IFS=$_BACK_IFS

ContentsDotJSON=$(cat <<EOT
{
  "images" : [
    {
      "size" : "20x20",
      "idiom" : "iphone",
      "filename" : "Icon-40.png",
      "scale" : "2x"
    },
    {
      "size" : "20x20",
      "idiom" : "iphone",
      "filename" : "Icon-60.png",
      "scale" : "3x"
    },
    {
      "size" : "29x29",
      "idiom" : "iphone",
      "filename" : "Icon-58.png",
      "scale" : "2x"
    },
    {
      "size" : "29x29",
      "idiom" : "iphone",
      "filename" : "Icon-87.png",
      "scale" : "3x"
    },
    {
      "size" : "40x40",
      "idiom" : "iphone",
      "filename" : "Icon-80.png",
      "scale" : "2x"
    },
    {
      "size" : "40x40",
      "idiom" : "iphone",
      "filename" : "Icon-120.png",
      "scale" : "3x"
    },
    {
      "size" : "60x60",
      "idiom" : "iphone",
      "filename" : "Icon-121.png",
      "scale" : "2x"
    },
    {
      "size" : "60x60",
      "idiom" : "iphone",
      "filename" : "Icon-180.png",
      "scale" : "3x"
    },
    {
      "size" : "20x20",
      "idiom" : "ipad",
      "filename" : "Icon-20.png",
      "scale" : "1x"
    },
    {
      "size" : "20x20",
      "idiom" : "ipad",
      "filename" : "Icon-42.png",
      "scale" : "2x"
    },
    {
      "size" : "29x29",
      "idiom" : "ipad",
      "filename" : "Icon-29.png",
      "scale" : "1x"
    },
    {
      "size" : "29x29",
      "idiom" : "ipad",
      "filename" : "Icon-59.png",
      "scale" : "2x"
    },
    {
      "size" : "40x40",
      "idiom" : "ipad",
      "filename" : "Icon-41.png",
      "scale" : "1x"
    },
    {
      "size" : "40x40",
      "idiom" : "ipad",
      "filename" : "Icon-81.png",
      "scale" : "2x"
    },
    {
      "size" : "76x76",
      "idiom" : "ipad",
      "filename" : "Icon-76.png",
      "scale" : "1x"
    },
    {
      "size" : "76x76",
      "idiom" : "ipad",
      "filename" : "Icon-152.png",
      "scale" : "2x"
    },
    {
      "size" : "83.5x83.5",
      "idiom" : "ipad",
      "filename" : "Icon-167.png",
      "scale" : "2x"
    },
    {
      "size" : "1024x1024",
      "idiom" : "ios-marketing",
      "filename" : "Icon-1024.png",
      "scale" : "1x"
    }
  ],
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}
EOT
)

echo -e $ContentsDotJSON>"$APPICONSET_DIR/Contents.json"