my swift playground stage

This is the puzzle stage I made. You can copy the swift code to your playground and try to solve it. All written in swift. It took me a while to construct this world that can be solved in 5 - 7 lines :D

Hint : it’s inspired by one of the previous stages!

p.s. My brother cannot solve it in less than 7 lines.

let target = Character()
world.place(Gem(), atColumn: 0, row: 5)
world.place(Switch(), atColumn: 7, row: 6)
for i in 1 ... 6 {
    world.place(Block(), atColumn: i, row: 3)
}
for i in 1 ... 6 {
    world.place(Block(), atColumn: i, row: 3)
}
let greenPortal = Portal(color:  colorLiteral(red: -0.24377164244651794, green: 0.7537863850593567, blue: -0.22403845191001892, alpha: 1.0))
world.place(greenPortal, atStartColumn: 0, startRow: 3, atEndColumn: 2, endRow:7)
let redPortal = Portal(color:  colorLiteral(red: 1.0929099321365356, green: -0.22076299786567688, blue: -0.09911013394594193, alpha: 1.0))
world.place(redPortal, atStartColumn: 2, startRow: 1, atEndColumn: 5, endRow:5)
let bluePortal = Portal(color:  colorLiteral(red: 0.0028873691335320473, green: 0.37862303853034973, blue: 0.992986261844635, alpha: 1.0))
world.place(bluePortal, atStartColumn: 6, startRow: 1, atEndColumn: 2, endRow: 4)
world.place(Platform(), atColumn: 3, row: 4)
world.place(Block(), atColumn:4, row:1)
world.place(Block(), atColumn:4, row:2)
world.place(Platform(), atColumn: 4, row: 1)
world.place(target, atColumn: 3, row: 2)