When inserting a layer, lock ratio of shape

`↑ Shift` + `Mouse movement`

All hotkeys for Sketch

Zooming and navigating Pan Canvas	`Space` + `Mouse movement` + `Mouse left click`
Zooming and navigating Zoom in	`⌘ Cmd` + `+`
Zooming and navigating Zoom out	`⌘ Cmd` + `-`
Zooming and navigating Zoom to 100%	`⌘ Cmd` + `0`
Zooming and navigating Zoom to all elements on Canvas	`⌘ Cmd` + `1`
Zooming and navigating Zoom to selected layer(s)	`⌘ Cmd` + `2`
Zooming and navigating Center selected layer(s) in the Canvas	`⌘ Cmd` + `3`
Zooming and navigating Zoom to area	`Z` + `Mouse movement`
Display Toggle Presentation mode (hides everything except the canvas)	`⌘ Cmd` + `.`
Zooming and navigating Select next Artboard	`Fn` + `→`
Zooming and navigating Select previous Artboard	`Fn` + `←`
Zooming and navigating Previous page	`Fn` + `↑`
Zooming and navigating Next page	`Fn` + `↓`
Inserting layers Rectangle	`R`
Inserting layers Oval	`O`
Inserting layers Text tool	`T`
Inserting layers Artboard tool	`A`
Inserting layers Slice tool	`S`
Inserting layers Paste over selection	`↑ Shift` + `⌘ Cmd` + `V`
Selecting layers Selects layer within drag bounds	`⌥ Option` + `Mouse movement`
Inserting layers When inserting a layer, lock ratio of shape	`↑ Shift` + `Mouse movement`
Inserting layers Move newly drawn layer before confirming it	`Space` + `Mouse movement`
Vector points Shape Edit Mode	`Mouse double click`
Selecting layers (click layer) Select layer within group	`⌘ Cmd` + `Mouse left click`
Arranging layers (click Align buttons) Align layer to Artboard	`⌥ Option` + `Mouse left click`
Selecting layers Select all Artboards	`↑ Shift` + `⌘ Cmd` + `A`
Vector points Select Multiple Points	`↑ Shift` + `Mouse left click`
Selecting layers Add layer from group to selection in Canvas	`↑ Shift` + `⌘ Cmd` + `Mouse left click`
Vector points Next Point	`⭾ Tab`
Selecting layers Select previous layer in group	`↑ Shift` + `⭾ Tab`
Vector points Shape Edit Mode	`⤶ Enter`
Editing layers Finish editing	`Esc`
Moving and resizing layers (hover mouse) Display distance between other layers	`⌥ Option` + `Mouse movement`
Moving and resizing layers (resize while holding) Resize from center	`⌥ Option`
Vector points (hold) Draw Straight Lines. With the active Vector Tool, you can create a new point aligned at 45° angles to the previous point	`↑ Shift`
Moving and resizing layers Duplicate	`⌘ Cmd` + `D`
Moving and resizing layers Duplicate	`⌥ Option` + `Mouse movement` + `Mouse left click`
Moving and resizing layers Constrain move	`↑ Shift` + `Mouse movement` + `Mouse left click`
Moving and resizing layers Disable smart guides	`⌘ Cmd` + `Mouse movement` + `Mouse left click`
Moving and resizing layers Lock drag to selection	`⌥ Option` + `⌘ Cmd` + `Mouse movement` + `Mouse left click`
Moving and resizing layers Nudge position by 1px	`← ↑ → ↓`
Moving and resizing layers Nudge position by 10px	`↑ Shift` + `← ↑ → ↓`
Moving and resizing layers Expand by 1 px	`⌘ Cmd` + `→`
Moving and resizing layers Expand by 1 px	`⌘ Cmd` + `↓`
Moving and resizing layers Contract by 1 px	`⌘ Cmd` + `←`
Moving and resizing layers Contract by 1 px	`⌘ Cmd` + `↑`
Moving and resizing layers Expand by 10 px	`↑ Shift` + `⌘ Cmd` + `→`
Moving and resizing layers Expand by 10 px	`↑ Shift` + `⌘ Cmd` + `↓`
Moving and resizing layers Contract by 10 px	`↑ Shift` + `⌘ Cmd` + `←`
Moving and resizing layers Contract by 10 px	`↑ Shift` + `⌘ Cmd` + `↑`
Moving and resizing layers Scale layer	`↑ Shift` + `K`
General Copy layer style	`⌥ Option` + `⌘ Cmd` + `C`
General Paste layer style	`⌥ Option` + `⌘ Cmd` + `V`
Editing layers Toggle fill	`F`
Editing layers Toggle border	`B`
Editing layers Activate color picker	`Control` + `C`
Editing layers Set layer opacity	`0` - `9`
Editing layers Use as mask	`Ctrl` + `⌘ Cmd` + `M`
Symbols Return to Last Symbol Instance	`⌘ Cmd` + `Esc`
Editing layers Delete layer	`Del`
Text editing Paste as rich text	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `V`
Text editing Increase font size	`⌥ Option` + `⌘ Cmd` + `+`
Text editing Decrease font size	`⌥ Option` + `⌘ Cmd` + `-`
Text editing Increase character spacing	`Control` + `⌥ Option` + `L`
Text editing Decrease character spacing	`Control` + `⌥ Option` + `T`
Text editing Align left	`Shif` + `tCommand` + `{`
Text editing Align center	`↑ Shift` + `⌘ Cmd` + `\|`
Text editing Align right	`↑ Shift` + `⌘ Cmd` + `}`
Text editing Convert to outlines	`↑ Shift` + `⌘ Cmd` + `O`
Text editing Insert a line break	`↑ Shift` + `⤶ Enter`
Arranging layers Group selection	`⌘ Cmd` + `G`
Arranging layers Rename layer	`⌘ Cmd` + `R`
Arranging layers Ungroup	`↑ Shift` + `⌘ Cmd` + `G`
Arranging layers Bring forward	`⌥ Option` + `⌘ Cmd` + `↑`
Arranging layers Bring to front	`Ctrl` + `⌥ Option` + `⌘ Cmd` + `↑`
Arranging layers Send backward	`⌥ Option` + `⌘ Cmd` + `↓`
Arranging layers Send to back	`Ctrl` + `⌥ Option` + `⌘ Cmd` + `↓`
Arranging layers Move up out of group/artboard	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `↑`
Arranging layers Distribute horizontally	`Ctrl` + `⌘ Cmd` + `H`
Arranging layers Distribute vertically	`Ctrl` + `⌘ Cmd` + `V`
Arranging layers Hide/show layer	`↑ Shift` + `⌘ Cmd` + `H`
Arranging layers Lock/unlock layer	`↑ Shift` + `⌘ Cmd` + `L`
Exporting layers Export layer	`↑ Shift` + `⌘ Cmd` + `E`
Exporting layers (Drag a layer/thumbnail to Canvas) Insert flattened duplicate	`Mouse movement` + `Mouse left click`
Exporting layers (in layer name) Include folder in export	`/`
Display Toggle full-screen mode	`Control` + `⌘ Cmd` + `F`
Display Minimize window	`⌘ Cmd` + `M`
Display Toggle toolbar visibility	`⌥ Option` + `⌘ Cmd` + `T`
Display Toggle Layer List visibility	`⌥ Option` + `⌘ Cmd` + `1`
Display Toggle Inspector visibility	`⌥ Option` + `⌘ Cmd` + `2`
Display Toggle Layer List and Inspector visibility	`⌥ Option` + `⌘ Cmd` + `3`
General Save document. Once you save your Sketch document, Mac will auto-save the file continuously. This can be turned off from Sketch > Preferences > General or Cmd + ,	`⌘ Cmd` + `S`
General Save document copy as	`⌘ Cmd` + `⌥ Option` + `↑ Shift` + `S`
General Find layer by name	`⌘ Cmd` + `F`
General Copy layer	`⌘ Cmd` + `C`
General Paste layer	`⌘ Cmd` + `V`
General Paste in place	`Mouse left click` + `⌘ Cmd` + `↑ Shift` + `V`
General Open Preferences window	`⌘ Cmd` + `,`
Spell checker and dictation Check spelling. Use this shortcut multiple time to check spelling of each word. Misspelled words will be shown as highlighted	`⌘ Cmd` + `;`
Spell checker and dictation Show spelling and grammar pane (in text edit mode)	`↑ Shift` + `⌘ Cmd` + `;`
Spell checker and dictation In text edit mode, you can dictate text instead of typing. This requires downloading "Enhanced Dictation" whichis about 1,2GB	`Fn` then `Fn`
Symbols Create Symbols (Custom Shortcut)	`⌘ Cmd` + `↑ Shift` + `C`
Symbols Go to Master Symbol	`Mouse left click` + `⤶ Enter`
Symbols Next or Previous Page. If you Choose to Send Symbol to "Symbols" Page, you can use these shortcuts to navigate between your Pages	`Fn` + `↑ ↓`
Vector points Vector tool	`V`
Vector points Straight line	`1`
Vector points Mirrored	`2`
Vector points Disconnected	`3`
Vector points Asymmetric	`4`
Vector points Show Only Selected Point	`Alt`
Vector points (hold) Snap to Middle Point. Click on a line between two points, Sketch will insert the point exactly in the middle of the line	`⌘ Cmd`