How to resize the iPhone/iPad Simulator?

It's more flexible with Xcode 9-Simulator.Just pick & drag any corner of simulator to resize it and set it according to your requirement.

Look at this snapshot:

---

Note: With Xcode 9.1+, Simulator scale options are changed.

Keyboard short-keys:
According to Xcode 9.1+

Physical Size       ⌘ 1      command + 1
Pixel Accurate      ⌘ 2      command + 2

According to Xcode 9

50% Scale           ⌘ 1      command + 1
100% Scale          ⌘ 2      command + 2
200% Scale          ⌘ 3      command + 3

---

Simulator scale options from Xcode Menu:

Xcode 9.1+:
Menubar ▶ Window ▶ "Here, options available change simulator scale" (Physical Size & Pixel Accurate)

Pixel Accurate: Resizes your simulator to actual (Physical) device's pixels, if your mac system display screen size (pixel) supports that much high resolution, else this option will remain disabled.

Xcode 9.0
Menubar ▶ Window ▶ Scale ▶ "Here, options available change simulator scale"

---

Using Terminal Command
Follow these steps to scale simulator using terminal commands

1. Close/Quit simulator. (if open)
2. Open Terminal app (using Spotlight search, Press ⌘ + SPACE to open spotlight search)
3. Copy following text and paste it next to terminal cursor.

defaults write ~/Library/Preferences/com.apple.iphonesimulator SimulatorWindowLastScale "0.3"

4. Open 'Simulator' (Run your iOS project using Xcode).

You will find simulator scale update.

---

⌘+1 for 100%
⌘+2 for 75%
⌘+3 for 50%