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1. asm <-> opcodes

   $ echo "0x28 0x46" | llvm-mc --disassemble -triple=thumbv7
       .text
       mov r0, r5
   
   $ echo "mov r0, r5" | llvm-mc -assemble -triple=thumbv7 -show-encoding
       .text
       mov r0, r5                  @ encoding: [0x28,0x46]
   
   $ echo "movs r0, 0x1" | llvm-mc -assemble -triple=thumbv7 -show-encoding
       .text
       movs    r0, #1                  @ encoding: [0x01,0x20]
   

   See also iOS binary patching: http://www.zdziarski.com/blog/?p=2172

2. Crop iPhone simulator screenshots with Acorn
   1. take a screenshot with cmd-alt-4-space
   2. open it in Acorn
   3. go to menu Image > Crop
   4. from 47 151
   5. size 320 460
3. Crop iPhone simulator screenshots with Python Image Library

   from PIL import Image
   
   LEFT = 38
   TOP = 146
   WIDTH = 320
   HEIGHT = 460
   
   img = Image.open('sc.png')
   box = (LEFT, TOP, LEFT+WIDTH, TOP+HEIGHT)
   area = img.crop(box)
   
   area.save('sc2.png')
   

4. Draw a frame around a UIView

   #import <QuartzCore/QuartzCore.h>
   ...
   view.layer.borderColor = [UIColor blackColor].CGColor;
   view.layer.borderWidth = 1;
   

5. Dump iOS network packets from the device

   $ rvictl -s UDID
   $ sudo launchctl list com.apple.rpmuxd
   $ sudo tcpdump -n -t -i rvi0 -q tcp
   

6. Ensuring the archive to be published is entitled for production APNS

   $ codesign -d --entitlements - MyApp.app
   

   the result should include:

   <key>aps-environment</key>
   <string>production</string>
   

7. Field test

   With an iPhone, dial and call:

   *3001#12345#*
   

8. Language and locale environment variables

   Add them into scheme > arguments

   -AppleLanguages (de)
   -AppleLocale fr_FR
   

9. Log the whole views hierarchy

   po [[[UIApplication sharedApplication] keyWindow] recursiveDescription]
   

10. macro to recognize iOS from tvOS

    #if os(iOS)
    #elseif os(tvOS)
    #else
    #endif
    

11. Re-sign a binary

    $ export CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate
    $ codesign -fs "MyName" MyBinary
    

12. Recognize iPhone and iPad at runtime

    if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad ) {
        // ...
    }
    

13. Record movie in iOS Simulator

    xcrun simctl io booted recordVideo movie.mp4