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1. Alias UIKit and AppKit classes

   #if TARGET_OS_IPHONE
   #import <UIKit/UIKit.h>
   #else
       @compatibility_alias UIColor NSColor;
   #endif
   

2. Enforce iOS 6's UI

   [[NSUserDefaults standardUserDefaults] setObject:@YES forKey:@"UIUseLegacyUI"]
   

   https://twitter.com/stroughtonsmith/status/384679231730761728

3. Get the UIImage from a UIView

   - (UIImage *)image {
       UIGraphicsBeginImageContext(self.frame.size);
       [self.layer renderInContext:UIGraphicsGetCurrentContext()];
       UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
       UIGraphicsEndImageContext();
       return img;
   }
   

4. Hide status bar

   - (void)applicationDidFinishLaunching:(UIApplication *)application {
       application.statusBarHidden = YES;
       // ...
   }
   

5. Prevent device from going to sleep

   [UIApplication sharedApplication].idleTimerDisabled = YES;
   

6. Simulate memory warnings

   #ifdef DEBUG
   [NSTimer scheduledTimerWithTimeInterval:1.0
                                    target:application
                                  selector:@selector(_performMemoryWarning)
                                  userInfo:nil
                                   repeats:YES];
   #endif
   

7. UIView recursive description

   po [UIView recursiveDescription]
   

   results:

   <UIView: 0x4b4d3d0; frame = (0 20; 320 460); (...)
      | <MyView: 0x4b4b800; frame = (20 20; 237 243); (...)
      |    | <UIRoundedRectButton: 0x4b4e790; (...)
      |    |   | <UIButtonLabel: 0x4b4f190; (...)