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  [[self.scrollView subviews] enumerateObjectsUsingBlock:^(UIView *obj, NSUInteger idx, BOOL *stop) {
    [UIView animateWithDuration:0.25 animations:^{
      obj.alpha = 0.0;
    } completion:^(BOOL finished) {
      [obj removeFromSuperview];
    }];
  }];

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// Version 1
[[self.scrollView subviews] enumerateObjectsUsingBlock:^(UIView *obj, NSUInteger idx, BOOL *stop) {
  [UIView animateWithDuration:0.25 animations:^{
    obj.alpha = 0.0;
  } completion:^(BOOL finished) {
    [obj removeFromSuperview];
  }];
}];

// Version 2

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- (IBAction)buttonPressed:(id)sender {
  if (timer == nil) {
    seconds = 30;
    timer = [[NSTimer scheduledTimerWithTimeInterval:1.0
                                              target:self
                                            selector:@selector(updateCounter:)
                                            userInfo:nil
                                             repeats:YES] retain];
  }
}

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// Use debugLog() or debugLogPretty() to log messages to the console when the "Debug" configuration 
// is used to build the project - these logging messages won't appear in a Release build.
//
// Use assertLog() for more serious conditions. On Debug builds, assertLog() will throw an assertion
// and on Release builds it will turn into a standard NSLog (in case it comes to digging through a user's
// device logs to fix something)
#ifdef DEBUG
  #define _D(...) __VA_ARGS__
  #define debugLog(fmt, ...)        NSLog(fmt, ##__VA_ARGS__)
  #define debugLogPretty(fmt, ...)  NSLog(@"%s (%@:%d)\n%@", \

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final section layout:
    __TEXT/__text addr=0x00002000, size=0x000C802C, fileOffset=0x00001000, type=1
    __TEXT/__stub_helper addr=0x000CA02C, size=0x0000102C, fileOffset=0x000C902C, type=31
    __TEXT/__gcc_except_tab addr=0x000CB058, size=0x00000906, fileOffset=0x000CA058, type=0
    __TEXT/__cstring addr=0x000CB960, size=0x00035F3D, fileOffset=0x000CA960, type=12
    __TEXT/__const addr=0x001018A0, size=0x00000270, fileOffset=0x001008A0, type=0
    __TEXT/__ustring addr=0x00101B10, size=0x00000002, fileOffset=0x00100B10, type=15
    __TEXT/__symbolstub1 addr=0x00101B14, size=0x00000558, fileOffset=0x00100B14, type=34
    __DATA/__lazy_symbol addr=0x00103000, size=0x00000558, fileOffset=0x00102000, type=35
    __DATA/__program_vars addr=0x00103558, size=0x00000014, fileOffset=0x00102558, type=29

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// This in the .pch file...
#ifdef DEBUG
#elseif
#ifndef NS_BLOCK_ASSERTIONS
#define NS_BLOCK_ASSERTIONS
#endif
#endif

// ..causes this to generate a compiler error.
// Use of undeclared identifier 'derp'

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- (void)transitionToNewRootViewController:(UIViewController *)newRootVC animated:(BOOL)animated moveToLeft:(BOOL)moveToLeft {
  UIViewController *rootVC = self.window.rootViewController;
  if (rootVC == newRootVC) {
    return;
  }

  CGFloat direction = (moveToLeft) ? 1 : -1;

  CGRect initialFromFrame = rootVC.view.frame;
  CGRect initialToFrame = initialFromFrame;

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NSError *error = nil;
if (![self myMethodThatCanFail:&error]) {
  NSLog(@"%@", error);
}

////////

- (BOOL)myMethodThatCanFail:(NSError **)errorPtr {
  // This method sucks so much that it always fails :(
  if (errorPtr != NULL) {

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// Uses a private internal subclass to allow for loading the view from within a NIB.
// The subclass allows us to break the initialization loop that would otherwise occur.
@interface SomeMyView__ : SomeMyView {
  
}
@end

@implementation SomeMyView

+ (SomeMyView*)loadFromNib {

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@interface A : NSObject
- (NSDictionary *)someDictionaryForSomething;
@end

@interface B : A

@end

@implementation B