@interface TestViewController : UIViewController
{
  UITextView  *textViewStatus;
}

- (NSString *)obfuscate:(NSString *)string withKey:(NSString *)key
{
  // Create data object from the string
  NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
 
  // Get pointer to data to obfuscate
  char *dataPtr = (char *) [data bytes];
 
  // Get pointer to key data
  char *keyData = (char *) [[key dataUsingEncoding:NSUTF8StringEncoding] bytes];
 
  // Points to each char in sequence in the key
  char *keyPtr = keyData;
  int keyIndex = 0;
 
  // For each character in data, xor with current value in key
  for (int x = 0; x < [data length]; x++) 
  {
    // Replace current character in data with 
    // current character xor'd with current key value.
    // Bump each pointer to the next character
    *dataPtr = *dataPtr++ ^ *keyPtr++; 
 
    // If at end of key data, reset count and 
    // set key pointer back to start of key value
    if (++keyIndex == [key length])
      keyIndex = 0, keyPtr = keyData;
  }
 
  return [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
}

NSString *str = @"iPhoneDeveloperTips"; 
NSLog(@"Input string:%@", str);		
 
// Obfuscate string
NSString *obfuscatedStr = [self obfuscate:str withKey:@"+@$"];
NSLog(@"Obfuscated string:%@", obfuscatedStr);	
 
// Run obfuscate again to get the original string
str = [self obfuscate:obfuscatedStr withKey:@"+@$"];
NSLog(@"Final string:%@", str);

@interface NSString (TruncateToWidth)
 
- (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font;
 
@end

#import "NSString+TruncateToWidth.h"
 
#define ellipsis @"…"
 
@implementation NSString (TruncateToWidth)
 
- (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font
{
  // Create copy that will be the returned result
  NSMutableString *truncatedString = [[self mutableCopy] autorelease];
 
  // Make sure string is longer than requested width
  if ([self sizeWithFont:font].width > width)
  {
    // Accommodate for ellipsis we'll tack on the end
    width -= [ellipsis sizeWithFont:font].width;
 
    // Get range for last character in string
    NSRange range = {truncatedString.length - 1, 1};
 
    // Loop, deleting characters until string fits within width
    while ([truncatedString sizeWithFont:font].width > width) 
    {
      // Delete character at end
      [truncatedString deleteCharactersInRange:range];
 
      // Move back another character
      range.location--;
    }
 
    // Append ellipsis
    [truncatedString replaceCharactersInRange:range withString:ellipsis];
  }
 
  return truncatedString;
}
 
@end

NSString *str = @"Lorem ipsum dolor sit amet, consectetuer adipiscing";
 
// Adjust the width parameter to change the final string width
str = [str stringByTruncatingToWidth:170 withFont:[UIFont systemFontOfSize:15]];
NSLog(@"%@", str);

mp =  [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
 
[[NSNotificationCenter defaultCenter] addObserver:self 
                     selector:@selector(moviePreloadDidFinish:) 
                     name:MPMoviePlayerContentPreloadDidFinishNotification 
                     object:mp];
}

- (void) moviePlayBackDidFinish:(NSNotification*)notification 
{
  NSDictionary *userInfo = [notification userInfo];
 
  NSLog(@"MPMoviePlayerPlaybackDidFinishReasonUserInfoKey: %@",
    [userInfo objectForKey:@"MPMoviePlayerPlaybackDidFinishReasonUserInfoKey"]);
 
  ...
}

enum {
   MPMovieFinishReasonPlaybackEnded,
   MPMovieFinishReasonPlaybackError,
   MPMovieFinishReasonUserExited
};
typedef NSInteger MPMovieFinishReason;

if ([[userInfo objectForKey:@"MPMoviePlayerPlaybackDidFinishReasonUserInfoKey"] intValue] == MPMovieFinishReasonUserExited)
    NSLog(@"User stopped playback");

mp =  [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
 
[[NSNotificationCenter defaultCenter] addObserver:self 
                     selector:@selector(moviePreloadDidFinish:) 
                     name:MPMoviePlayerContentPreloadDidFinishNotification 
                     object:mp];

- (void) moviePlayBackDidFinish:(NSNotification*)notification 
{
  MPMoviePlayerController *mpObject = (MPMoviePlayerController *) [notification object]; 
...

// This is required in order to access the CALayer properties
#import <QuartzCore/QuartzCore.h>
 
// Create UIWebview
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(5, 20, 310, 220)];
 
// Round corners using CALayer property
[[webView layer] setCornerRadius:10];
[webView setClipsToBounds:YES];
 
// Create colored border using CALayer property
[[webView layer] setBorderColor:
   [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor]];
[[webView layer] setBorderWidth:2.75];
 
[[self view] addSubview:webView];
 
...
 
[webView release];

// Get access to a file manager as our means
// to perform file operations
NSFileManager *fileManager = [NSFileManager defaultManager];
 
// Using the application home directory, get dictionary of attributes
NSDictionary *attributesDict = [fileManager attributesOfFileSystemForPath:NSHomeDirectory() error:NULL];
 
// Print total file system size and available space
NSLog(@"System size: %lld", [[attributesDict objectForKey:NSFileSystemSize] longLongValue]);
NSLog(@"System free space: %lld", [[attributesDict objectForKey:NSFileSystemFreeSize] longLongValue]);    
 
// Create formatter
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];  
 
//--------------------------------------------
// Set to decimal style and output to console
//--------------------------------------------
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formattedOutput = [formatter stringFromNumber:[attributesDict objectForKey:NSFileSystemFreeSize]];
NSLog(@"System free space: %@", formattedOutput);

//--------------------------------------------
// Format style as currency, output to console
//--------------------------------------------
[formatter setNumberStyle:NSNumberFormatterCurrencyStyle];
formattedOutput = [formatter stringFromNumber:[attributesDict objectForKey:NSFileSystemFreeSize]];
NSLog(@"Output as currency: %@", formattedOutput);
 
//--------------------------------------------
// Change local and output as currency
//--------------------------------------------
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"it_IT"];
[formatter setLocale:locale];
formattedOutput = [formatter stringFromNumber:[attributesDict objectForKey:NSFileSystemFreeSize]];
NSLog(@"Output as currency - locale it_IT: %@", formattedOutput);

//--------------------------------------------
// Format style as percentage, output to console
//--------------------------------------------
[formatter setNumberStyle:NSNumberFormatterPercentStyle];
 
// Set to the current locale
[formatter setLocale:[NSLocale currentLocale]];
 
// Get percentage of system space that is available
float percent = [[attributesDict objectForKey:NSFileSystemFreeSize] floatValue] / [[attributesDict objectForKey:NSFileSystemSize] floatValue];
NSNumber *num = [NSNumber numberWithFloat:percent];
formattedOutput = [formatter stringFromNumber:num];
NSLog(@"Percentage of system space available: %@", formattedOutput);

//--------------------------------------------
// Format style as "spell-out" output to console
//--------------------------------------------
[formatter setNumberStyle:NSNumberFormatterSpellOutStyle];
formattedOutput = [formatter stringFromNumber:[attributesDict objectForKey:NSFileSystemFreeSize]];
 
NSLog(@"Spell out: %@", formattedOutput);
 
// Clean up
[formatter release];
[locale release];

@interface testAppObject : NSObject
{
  NSString  *beerName;   // Homebrew name
  NSString  *beerStyle;  // Character and origin
  float     beerIBU;     // Bitterness range
  NSArray   *arrayHops;  // Types of hops
}

...
beerStyle = [[NSString alloc] initWithString:@"American Ale"];
beerName = [[NSString alloc] initWithString:@"Hoppy Times"];
beerIBU = 63.90;
arrayHops = [NSArray arrayWithObjects:@"Amarillo", @"Cascade", @"Centennial", @"Chinook", nil];
...

testAppObject *obj;
 
obj = [[testAppObject alloc] init];
 
NSLog(@"%@", obj);

- (NSString *)description
{
  return [NSString stringWithFormat:@"\nBeer style: %@ \nBeer name: %@\nIBUs = %3.2f
            \nCategories: %@", beerStyle, beerName, beerIBU, arrayHops];
}

// CGPoint converted to NSValue
CGPoint point = CGPointMake(9, 9);
NSValue *pointObj = [NSValue valueWithCGPoint:point];		
 
// CGSize converted to NSValue
CGSize size = CGSizeMake(100, 100);
NSValue *sizeObj = [NSValue valueWithCGSize:size];
 
// CGRect from CGPoint and CGSize converted to NSValue
CGRect rect = CGRectMake(point.x, point.y, size.width, size.height);
NSValue *rectObj = [NSValue valueWithCGRect:rect];
 
// Add the objects to a collection
NSArray *array = [NSArray arrayWithObjects:pointObj, sizeObj, rectObj, nil];
 
// Print to console the objects in the collection
NSLog(@"array content: %@", array);
 
// Restore from NSValue to C structures
CGPoint pointRestored = [pointObj CGPointValue];
CGSize sizeRestored = [sizeObj CGSizeValue];
CGRect rectRestored = [rectObj CGRectValue];
 
// Print restored values
NSLog(@"point x:%f y:%f", pointRestored.x, pointRestored.y);
NSLog(@"size  w:%f h:%f", sizeRestored.width, sizeRestored.height);
NSLog(@"rect x:%f y:%f w:%f h:%f", rectRestored.origin.x, rectRestored.origin.y, 
  rectRestored.size.width, rectRestored.size.height);

[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"];

typedef struct _NSRange 
{
  NSUInteger location;
  NSUInteger length;
} NSRange;

#if __LP64__ || TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64
typedef unsigned long NSUInteger;
#else
typedef unsigned int NSUInteger;
#endif

NSString *homebrew = @"Imperial India Pale Ale (IPA)";
 
// Starting at position 25, get 3 characters
NSRange range = NSMakeRange (25, 3);
 
// This would also work:
// NSRange range = {25, 3};
 
NSLog (@"Beer shortname: %@", [homebrew substringWithRange:range]);

NSString *homebrew = @"Imperial India Pale Ale (IPA)";
NSRange range = [homebrew rangeOfString:@"IPA"];
 
// Did we find the string "IPA" ?
if (range.length > 0)
  NSLog(@"Range is: %@", NSStringFromRange(range));

NSString *homebrew = @"Imperial India Pale Ale (IPA)";
 
// Search for the "ia" starting at the end of string
NSRange range = [homebrew rangeOfString:@"ia" options:NSBackwardsSearch];
 
// What did we find
if (range.length > 0)
  NSLog(@"Range is: %@", NSStringFromRange(range));