mundstein

@implementation NSObject (PerformBlockAfterDelay)

- (void)performBlock:(void (^)(void))block 
          afterDelay:(NSTimeInterval)delay 
{
    block = [[block copy] autorelease];
    [self performSelector:@selector(fireBlockAfterDelay:) 
               withObject:block 
               afterDelay:delay];
}

mundstein

-(NSDate *) lastMondayBeforeDate:(NSDate*)timeStamp {
   NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
   NSDateComponents *comps = 
      [gregorian components:NSWeekdayCalendarUnit fromDate:timeStamp];
   NSInteger weekday = [comps weekday];
   weekday = weekday==1 ? 6 : weekday-2; // start with 0 on Monday rather than 1 on Sunday
   NSTimeInterval secondsSinceMondayMidnight =  
     (NSUInteger) [timeStamp timeIntervalSince1970] % 60*60*24 + 
      weekday * 60*60*24;
   return [timeStamp dateByAddingTimeInterval:-secondsSinceMondayMidnight];

mundstein

// override this method to get a great log output
// to show how the view is resized when rotating,
// calling sizeToFit and other methods that affect the frame

- (void) setFrame:(CGRect)frame {
    [super setFrame:frame];
    NSLog(@"%@ - %@", NSStringFromSelector(_cmd), NSStringFromCGRect(frame));
}

mundstein

// Make a picture browser, just like in the Photo app 
// **With only six additional lines of code!**


// in viewDidLoad:

self.tableView.transform = CGAffineTransformMakeRotation(-M_PI/2);  // turn the table 90° anti-clockwise
self.tableView.showsVerticalScrollIndicator = NO;
self.tableView.pagingEnabled = YES;

mundstein

// Override this method in any class to get a pretty list of 
// all methods that are being called - very useful.
// Try it on the AppDelegate for example

-(BOOL)respondsToSelector:(SEL)aSelector {
    printf("The spy says: %s\n", [NSStringFromSelector(aSelector) UTF8String]);
    return [super respondsToSelector:(aSelector)];
}