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// Resize a UIButton according to its title's length.
CGSize stringSize = [self.myButton.titleLabel.text sizeWithFont:self.myButton.titleLabel.font];
CGRect frame = self.myButton.frame;
frame.size.width = stringSize.width;
[self.myButton setFrame:frame];

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// Displaying a right bar info button item
UIButton *btn = [UIButton buttonWithType:UIButtonTypeInfoDark];
[btn addTarget:self action:@selector(doSomeAction:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *bbi = [[UIBarButtonItem alloc] initWithCustomView:btn];
self.navigationItem.rightBarButtonItem = bbi;
[bbi release];

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// Display a right bar Close button item 
UIBarButtonItem *bbi = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(doClose:)];    
self.navigationItem.rightBarButtonItem = bbi;
[bbi release];

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// Horizontal flip transition of a modal view
MyViewController *av = [[[MyViewController alloc] init] autorelease];
[av setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[av setModalPresentationStyle:UIModalPresentationCurrentContext];
[self presentModalViewController:av animated:YES];
[av release];

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//
//  SomeViewController.m
//
- (IBAction)doShowSomething:(id)sender
{
    UINavigationController *nav = [[[UINavigationController alloc]init] autorelease];
    MyViewController *av = [[[MyViewController alloc] init] autorelease];

    [nav pushViewController:av animated:NO];
    

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dispatch_async(dispatch_get_main_queue(), ^{ 
    /* your code */ 
});

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cell.selectedBackgroundView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
cell.selectedBackgroundView.backgroundColor = <your color>;

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cell.textLabel.highlightedTextColor = <your color>;

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// Example for UIControlStateNormal
[yourbutton setTitleColor:<your color> forState:UIControlStateNormal];

// Example for UIControlStateHighlighted
[yourbutton setTitleColor:<your color> forState:UIControlStateHighlighted];

// And so on...

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// Trimming white spaces and new line characters from a NSString
NSString *s = @"  hellow world.  ";
NSString *trimmedString= [s stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];