Notes of a Developer

Many people could not find this solution! It’s really very simple solution and it does not contain any private methods and functions. It’s based on the drawRect method and the simple manipulation with the title. If the title is specified, then the text of title displays, but if not, then displays the [...]

Presented simple and nice solution for radio buttons, based on the UIButton.
Add buttons on view of controller
for (int i = 0; i < 5; i++) {
        UIButton *but = [UIButton buttonWithType:UIButtonTypeCustom];
        [but setImage:[UIImage imageNamed:@"checkbox.png"] forState:UIControlStateNormal];
        [but setImage:[UIImage imageNamed:@"checkedbox.png"] forState:UIControlStateSelected];
        [but setFrame:CGRectMake(0, 0, 17, [...]

ToolbarSearch
This sample shows how to use a search field in a toolbar. When you start a search, a table view displaying recent searches matching the current search string is displayed in a popover.
New controller:
UIPopoverControllerDelegate

Create a navigation controller to contain the recent searches controller, and create the popover controller to contain the navigation controller.
UINavigationController *navigationController [...]

Change RGB color of the picture
- (UIImage *) changeColor: (UIImage *)image {
    UIGraphicsBeginImageContext(image.size);
   
    CGRect contextRect;
    contextRect.origin.x = 0.0f;
    contextRect.origin.y = 0.0f;
    contextRect.size = [image size];
    // Retrieve source image and begin image context
    CGSize itemImageSize = [image size];
    CGPoint itemImagePosition;
    itemImagePosition.x = ceilf((contextRect.size.width [...]

Solution for change orientation with uitabbar and others exeptions.
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didOrientation:) name:@"UIDeviceOrientationDidChangeNotification" object:nil];

And method
- (void) didOrientation: (id)object {
   
    UIInterfaceOrientation interfaceOrientation = [[object object] orientation];
 
    if (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
   
        self.view.transform = CGAffineTransformMakeRotation(0);
    } [...]

Developing for the iPhone, we wanted to show a volume control that sync’ed with the user’s volume control buttons on the side of the phone. It turns out, the best way to do this is to show the volume control using the MPVolumeView class (part of the MediaPlayer framework).
MPVolumeView *volumeView = [[[MPVolumeView alloc] initWithFrame:
  [...]

Here is a bare bones hello world-style example that demonstrates library access and music playback. In a few minutes you can have a working, if minimal, music player. Lacking a user interface, this code queues up the entire iPod library and starts playing immediately on launch.
Note: To follow these steps you’ll need a provisioned device [...]

Make image with a mask!

Source:
- (UIImage*) maskImage:(UIImage *)image  {
   
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
   
    UIImage *maskImage = [UIImage imageNamed:@"mask.png"];
    CGImageRef maskImageRef = [maskImage CGImage];
   
    // create a bitmap graphics context the size of the image
    CGContextRef mainViewContentContext = CGBitmapContextCreate (NULL, maskImage.size.width, maskImage.size.height, 8, 0, [...]