Rotating an image with bounds & unchanged ratio

- (void)scaleAndRotateImage:(UIImage *)image
{
int kMaxResolution = 320; // Or whatever

CGImageRef imgRef = image.CGImage;

CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);

CGAffineTransform transform = CGAffineTransformIdentity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = bounds.size.width / ratio;
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = bounds.size.height * ratio;
}
}

CGFloat scaleRatio = bounds.size.width / width;
CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
CGFloat boundHeight;
UIImageOrientation orient = image.imageOrientation;
switch(orient) {

case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;

case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;

case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;

case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;

case UIImageOrientationLeftMirrored: //EXIF = 5
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;

case UIImageOrientationLeft: //EXIF = 6
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;

case UIImageOrientationRightMirrored: //EXIF = 7
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;

case UIImageOrientationRight: //EXIF = 8
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;

default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];

}

UIGraphicsBeginImageContext(bounds.size);

CGContextRef context = UIGraphicsGetCurrentContext();

if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
}
else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}

CGContextConcatCTM(context, transform);

CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[self setRotatedImage:imageCopy];
//return imageCopy;
}

Simple drawing through touches

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

mouseSwiped = NO;
UITouch *touch = [touches anyObject];

if ([touch tapCount] == 2) {
drawImage.image = nil;
return;
}

lastPoint = [touch locationInView:self.view];
lastPoint.y -= 20;

}


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;

UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y -= 20;


UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

lastPoint = currentPoint;

}



- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

UITouch *touch = [touches anyObject];

if ([touch tapCount] == 2) {
drawImage.image = nil;
return;
}


if(!mouseSwiped) {
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}

How to capture current screen through the app

-(IBAction)captureScreen:(id)sender
{
UIGraphicsBeginImageContext(webview.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
}

Selecting Photo from photo library through image picker

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{

appDelegate.image = image;
[picker dismissModalViewControllerAnimated:YES];
}

Picking Image from camera or photo library

-(IBAction) camAction
{
if([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeCamera]){
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
//picker.allowsImageEditing = YES;
picker.editing=YES;
[self presentModalViewController:picker animated:YES];
[picker release];
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"This device does not have any camera."
delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
[alert release];
}
}


-(IBAction) libraryAction
{
if([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypePhotoLibrary]){
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
//picker.allowsImageEditing = YES;
picker.editing=YES;
[self presentModalViewController:picker animated:YES];
[picker release];
}
}

Choosing Image through Action Sheet

-(IBAction)choosePictureButtonPressed
{


UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:nil
delegate:self
cancelButtonTitle:@"Cancel"
destructiveButtonTitle:nil
otherButtonTitles:@"From Album",@"Camera",nil];

actionSheet.actionSheetStyle = UIActionSheetStyleDefault;
actionSheet.cancelButtonIndex=2;
[actionSheet showInView:self.view];
[actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
[actionSheet release];
}

-(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{

if(buttonIndex==0)
{
[self libraryAction];//:YES];
}
else if(buttonIndex == 1)
{
[self camAction];//:YES];
}
}

Photo Uploading in a web server through iPhone

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{
[picker dismissModalViewControllerAnimated:YES];
[picker dismissModalViewControllerAnimated:YES];
NSLog(@"image have been choosed");
CGRect newSize = CGRectMake(0, 0, 270.0f, 360.0f);
UIGraphicsBeginImageContext(newSize.size);
[image drawInRect:newSize];
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
imageViewer.image = [imageCopy retain];
}



// post button's action

-(IBAction)postImage
{
NSInteger tmp = [[[NSUserDefaults standardUserDefaults] valueForKey:@"imageNameCount"] intValue];
tmp++;
[[NSUserDefaults standardUserDefaults] setValue:[NSString stringWithFormat:@"%d",tmp] forKey:@"imageNameCount"];
NSString *filename = [NSString stringWithFormat:@"myPhoto%@.jpg",[[NSUserDefaults standardUserDefaults] valueForKey:@"imageNameCount"]];
NSData *tmpData = UIImageJPEGRepresentation(imageViewer.image, 50);
[self uploadImage:tmpData filename:filename];
}


- (BOOL)uploadImage:(NSData *)imageData filename:(NSString *)filename{


NSString *urlString = @"http://test.prologsites.com/nc/upload_now.php";

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@\"\r\n",filename]] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(returnString);
return ([returnString isEqualToString:@"OK"]);
}


// run the camera application

-(IBAction) camAction:(id)sender
{
if([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypePhotoLibrary]){
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
picker.editing=YES;
[self presentModalViewController:picker animated:YES];
[picker release];
}
}



// view the library to select photo

-(IBAction) libraryAction:(id)sender
{
if([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypePhotoLibrary]){
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
picker.editing=YES;
[self presentModalViewController:picker animated:YES];
[picker release];
}
}

Playing audio in iPhone

We can play audio files in the same way we played the video. The only difference is the file extensions. We just need to change extension of the file. That's it.

Playing video in iPhone

#import "PlayVideoViewController.h"
#import "MediaPlayer/MediaPlayer.h"

@implementation PlayVideoViewController



- (void)viewDidLoad
{

NSString *url = [[NSBundle mainBundle]
pathForResource:@"Miracle"
ofType:@"mp4"];

MPMoviePlayerController *player =
[[MPMoviePlayerController alloc]
initWithContentURL:[NSURL fileURLWithPath:url]];

[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(movieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:player];

//---play movie---
[player play];

// Changing the orientation
// [player setOrientation:UIDeviceOrientationPortrait animated:NO];
[super viewDidLoad];
}



- (void) movieFinishedCallback:(NSNotification*) aNotification {
MPMoviePlayerController *player = [aNotification object];
[[NSNotificationCenter defaultCenter]
removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:player];
[player autorelease];
}
@end

Sending email through iPhone

-(IBAction)sendButtonPressed
{
[self sendEmailTo:txtTo.text withSubject:txtSubject.text withBody:txtBody.text];
}

-(void)sendEmailTo:(NSString *)to withSubject:(NSString *)subject withBody:(NSString *)body
{
NSString *mailString = [NSString stringWithFormat:@"mailto:?to=%@&subject=%@&body=%@",
[to stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
[subject stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
[body stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:mailString]];

UIAlertView *myAlert=[[UIAlertView alloc] initWithTitle:@"Success" message:@"Email sent" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[myAlert show];
[myAlert release];
}

Welcome Note

It's just been created. I'll post my essential codes later on.