eric e. dolecki

Interactive Technologist and Designer

I just wanted to update my previous post in regards to an iPhone application that allows one to step through images as a presentation to a potential/current client, etc. So all I've really done here is added swiping left and right with a small allowance for vertical changes.

#import "ClickThroughViewController.h"
#import <QuartzCore/QuartzCore.h>

@implementation ClickThroughViewController
@synthesize imageView, imageViewTop, aboutView, aboutButton, 
   advanceButton, backButton, label, gestureStartPoint, dirString;

- (void)updateLabel {
 NSString *c = [[NSString alloc] initWithFormat:@"%i", count];
 label.text = c;
 [c release];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
 UITouch *touch = [touches anyObject];
 gestureStartPoint = [touch locationInView:self.view];
 dirString = NULL;
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
 UITouch *touch = [touches anyObject];
 CGPoint currentPosition = [touch locationInView:self.view];
 if(fabsf(gestureStartPoint.x - currentPosition.x ) >= kMinimumGestureLength && fabsf(gestureStartPoint.y - currentPosition.y) <= kMaximumVariance){
  //Horizontal Swipe
  if( gestureStartPoint.x < currentPosition.x ){
   dirString = @"fromLeft";
  } else {
   dirString = @"fromRight";
  }
 }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
 if( [dirString isEqualToString:@"fromLeft"] ){
  [self prevImage];
 } else if( [dirString isEqualToString:@"fromRight"]){
  [self nextImage];
 }
}

/*
 You need to make sure the prototype images that you use are JPGs
 and use the "image_" convention, otherwise the total count will
 be off and your application will bork.
*/
- (void)viewDidLoad {
 
 UIImage *img = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"image_1.jpg" ofType:nil]];
 UIImage *img2 = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"image_1.jpg" ofType:nil]];
 imageView.image = img2;
 imageViewTop.image = img;
 imageView.hidden = YES;
 totalCount = 0;
 aboutShowing = NO;
 
 NSArray *d = [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil];
 for(NSString *s in d){
  if([[s lastPathComponent] hasPrefix:@"image_"]){
   totalCount++;
  }
 }
 count = 1;
 prev = totalCount;
 label.alpha = 0;
 
 [self updateLabel];
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; 
}

- (void)dealloc {
 [imageView release];
 [backButton release];
 [advanceButton release];
    [super dealloc];
}

// #pragma isn't very cool in my opinion, so...
//MARK: Custom Code

- (IBAction)advanceImage:(id)sender {
 [self nextImage];
}

- (void)nextImage {
 count++;
 if( count > totalCount ){
  count = 1;
 }
 if( count == 1 ){
  prev = totalCount;
 } else {
  prev = count - 1;
 }
 [self updateLabel];
 
 NSString *tmp = [[NSString alloc] initWithFormat:@"image_%i", count];
 NSString *old = [[NSString alloc] initWithFormat:@"image_%i", prev];
 UIImage *img = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:tmp ofType:@"jpg"]];
 UIImage *img2 = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:old ofType:@"jpg"]];
 
 imageView.image = img2;
 imageViewTop.image = img;
 label.alpha = 1;
 
 CGContextRef context = UIGraphicsGetCurrentContext();
 [UIView beginAnimations:nil context:context];
 [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:[self imageViewTop] cache:YES];
 [UIView setAnimationDuration:0.5];
 [UIView commitAnimations];
 
 CGContextRef context2 = UIGraphicsGetCurrentContext();
 [UIView beginAnimations:nil context:context2];
 [UIView setAnimationDuration:1.0];
 label.alpha = 0;
 [UIView commitAnimations];
}

- (IBAction)aboutChange:(id)sender {
 if( !aboutShowing ){
  aboutShowing = YES;
  aboutView.hidden = NO;
  aboutView.frame = CGRectMake(0, -50, 320, 480);
  aboutView.alpha = 0.0;
  CGContextRef context = UIGraphicsGetCurrentContext();
  [UIView beginAnimations:nil context:context];
  [UIView setAnimationDuration:1.0];
  aboutView.frame = CGRectMake(0, 0, 320, 480);
  aboutView.alpha = 1.0;
  [UIView commitAnimations];

 } else {
  aboutShowing = NO;  
  CGContextRef context2 = UIGraphicsGetCurrentContext();
  [UIView beginAnimations:nil context:context2];
  [UIView setAnimationDuration:1.0];
  aboutView.frame = CGRectMake(0, -50, 320, 480);
  aboutView.alpha = 0.0;
  [UIView commitAnimations];
 }
}

- (IBAction)backImage:(id)sender {
 [self prevImage];
}

- (void)prevImage {
 count--;
 if( count < 1 ){
  count = totalCount;
 }
 if( count == 1 ){
  prev = totalCount;
 } else {
  prev = count + 1;
 }
 [self updateLabel];
 NSString *tmp = [[NSString alloc] initWithFormat:@"image_%i", count];
 NSString *old = [[NSString alloc] initWithFormat:@"image_%i", prev];
 UIImage *img = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:tmp ofType:@"jpg"]];
 UIImage *img2 = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:old ofType:@"jpg"]];
 imageView.image = img2;
 imageViewTop.image = img;
 label.alpha = 1;
 
 CGContextRef context = UIGraphicsGetCurrentContext();
 [UIView beginAnimations:nil context:context];
 [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:[self imageViewTop] cache:YES];
 [UIView setAnimationDuration:0.5];
 [UIView commitAnimations];
 
 CGContextRef context2 = UIGraphicsGetCurrentContext();
 [UIView beginAnimations:nil context:context2];
 [UIView setAnimationDuration:1.0];
 label.alpha = 0;
 [UIView commitAnimations];
}

@end

Labels: iPhone, Objective-C

 

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