Switch image to full screen on ipad - ipad

Question

I have a lot of trouble to accomplish this task on an ipad : when double tape on an image switch this image to full screen and when double taping again come back to the original display, same thing using pinching. I'm using UIGestureRecognizer to try to do this. Thanks for your help.
GesturesViewController.h
#import <UIKit/UIKit.h>
#interface GesturesViewController : UIViewController
<UIActionSheetDelegate>{
IBOutlet UIImageView *imageView;
}
#property (nonatomic, retain) UIImageView *imageView;
#end
GesturesViewController.m
#import "GesturesViewController.h"
#import "GesturesAppDelegate.h"
#implementation GesturesViewController
#synthesize imageView;
CGRect originalFrame,fullScreenFrame;
BOOL isFullScreenMode;
- (void)viewDidLoad {
// Loading test image
imageView.image = [UIImage imageNamed:#"image1.jpg"];
//---tap gesture---
isFullScreenMode = NO;
originalFrame = CGRectMake(imageView.frame.origin.x,imageView.frame.origin.y,imageView.frame.size.width,imageView.frame.size.height);
//changes
fullScreenFrame = CGRectMake(0,0,768,1004);
UITapGestureRecognizer *tapGesture =
[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
tapGesture.numberOfTapsRequired = 2;
[imageView addGestureRecognizer:tapGesture];
[tapGesture release];
//---pinch gesture---
UIPinchGestureRecognizer *pinchGesture =
[[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(handlePinchGesture:)];
[imageView addGestureRecognizer:pinchGesture];
[pinchGesture release];
[super viewDidLoad];
}
//---handle tap gesture---
-(IBAction) handleTapGesture:(UIGestureRecognizer *) sender {
// HOW TO ACCOMPLISH THIS PART
if (isFullScreenMode)
[imageView setFrame:originalFrame];
else
[imageView setFrame:fullScreenFrame];
[imageView setCenter:CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2)];
isFullScreenMode = !isFullScreenMode;
NSLog(#"Image View : %#",imageView);
}
//---handle pinch gesture---
-(IBAction) handlePinchGesture:(UIGestureRecognizer *) sender {
CGFloat factor = [(UIPinchGestureRecognizer *) sender scale];
if (sender.state == UIGestureRecognizerStateEnded){
// HOW TO ACCOMPLISH THIS ---
if (factor > 1 && !isFullScreenMode) {
//---pinching in---
[imageView setFrame:fullScreenFrame];
} else {
//---pinching out---
[imageView setFrame:originalFrame];
}
isFullScreenMode = !isFullScreenMode;
[imageView setCenter:CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2)];
}
NSLog(#"Image View : %#",imageView);
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[images release];
[imageView release];
[super dealloc];
}
#end
Thanks.

Answer 1

- (void)toggleZoom:(UITapGestureRecognizer *)gestureRecognizer
{
if (proxyView)
{
CGRect frame =
[proxyView.superview
convertRect:self.view.frame
fromView:self.view.window];
self.view.frame = frame;
CGRect proxyViewFrame = proxyView.frame;
[proxyView.superview addSubview:self.view];
[proxyView removeFromSuperview];
[proxyView autorelease];
proxyView = nil;
self.view.frame = proxyViewFrame;
}
else
{
proxyView = [[UIView alloc] initWithFrame:self.view.frame];
proxyView.hidden = YES;
proxyView.autoresizingMask = self.view.autoresizingMask;
[self.view.superview addSubview:proxyView];
CGRect frame =
[self.view.window
convertRect:self.view.frame
fromView:proxyView.superview];
[self.view.window addSubview:self.view];
self.view.frame = frame;
self.view.frame = self.view.window.bounds;
}
}
I have selected only necessary portion of the code...... its from ZoomingViewController....
If you see its same as we have discussed earlier..... but with few improvements.......

Answer 2

For doing this you have to first store your original frame size somewhere globally so that you can reassing it later on.
you need create two global frames
CGRect originalFrame, fullScreenFrame;
//in viewDidLoad initialize these frames... originalFrame with imageView frame and
fullScreenFrame with the iPad window coordinates........ but remeber this can distort the
aspect ratio so just calculate the aspect ratio of original image by using its height and
width and accordingly create the full screen frame for the image.......
and just assign these frames in your gesture action.
Thanks,

Answer 3

in
viewDidLoad
originalFrame = imageView.frame;
or
originalFrame = CGRectMake(imageView.frame.origin.x,imageView.frame.origin.y,imageView.frame.size.width,imageView.frame.size.height);
appDelegate <----- get the instance of your appdelegate object so that we can retrieve the window object.......
UIWindow *tempWindow = [appDelegate window];
fullScreenFrame = CGRectMake(tempWindow .frame.origin.x,tempWindow .frame.origin.y,tempWindow .frame.size.width,tempWindow.frame.size.height);
//**in event just set frame of the imageView-- for knowing the current state-- whether its fullScreen or original frame we need to have a flag........it should be global...
so declare a global flag ....BOOL isFullScreenMode and initialize it as NO in
viewDidLoad
isFullScreenMode = NO;
in gesture actions just check this flag and write following...
if (isFullScreenMode)
[imageView setFrame:originalFrame];
else
[imageView setFrame:fullScreenFrame];
isFullScreenMode = !isFullScreenMode;

Answer 4

#implementation ImageFullScreen
#synthesize myImage;
#import "GesturesViewController.h"
#import "GesturesAppDelegate.h"
#implementation GesturesViewController
#synthesize imageView;
CGRect originalFrame,fullScreenFrame;
BOOL isFullScreenMode;
- (void)viewDidLoad {
// Loading test image
imageView.image = [UIImage imageNamed:#"image1.jpg"];
//---tap gesture---
isFullScreenMode = NO;
originalFrame = CGRectMake(imageView.frame.origin.x,imageView.frame.origin.y,imageView.frame.size.width,imageView.frame.size.height);
//changes
fullScreenFrame = CGRectMake(0,0,768,1004);
UITapGestureRecognizer *tapGesture =
[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
tapGesture.numberOfTapsRequired = 2;
[imageView addGestureRecognizer:tapGesture];
[tapGesture release];
//---pinch gesture---
UIPinchGestureRecognizer *pinchGesture =
[[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(handlePinchGesture:)];
[imageView addGestureRecognizer:pinchGesture];
[pinchGesture release];
[super viewDidLoad];
}
//---handle tap gesture---
-(IBAction) handleTapGesture:(UIGestureRecognizer *) sender {
// HOW TO ACCOMPLISH THIS PART
if (isFullScreenMode)
[imageView setFrame:originalFrame];
else
[imageView setFrame:fullScreenFrame];
[imageView setCenter:CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2)];
isFullScreenMode = !isFullScreenMode;
NSLog(#"Image View : %#",imageView);
}
//---handle pinch gesture---
-(IBAction) handlePinchGesture:(UIGestureRecognizer *) sender {
CGFloat factor = [(UIPinchGestureRecognizer *) sender scale];
if (sender.state == UIGestureRecognizerStateEnded){
// HOW TO ACCOMPLISH THIS ---
if (factor > 1 && !isFullScreenMode) {
//---pinching in---
[imageView setFrame:fullScreenFrame];
} else {
//---pinching out---
[imageView setFrame:originalFrame];
}
isFullScreenMode = !isFullScreenMode;
[imageView setCenter:CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2)];
}
NSLog(#"Image View : %#",imageView);
}