How, where to declare unspecified identifier? - objective-c

Question

Have the following code:
#import "UsingViewsViewController.h"
#implementation UsingViewsViewController
#synthesize pageControl;
#synthesize imageView1, imageView2;
- (void)dealloc
{
[pageControl release];
[imageView1 release];
[imageView2 release];
[super dealloc];
}
- (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.
}
#pragma mark - View lifecycle
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
// --- initialize the first imageview to display an image---
[imageView1 setImage:[UIImage imageNamed:#"iMac_old.jpeg"]];
tempImageView = imageView2;
//--- make the first imageview visible and hide the second---
[imageView1 setHidden:NO];
[imageView2 setHidden:YES];
//--- Add the event handler for the page controller ---
[pageControl addTarget:self
action:#selector(pageTurning:)
forControlEvents:UIControlEventValueChanged];
/*
UIActionSheet *action =
[[UIActionSheet alloc]
initWithTitle:#"Title of action sheet"
delegate:self
cancelButtonTitle:#"OK"
destructiveButtonTitle:#"Delete message"
otherButtonTitles:#"Option 1",#"Option 2", nil];
[action showInView:self.view];
[action release];
*/
/*
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Hello"
message:#"This is an alert view"
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:#"Option 1", #"Option 2", nil];
[alert show];
[alert release];*/
[super viewDidLoad];
}
//--- When the page controls value is changed---
- (void)pageTurning: (UIPageControl *)pageController {
//--- get the page number you can turning to ---
NSInteger nextPage = [pageController currentPage];
switch (nextPage) {
case 0:
[tempImageView setImage:
[UIImage imageNamed:#"iMac_old.jpeg"]];
break;
case 1:
[tempImageView setImage:
[UIImage imageNamed:#"iMac.jpeg"]];
break;
case 2:
[tempImageView setImage:
[UIImage imageNamed:#"Mac8100.jpeg"]];
break;
case 3:
[tempImageView setImage:
[UIImage imageNamed:#"MacPlus.jpeg"]];
break;
case 4:
[tempImageView setImage:
[UIImage imageNamed:#"MacSE.jpeg"]];
break;
default:
break;
}
//--- Switch the two imageviews---
if (tempImageView.tag==0) {
//--- imageView1---
tempImageView = imageView2;
bgImageView = imageView1;
}
else {
//---imageView2---
tempImageView = imageView1;
bgImageView = imageView2;
}
//---animate the two views flipping---
[UIView beginAnimations:#"flipping view"
context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:tempImageView];
cache:YES];
[tempImageView setHidden:YES];
[UIView commitAnimations];
[UIView beginAnimations:#"flipping view"
context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:tempImageView];
cache:YES];
[bgImageView setHidden:NO];
[UIView commitAnimations];
}
/*
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSLog(#"%d", buttonIndex);
}
*/
/*
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
NSLog(#"%d", buttonIndex);
}
*/
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end
My problem is that Xcode is telling me that tempImageView is an unspecified identifier and won't compile.
Does it need to be declared as a variable? If so, where should I declare it, and what type should it be? Does it need to be declared in the header file too?
Thanks in advance.

Answer 1

you need to declare that variable.
In your .h file add:
(in your interfase)
UIImageView *tempImageView;
then in your .m file edit this line: #synthesize imageView1, imageView2;
change it to: #synthesize imageView1, imageView2, tempImageView ;
Hope it helps!
UPDATE
Forgot memory related stuff.. Add in your - (void)dealloc:
[imageView2 release];
[tempImageView release]; //ADD THIS LINE
[super dealloc];
UPDATE
Do the same with bgImageView
In your .h file add:
(in your interfase)
UIImageView *bgImageView;
then in your .m file edit this line: #synthesize imageView1, imageView2, tempImageView;
change it to: #synthesize imageView1, imageView2, tempImageView, bgImageView;
Add in your - (void)dealloc:
[imageView2 release];
[tempImageView release];
[bgImageView release]; //ADD THIS LINE
[super dealloc];