Stop animation

UIView *viewBeingAnimated = //your view that is being animated
viewBeingAnimated.frame = [[viewBeingAnimated.layer presentationLayer] frame];
[viewBeingAnimated.layer removeAllAnimations];



another way

Another option is to set the image property as well as the animationImages property. Doing this will display the static image when the UIImageView has its animations stopped.

Assuming your class is a subclass of UIImageView and have an NSMutableArray of images, do the following:

self.animationImages = images;
//yes, I'm skipping the step to check and make sure you have at least one
//element in your array
self.image = [images objectAtIndex: 0];

save screen image of iphone

 CGRect myRect = [myView bounds];
  UIGraphicsBeginImageContext(myRect.size);

  CGContextRef ctx = UIGraphicsGetCurrentContext();
  [[UIColor blackColor] set];
  CGContextFillRect(ctx, myRect);

  [myView.layer renderInContext:ctx];

  UIImage *image1 = UIGraphicsGetImageFromCurrentImageContext();

  // Replace the following line with code that emails the image
  UIImageWriteToSavedPhotosAlbum(image1, nil, nil, nil);
  UIGraphicsEndImageContext();

Sample login in iphone

http://www.riccomini.name/Topics/Mobile/iPhone/SimpleLoginScreen/

NsTimer

1) scheduled timer & using selector

NSTimer *t = [NSTimer scheduledTimerWithTimeInterval: 2.0

                      target: self
                      selector:@selector(onTick:)
                      userInfo: nil repeats:NO];

if you set repeats to NO, the timer will wait 2 seconds before running the selector and after that it will stop;
if repeat: YES, the timer will start immediatelly and will repeat calling the selector every 2 seconds;
to stop the timer you call the timer's -invalidate method: [t invalidate];
As a side note, instead of using a timer that doesn't repeat and calls the selector after a specified interval, you could use a simple statement like this:

[self performSelector:@selector(onTick:) withObject:nil afterDelay:2.0];

this will have the same effect as the sample code above; but if you want to call the selector every nth time, you use the timer with repeats:YES

2) self-scheduled timer
   NSDate *d = [NSDate dateWithTimeIntervalSinceNow: 60.0];

NSTimer *t = [[NSTimer alloc] initWithFireDate: d
                              interval: 1
                              target: self
                              selector:@selector(onTick:)
                              userInfo:nil repeats:YES];

NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer:t forMode: NSDefaultRunLoopMode];
[t release];

• this will create a timer that will start itself on a custom date specified by you (in this case, after a minute), and repeats itself every one second 

 

3) unscheduled timer & using invocation

NSMethodSignature *sgn = [self methodSignatureForSelector:@selector(onTick:)];
NSInvocation *inv = [NSInvocation invocationWithMethodSignature: sgn];
[inv setTarget: self];
[inv setSelector:@selector(onTick:)];

NSTimer *t = [NSTimer timerWithTimeInterval: 1.0
                      invocation:inv
                      repeats:YES];

and after that, you start the timer manually whenever you need like this:

NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer: t forMode: NSDefaultRunLoopMode];

And as a note, onTick: method looks like this:

-(void)onTick:(NSTimer *)timer {
   //do smth
}