hi i am new to iphone application. i am doing an application that consist of image picker and image view. i am displaying the image in imageview by selecting the image in image picker .. what i need is afetr 3 seconds i have to go back imagepicker how can i done this please give code for that
You want to create an NSTimer object.
NSTimer *theTimer = [NSTimer scheduledTimerWithTimeInterval:3.0
target:self
selector:#selector(pictureTimerFired:)
userInfo:nil
repeats:NO];
Where the target selector has a signature like:
- (void) pictureTimerFired:(NSTimer*)theTimer {
NSLog(#"Timer fired, closing picture");
}
You would remove the imageView in the opposite way you added it. i.e. it depends if it was added as a modal view or subview etc.
Related
I am trying to get two images to display, one right after the other; after the user pushes “START”. The first image will display for 3 seconds and then the second image will display right afterward. Each image is set to pause for 3 seconds. It complies okay for (3G 4.2.1) simulator runs on simulator when either of the images is commented out, but hangs on the first image when coded as follows:
//this method gets called when the start button is pressed
-(IBAction) start {
[self.navigationController pushViewController:self.**halfSplashController** animated:YES];
[self.navigationController pushViewController:self.**halfSplash2Controller** animated:YES];
}
Is there a command I need to insert between the two or should it display the first image and then go on to the second image as I envision?
I think you should use NSTimer for the delay of 3 seconds. Try Following Code
-(IBAction) start
{
[self.navigationController pushViewController:self.**halfSplashController** animated:YES];
[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:#selector(theActionMethod) userInfo:nil repeats:NO];
[currentTimer fire];
}
- (void)theActionMethod
{
[self.navigationController pushViewController:self.**halfSplash2Controller** animated:YES];
}
It will change the image after 3 seconds.If you want to repeatedly change the image then change repeats to YES in NSTimer initialization.And also change the code in theActionMethod() function.
You can also use the method [self performSelector: afterDelay] and it should work the way you want
What I am trying to achieve is showing a view during a couple of seconds without user intervention. Is the same effect as the ringer volume view that appears when pressing the volume controls on iphone:
I have a scroll view with an image, taping in the image, sound begin to play, another tap and it pauses. I would like to implement the above effect just to inform of the action (showing a play/pause images).
I hope that I have explained the problem perfectly.
Many thanks for your help.
Regards
Javi
Assume you have some class inherited from UIViewController. You can use the code below:
const int myViewTag = 10001;
const int myInterval = 1; // define the time you want your view to be visible
- (void)someAction {
//this could be your `IBAction` implementation
[self showMyView];
[NSTimer scheduledTimerWithTimeInterval:myInterval
target:self
selector:#selector(hideMyView)
userInfo:nil
repeats:NO];
}
- (void) showMyView {
//you can also use here a view that was declared as instance var
UIView *myView = [[[UIView alloc] initWithFrame:CGRectMake(100, 100, 120, 120)] autorelease];
myView.tag = myViewTag;
[self.view addSubview:myView];
}
- (void) hideMyView {
//this is a selector that called automatically after time interval finished
[[self.view viewWithTag:myViewTag] removeFromSuperview];
}
You can also add some animations here but this is another question :)
I have 4 images. I want to load image in first screen and change images after every 10 second. when we click any images than next screen come up.
please give me help i am new in iPhone.
Use NSTimer to trigger the image change. If the user taps an image and you want to stop the image rotation, you can invalidate the timer before switching to the next view.
You can try by creating a method that changes the image in the imageView and calling it using a NSTimer which repeatedly calls the method every 10 seconds.
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10.0 target:self selector:#selector(changeImage) userInfo:nil repeats:YES];
- (void)changeImage {
// Change image here
}
HI Avinash,
I think you need below code...
******* IN VIEW DID LOAD
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10.0 target:self selector:#selector(changeImage) userInfo:nil repeats:YES];
- (void)changeImage {
[self.imgview setImage:[UIImage imageNamed:#"test.png"]];
}
Thx
I have a button in my app that when pressed goes to a view
but I need that when pressed for 3 seconds it would go to a different view,
like when you are on ipad on safari and you keep pressed the url, and it shows a pop up with copy etc,
but I need that when pressed for 3 second it goes to another view...
hope this makes sense, I will explain better if not understood,
thank you so much!
pd, also how to make it show the pop up style window?
cheers!
Try setting an NSTimer property in your view controller. When the button's pressed, create the timer and assign it to your property. You can detect that moment with this:
[button addTarget:self action:#selector(startHoldTimer) forControlEvents:UIControlEventTouchDown];
and assign with this:
-(void) startHoldTimer {
self.myTimer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:#selector(goToNewView:) userInfo:nil repeats:NO];
}
Then set an action to run on a canceled touch, or a touch up inside:
[button addTarget:self action:#selector(touchUp) forControlEvents:UIControlEventTouchUpInside];
[button addTarget:self action:#selector(cancelTimer) forControlEvents:UIControlEventTouchCancel];
and
//if timer fires, this method gets called
-(void) goToNewView {
[self cancelTimer];
[self loadSecondView];
}
// normal button press invalidates the timer, and loads the first view
-(void) touchUp {
[self cancelTimer];
[self loadFirstView];
}
//protected, just in case self.myTimer wasn't assigned
-(void) cancelTimer {
if (self.myTimer != nil)
if ([self.myTimer isValid]) {
[self.myTimer invalidate];
}
}
That should take care of it!
Use a UILongPressGestureRecognizer, added to the button with -addGestureRecognizer:—it'll handle timing the touch and fire an event when it recognizes that the button's been held down for a while. You might want to reconsider your interaction pattern, though—generally, things that can be long-pressed aren't buttons, they're actual pieces of data in a view, like an image or a link in Safari.
One possible approach would be to implement one of the touches events (I don't remember the name, but the method that fires when you touch down on the button), and schedule a timer to fire in three seconds. If the user lifts her finger before that time, cancel the timer and perform the normal button click. If the time does fire (i.e. 3 seconds have elapsed), ignore the touch up event and load your new view.
I want to have a custom loading menu made from a series of stills, that loops 3 times and then reveals a picture. Currently the picture is visible from the start. I want to use isAnimating to find out when the loading animation has stopped, and either change myImage.hidden off, or have the UIImageView initially containing a white image, then being replaced with the picture when isAnimating returns NO.
Apple's website just says
- (BOOL)isAnimating
and that it returns a Boolean YES or NO.
but how do you use this?
I need things to happen depending on whether something is animating or not, so i do i put the result it returns in a variable and check that in the conditional of an if statement?
put it in an if statement itself?
or is it a while statement?
or is it like:
- (BOOL)isAnimating{
//stuff to do if it is
}
or am i just getting the whole concept entirely wrong?
I guess isAnimating method just tells you if an UIViewImage is actually performing an animation.
Since you just want to create a short loading before displaying your image, why don't you simply use a timer?
You can do something like this
- (void)startAnimation {
yourImageView.hidden = YES; // Keep you image hidden while loading
[yourLoadingAnimation startAnimating]; // Start you loading animation
NSInteger timeout = 2; // Duration in seconds of your loading animation
[NSTimer scheduledTimerWithTimeInterval:timeout target:self selector:#selector(stopAnimation) userInfo:nil repeats:NO]; // Set the timer
}
- (void)stopAnimation {
[yourLoadingAnimation stopAnimating]; // Stop your loading animation
yourLoadingAnimation.hidden = YES; // Hide your laading animation
yourImageView.hidden = NO; // Display your image
}