I have about 9 images on the scrollView, i want to make it autoscrolling image by image(like first image scroll to second and ..till the last one). I did something like this:
timer = [NSTimer scheduledTimerWithTimeInterval:.0 target:self selector:#selector(scrolling) userInfo:nil repeats:NO];
- (void)scrolling{
CGFloat currentOffset = scrollView.contentOffset.x;
if(currentOffset < 2236){
CGFloat newOffset = currentOffset + 172;
[UIScrollView beginAnimations:nil context:NULL];
[UIScrollView setAnimationDuration:2.1];
[scrollView setContentOffset:CGPointMake(newOffset,0.0) animated:YES];
[UIScrollView commitAnimations];
}
but it just scroll only one time (from first image to the second). what did i do wrong? Any idea?
Set repeats to YES. It's the last parameter. Also, make sure the interval is not 0. (the posted code shows .0)
timer = [NSTimer scheduledTimerWithTimeInterval:3.0
target:self
selector:#selector(scrolling)
userInfo:nil
repeats:YES];
Related
I am animating an UIImageview in horizontal position for this purpose i have used the below code i have used the NSTimer
timer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
-(void)onTimer
{
[UIView animateWithDuration:10.0f animations:^{
//Moving_Cloud is an image view
Moving_Cloud.frame = CGRectMake(200.0f, 150.0f, Moving_Cloud.frame.size.width, Moving_Cloud.frame.size.height);
}];
}
now the problem i am facing is i need to get the coordinates of the "Moving_Cloud" after the animate duration
please help me
Thanks in advance.
Abhijit Chaudhari from the comment in my previous post I understand that what you want is not the position "after the animate duration" but instead the position during the animation.
If I still didn't get it right please clarify your question. (Or buy me an new brain)
-(void) animateMe(){
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:#selector(onTimer:) userInfo:nil repeats:YES];
[UIView animateWithDuration:10.0f animations:^{
//Moving_Cloud is an image view
Moving_Cloud.frame = CGRectMake(200.0f, 150.0f, Moving_Cloud.frame.size.width, Moving_Cloud.frame.size.height);
}];
}
-(void)onTimer:(id)sender{
NSLog(#"Currently in x=%f", [[ddddd.layer presentationLayer] frame].origin.x);
NSLog(#"Currently in y=%f", [[ddddd.layer presentationLayer] frame].origin.y);
}
[UIView animateWithDuration:10.0f animations:^{
Moving_Cloud.frame = CGRectMake(200.0f, 150.0f, Moving_Cloud.frame.size.width, Moving_Cloud.frame.size.height);
} completion:^(BOOL finished){
CGPoint newPost = Moving_Cloud.frame.origin;
CGFloat xPos = newPost.x;
CGFloat yPos = newPost.y;
// do stuff ?
}];
At the end of your animation the block "completion:" will be trigger.
Normally your image should be in x = 200, y = 150.
Be aware that those coordinates are relative to it superview (the view wrapping Moving_Cloud view).
Note:
By convention I recommend changing "Moving_Cloud" to "movingCloud".
Instance class start in lower cap in objective-C.
Also don't use _ but a capital letter instead.
I've set up some code to scroll (paging) the scrollview automatically, after a TimeInterval. Now I want to stop the scrollview animating, after 4 times. Could someone teach me how to do that?
This is my code.
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
- (void) onTimer {
// Updates the variable h, adding 320
abc += 320;
//This makes the scrollView scroll to the desired position
[UIView animateWithDuration:1.5f animations:^{
[scrollView setContentOffset:CGPointMake(abc, 0) animated:NO];
}];
}
First add an ivar to an NSTimer
{
NSTimer *timer;
}
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
Then in the onTimer
- (void) onTimer {
//Create a static int
static int repetition = 0;
repetition ++;
if(repetition == 4)
{
repetition = 0;
//Stop the timer
[timer invalidate];
}
// Updates the variable h, adding 320
abc += 320;
//This makes the scrollView scroll to the desired position
[UIView animateWithDuration:1.5f animations:^{
[scrollView setContentOffset:CGPointMake(abc, 0)animated:NO];
}];
}
I'm trying to have a button move to a co-ordinates, pause, move to another co-orinates, pause, then move again. the process should then repeat infinitely. what I have right now just moves the last step.
this is what I have so far ('mover' is the UIButton name):
- (void) firstAnimation {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:5];
[UIView setAnimationRepeatCount:-1];
[UIView setAnimationRepeatAutoreverses:NO];
CGPoint pos = mover.center;
pos.y = 200.f;
pos.x = 169.f;
mover.center = pos;
[NSTimer timerWithTimeInterval:1.0 target:self selector:#selector(firstAnimation:) userInfo:nil repeats:NO];
pos.y = 100.f;
pos.x = 179.f;
mover.center = pos;
[NSTimer timerWithTimeInterval:1.0 target:self selector:#selector(firstAnimation:) userInfo:nil repeats:NO];
pos.y = 160.f;
pos.x = 129.f;
mover.center = pos;
[UIView commitAnimations];
}
thanks for any help
You don't need to use timers, just set the animation delegate to self and implement the animationfinished method.
See my answer here:
animations on infinite loop
If you're shipping for iOS4 exclusively, I thoroughly recommend using blocks and the following method:
[UIView animateWithDuration:kAnimationDuration
delay:kAnimationDelay
options:UIViewAnimationCurveEaseInOut
animations:^ {
// your animations here.
}
completion:^(BOOL finished) {
// what you want to do upon animation completion here.
}];
Note that in the completion block you can just as well cue up another animation. In fact, you could store the three animation blocks as block variables and then simply pass them in to the above method to be executed, one after another, until the third completes. Then just restart the process!
Blocks are your friends.
You would be better suited to use CoreAnimation keyframes and setting repeatCount = HUGE_VALF to loop forever
I have a application that runs a timer and performs a action 30 times a second. What I want to do is change the size of a UIButton i have so that every time the timer goes around, it changes the UIButton so that it is a little bit smaller. I have played with a bunch of things I have found online and I still cant figure it out.
Any ideas?
So, to move the comment out - is this generally what you're trying to do?
-(void) calledWhenTimerGoesRound
{
NSLog(#"calledWhenTimerGoesRound");
[UIView beginAnimations:nil context:#"MyAnimation"];
CGRect tempFrame = myButton.frame;
tempFrame.size.width = tempFrame.size.width - 5.0f;
tempFrame.size.height = tempFrame.size.height - 5.0f;
myButton.frame = tempFrame;
[UIView commitAnimations];
}
What does your timer code look like? Here's and example of what should work (resize the button smaller every second):
- (void) startMyTimer
{
NSTimer *timer = [NSTimer timerWithTimeInterval:1 target:self selector:#selector(calledWhenTimerGoesRound) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}
Try something like:
CGRect tempFrame = myButton.frame;
myButton.frame = CGRectInset(tempFrame,5,5);
Hi guys I want to create an intro image (fade in and fade out ) for my application.
Here is my code but, when I run the app on the device I have a problem:
My main nib page has been displayed
My image fades in and then fades out and then again fades in and fades out 3 times
Here is my code and my attached file. Please check it out:
.h
#interface myProject : UIViewController {
float alphaValue, imageAlphaValue;
}
UIImageView *IntroImage;
NSTimer *AlphaTimer;
#end
.m
-(void)viewDidLoad
{
imageAlphaValue = 0.0;
alphaValue = 0.035;
IntroImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[self.view addSubview:IntroImage];
[IntroImage setImage:[UIImage imageNamed:#"yourimagenamehere.png"]]; //use your image here
[IntroImage setBackgroundColor:[UIColor blueColor]];
[IntroImage setAlpha:imageAlphaValue];
[IntroImage release];
AlphaTimer = [NSTimer scheduledTimerWithTimeInterval:(0.05) target:self selector:#selector(setAlpha) userInfo:nil repeats:YES];
[NSTimer scheduledTimerWithTimeInterval:(2.0) target:self selector:#selector(changeAlpha) userInfo:nil repeats:NO];
}
-(void)setAlpha
{
imageAlphaValue = imageAlphaValue + alphaValue;
[IntroImage setAlpha:imageAlphaValue];
}
-(void)changeAlpha
{
alphaValue = -0.035;
}
my sample code
wow.... why you cannot just use something like that to change your image's alpha?
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0f];
[UIView setAnimationDelegate:self];
[introImage setAlpha:0.0f];
[UIView commitAnimations];
Seems to be not surprising that the main nib is shown, because it is the viewDidLoad method!
I'd also prefer to make use of the animation stuff like in morion's answer. Even though: The repeated fading is probably caused by viewDidLoad called more than once. Check it out with debugging or logging.