I'm trying to do some animation to my UIProgressView when i finished upload a photo to my server. When i set the duration to 5.0 or 10.0 seconds, it it not different and the completition is called immediately.
[UIView animateWithDuration:5.0 animations:^{
self.progressBar.progress = 1.0;
} completion:^(BOOL finished) {
NSLog(#"kykny udah");
if (finished) {
NSLog(#"finished");
Post *post = [mappingResult.dictionary objectForKey:#""];
[self.posts insertObject:post atIndex:0];
NSLog(#"caption: %# , items: %#",post.caption, post.items);
CGRect frame = self.progressView.frame;
frame.size.height = 0;
self.progressView.frame = frame;
[self.tableView reloadData];
}
}];
how come this issue happens ? It is just like a normal sequence code in reality
Try adding the following line after updating your frame changes like
self.progressBar.progress = 1.0;
[self.view layoutIfNeeded];
This will make your animation effect for the time you specified in animation duration.
If you want to show just the progress for 10sec then
// PROGRESS VIEW IS JUST A VIEW WITH SOME BACKGROUND COLOR WITH FRAME CGRectMake(0,0,0,10)
[UIView animateWithDuration:5.0 animations:^{
self.progressView.frame = CGRectMake(0,0,100,10); // adjust the frame to get the linear animation view
} completion:^(BOOL finished) {
NSLog(#"kykny udah");
if (finished) {
.....
self.progressView.frame = CGRectMake(0,0,100,0);
.....
}
}];
Related
I have two objects that fade into display simultaneously that are initially set to hidden, I want to fire the second animation a couple of seconds after the first but they both fade in at the same time?
_text.alpha = 0;
_text.hidden = NO;
[UIView animateWithDuration:1.9 animations:^{
_text.alpha = 1;
}];
////////////second animation
_note.alpha = 0;
_note.hidden = NO;
[UIView setAnimationDelay:2.0];
[UIView animateWithDuration:1.9 animations:^{
_note.alpha = 1;
}];
Try this:
[UIView animateWithDuration:1.9 animations:^{
_text.alpha = 1;
} completion:^(BOOL finished) {
[UIView animateWithDuration:1.9 animations:^{
_note.alpha = 1;
}];
}];
The second block gets called when the first animation ended.
Use the animateWithDuration:animations:completion: method as described in the apple docs. Put the second animation into the completion block of the first one.
I have an wheel image in .png format, I want to know how can i animate so that it rotates continuously, I searched on stackoverflow and found certain snippets of code which helped me rotate my image but it wouldn't rotate continuously, it would just rotate for a few seconds and stop, the code as follows
the code in viewdidload
UIImageView *imageToMove =
[[UIImageView alloc] initWithImage:[UIImageimageNamed:#"horo_circle.png"]];
[self.view addSubview:imageToMove];
[self rotateImage:imageToMove duration:5.0
curve:UIViewAnimationCurveEaseIn degrees:180];
and the animation
- (void)rotateImage:(UIImageView *)image duration:(NSTimeInterval)duration
curve:(int)curve degrees:(CGFloat)degrees
{
// Setup the animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:duration];
[UIView setAnimationCurve:curve];
[UIView setAnimationBeginsFromCurrentState:YES];
// The transform matrix
CGAffineTransform transform =
CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(degrees));
image.transform = transform;
// Commit the changes
[UIView commitAnimations];
}
and the following lines after the import
#define M_PI 3.14159265358979323846264338327950288 /* pi */
#define DEGREES_TO_RADIANS(angle) (angle / 180.0 * M_PI)
You are better of doing this with a CABasicAnimation:
if ([self.spinnerOverlay animationForKey:#"SpinAnimation"] == nil) {
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat: 2*M_PI];
animation.duration = 10.0f;
animation.repeatCount = INFINITY;
[self.spinnerOverlay.layer addAnimation:animation forKey:#"SpinAnimation"];
}
In this code I check whether the animation is all ready set, not need to set it again.
The spinnerOverlay is in your case the UIImageView you want to rotate.
To stop the animation:
[self.spinnerOverlay.layer removeAnimationForKey:#"SpinAnimation"];
The code bellow will spin a UIImageView called iconView continiously until rotate == NO.
The image will always return to its original position.
- (void)performRotationAnimated
{
[UIView animateWithDuration:0.5
delay:0
options:UIViewAnimationOptionCurveLinear
animations:^{
self.iconView.transform = CGAffineTransformMakeRotation(M_PI);
}
completion:^(BOOL finished){
[UIView animateWithDuration:0.5
delay:0
options:UIViewAnimationOptionCurveLinear
animations:^{
self.iconView.transform = CGAffineTransformMakeRotation(0);
}
completion:^(BOOL finished){
if (_rotate) {
[self performRotationAnimated];
}
}];
}];
}
This is a variation on the same theme.
(Total duration: 2 * 0.5 = 1 sec for a spin)
Works like magic!
Here is another way to do it with a timer.
In your viewController.h file, you'll need to declare your timer and image:
#interface ViewController : UIViewController
{
IBOutlet UIImageView *spinningImage;
NSTimer *spinTimer;
}
Next, in your ViewController.m, you add this code and can make the spin go faster by lowering the time interval or by increasing the transform interval.
-(void) viewDidLoad {
spinTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target: self selector:#selector(spinVoid) userInfo:nil repeats:YES];
}
-(void) spinVoid {
spinningImage.transform = CGAffineTransformRotate(spinningImage.transform, 0.001);
}
Hope this helps!
Now that we're at iOS6, please consider switching to block based animations (that are available since iOS 4.0) rather than the classical method. Try this:
[UIView animateWithDuration:duration delay:0.0 options:UIViewAnimationOptionRepeat animations:^{
image.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(degrees));
} completion:nil];
Using the method you've chosen for animations :
[UIView setAnimationRepeatCount:10000000];
or, you can specify the UIViewAnimationOptionRepeat flag in the blocks method animateWithDuration:delay:options:animations:completion:
I'm trying to animate a view with some buttons and controllers for my main view into the screen from the right side of the screen. The problem is it doesn't animate, it just goes directly to the finished state.
This is my code:
UIStoryboard* storyBoard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
options = [storyBoard instantiateViewControllerWithIdentifier:#"OptionsView"];
options.delegate = self;
[self.view addSubview:options.view];
options.view.center = CGPointMake(floor(total_width+options.view.frame.size.width/2)+10, floor(total_height/2));
[UIView animateWithDuration:0.5
delay:0.0
options: UIViewAnimationOptionCurveEaseOut
animations:^{
options.view.center = CGPointMake(floor(total_width-options.view.frame.size.width/2)+10, floor(total_height/2));
}
completion:^(BOOL finished){
NSLog(#"Done!");
}];
EDIT
To make things more strange, if I put this animation inside the completion block of another animation then this one works, but not the new one.
UIButton* boton = (UIButton*) sender;
[UIView animateWithDuration:5.0
delay:0.0
options: UIViewAnimationOptionCurveLinear
animations:^{
boton.alpha = 0.0;
//Jumps directly to 0, animation doesn't work
}
completion:^(BOOL finished){
[UIView animateWithDuration:0.5
delay:0.0
options: UIViewAnimationOptionCurveEaseInOut
animations:^{
options.view.center = CGPointMake(floor(total_width-options.view.frame.size.width/2)+10, floor(total_height/2));
//It works now, but it doesn't take 5 seconds to start, it starts right away
}
completion:^(BOOL finished){
NSLog(#"Done!");
}];
}];
The line before the animateWithDuration:... call directly assigns the center to the same value that you're animating to. Either remove that or assign the initial center value there. An animation that has the same start and end values obviously has no effect.
Here's what I'm trying to accomplish.
A UILabel will appear on screen at 100% alpha and move up 80pts using a UIView animation. As soon as that animation ends, I want it to continue 80pts higher while fading out to alpha 0. I want these two animations to appear as one seamless animation.
I thought maybe I could do this with a UIView animation and then put a second UIView animation in the completion block as shown below. However, there appears to be a delay before the completion block is executed which prevents the two animations from appearing seamless.
Can anyone tell me the best way to do what I'm trying to do?
Thanks!
[UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear animations:^{
myLabel.center = endPoint;
}
completion:^(BOOL finished) {
[UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear animations:^{
myLabel.center = endPoint2;
myLabel.alpha = 0;
}
completion:^(BOOL finished) {
NSLog(#"animations complete");
}];
}];
This should work. I see no reason why not. Just a small addition, check for animation completion in finished block. As this will take care of any errors during animation. Also if you are planning to make this UILabel tappable then you need to make it so by setting the flag UIViewAnimationOptionAllowUserInteraction.
[UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear | UIViewAnimationOptionAllowUserInteraction animations:^{
myLabel.center = endPoint;
myLabel.alpha = 1;
}
completion:^(BOOL finished) {
if(finished){
[UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear | UIViewAnimationOptionAllowUserInteraction animations:^{
myLabel.center = endPoint2;
myLabel.alpha = 0;
}
completion:^(BOOL finished) {
NSLog(#"animations complete");
}];
}
}];
I want to let a UIImageView flash several times.
Currently I don't know how to do that.
Actual code:
-(void)arrowsAnimate{
[UIView animateWithDuration:1.0 animations:^{
arrow1.alpha = 1.0;
arrow2.alpha = 1.0;
arrow3.alpha = 1.0;
NSLog(#"alpha 1");
} completion:^(BOOL finished){
[self arrowsAnimate2];
}];
}
-(void)arrowsAnimate2{
[UIView animateWithDuration:1.0 animations:^{
arrow1.alpha = 0.0;
arrow2.alpha = 0.0;
arrow3.alpha = 0.0;
NSLog(#"alpha 0");
} completion:^(BOOL finished){;}];
}
later on I call it like this:
for (int i = 0;i < 10; i++){
[self arrowsAnimate]; }
This gives me 10x alpha 1, and then 10x alpha 0. In the middle we see only one animation.
Any suggestions?
Thanks.
There is a simpler way to achieve a flashing animation using only 1 animation block:
aview.alpha = 1.0f;
[UIView animateWithDuration:0.5f
delay:0.0f
options:UIViewAnimationOptionAutoreverse
animations:^ {
[UIView setAnimationRepeatCount:10.0f/2.0f];
aview.alpha = 0.0f;
} completion:^(BOOL finished) {
[aview removeFromSuperview];
}];
The trick is to use [UIView setAnimationRepeatCount:NTIMES/2]; *_inside_* your animation block.
No need for extra functions or extra loops.
Use
+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
and pass the UIViewAnimationOptionRepeat and probably UIViewAnimationOptionAutoreverse in your options. You shouldn't need to provide a completion block and only perform the first animation.
Edit: here is some sample code for an image that fades in and out indefinitely.
[UIView animateWithDuration:1.0
delay:0.0
options:(UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse)
animations:^{
self.myImageView.alpha = 1.0;
}
completion:NULL];
Edit 2: I see you actually need to flash it 10 times only. I wasn't able to do that with blocks actually. When the completion block executed, the animation seemed to complete instantly the remaining 9 times. I was however able to do this with just the old-style animations quite easily.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationRepeatCount:10.0];
[UIView setAnimationRepeatAutoreverses:YES];
self.myImageView.alpha = 1.0;
[UIView commitAnimations];
Edit 3: I found a way to do this with blocks.
- (void)animate
{
if (self.animationCount < 10)
{
[UIView animateWithDuration:1.0
animations:^{
self.myImageView.alpha = 1.0;
}
completion:^(BOOL finished){
[self animateBack];
}];
}
}
- (void)animateBack
{
[UIView animateWithDuration:1.0
animations:^{
self.myImageView.alpha = 0.0;
}
completion:^(BOOL finished){
self.animationCount++;
[self animate];
}];
}
Above blinking may not work when your app go background and foreground at time of blinking.
Instead of these you can take a transparent image and your actual image and animate your ImageView
UIImageView *imageview=[UIImageView new];
imageview.animationDuration=1;
imageview.animationImages = your array of images;
[imageview startAnimating];
You need to wait for an animation to complete before launching a new one. You could chain your completion block in animate2 to go back to animate, and stop based on a counter property, implementing your loop in the animate/completion blocks instead of a separate loop.