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Archive for the ‘iOS’ Category

Opening View in iOS 13

Wednesday, April 7th, 2021

I had a legacy iPad project that began having issues with views opening in a ‘modal’ window instead of full screen. Technically, they were being instantiated as modals, but since IOS 13 the modal view is what will be presented when using instantiateViewControllerWithIdentifier. It’s a simple fix:

if (@available(iOS 13, *)) {
    nextPage.modalPresentationStyle = UIModalPresentationCustom;
}

Unfortunately when you dismiss the view you instantiate using this, it’s parent view no longer receives a viewDidAppear event. So I had to add a call to viewDidAppear before running dismissViewControllerAnimated like so:

if (@available(iOS 13, *)) {
    [self.presentingViewController viewDidAppear:false];
}

Posted in iOS, iPad, Objective C, Swift | No Comments »

iPad UIImageView image-based animation alternative

Sunday, February 13th, 2011

I’ve been troubleshooting a project that animates 24 different sets of png images. Each set containing around 30 images. The App would eventually crash when run on an iPad after running through about half a dozen of the animations. Eventually running into a memory limit. In my search for solutions, I ran into Mo DeJong’s PNGAnimatorDemo, which completely solved the memory limit problem.

The example project he provides runs the animation full frame by default so I had to modify some things in order to add it as a subview to another view and to set it inside a CGRect.

The first thing to be done was to create a new property ‘viewCGRect’ with which I could set a CGRect for the ImageAnimatorViewController . I also took out the animationOrientation property and associated code since this is now being added as a subVIew to another view.

- (void)loadView {
// UIView *myView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
UIView *myView = [[UIView alloc] initWithFrame:viewCGRect];
[myView autorelease];
self.view = myView;

// FIXME: Additional Supported Orientations
if (animationOrientation == UIImageOrientationUp) {
// No-op
} else if (animationOrientation == UIImageOrientationLeft) {
// 90 deg CCW
[self rotateToLandscape];
} else if (animationOrientation == UIImageOrientationRight) {
// 90 deg CW
[self rotateToLandscapeRight];
} else {
NSAssert(FALSE,@"Unsupported animationOrientation");
}

- (void)loadView {

// UIView *myView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];

UIView *myView = [[UIView alloc] initWithFrame:viewCGRect];

[myView autorelease];

self.view = myView;

// FIXME: Additional Supported Orientations

if (animationOrientation == UIImageOrientationUp) {

// No-op

} else if (animationOrientation == UIImageOrientationLeft) {

// 90 deg CCW

[self rotateToLandscape];

} else if (animationOrientation == UIImageOrientationRight) {

// 90 deg CW

[self rotateToLandscapeRight];

} else {

NSAssert(FALSE,@"Unsupported animationOrientation");

}

Then inside my superViewController I modified the startAnimator method in order to pass a different file name prefix for every animation. As well as a specific length (each animation had varying lengths) and a CGRect with which to draw the animation.

- (void) startAnimator:(NSString *) pref endingWith: (int) end andFrame:(CGRect) rect {
//[viewController.view removeFromSuperview];

self.animatorViewController = [ImageAnimatorViewController imageAnimatorViewController];

NSArray *names = [ImageAnimatorViewController arrayWithNumberedNames:pref
rangeStart:1
rangeEnd:end
suffixFormat:@"%02i.png"];

NSArray *URLs = [ImageAnimatorViewController arrayWithResourcePrefixedURLs:names];

// setting the public property for our custom CGRect:

animatorViewController.viewCGRect = rect;

// we no longer need to provide an orientation //animatorViewController.animationOrientation = UIImageOrientationUp; // Rotate 90 deg CCW
animatorViewController.animationFrameDuration = ImageAnimator15FPS;
animatorViewController.animationURLs = URLs;
animatorViewController.animationRepeatCount = 0;

// Show animator before starting animation

// add the animatorViewController.view as a subView:
[self.view addSubview:animatorViewController.view];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(animationDidStartNotification:)
name:ImageAnimatorDidStartNotification
object:animatorViewController];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(animationDidStopNotification:)
name:ImageAnimatorDidStopNotification
object:animatorViewController];

[animatorViewController startAnimating];
}
[/cc]

Then lastly I commented out parts of the stopAnimator method so that the final frame of each animation would remain until I needed to dispose of it by using another method clearAnimation.

[cc lang="objc"]

- (void) stopAnimator {
[[NSNotificationCenter defaultCenter] removeObserver:self
name:ImageAnimatorDidStartNotification
object:animatorViewController];

[[NSNotificationCenter defaultCenter] removeObserver:self
name:ImageAnimatorDidStopNotification
object:animatorViewController];

[animatorViewController stopAnimating];

//    [animatorViewController.view removeFromSuperview];

//    self.animatorViewController = nil;

}

- (void) clearAnimation {
[animatorViewController.view removeFromSuperview];

self.animatorViewController = nil;

}

- (void) startAnimator:(NSString *) pref endingWith: (int) end andFrame:(CGRect) rect {

//[viewController.view removeFromSuperview];

self.animatorViewController = [ImageAnimatorViewController imageAnimatorViewController];

NSArray *names = [ImageAnimatorViewController arrayWithNumberedNames:pref

rangeStart:1

rangeEnd:end

suffixFormat:@"%02i.png"];

NSArray *URLs = [ImageAnimatorViewController arrayWithResourcePrefixedURLs:names];

// setting the public property for our custom CGRect:

animatorViewController.viewCGRect = rect;

// we no longer need to provide an orientation //animatorViewController.animationOrientation = UIImageOrientationUp; // Rotate 90 deg CCW

animatorViewController.animationFrameDuration = ImageAnimator15FPS;

animatorViewController.animationURLs = URLs;

animatorViewController.animationRepeatCount = 0;

// Show animator before starting animation

// add the animatorViewController.view as a subView:

[self.view addSubview:animatorViewController.view];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(animationDidStartNotification:)

name:ImageAnimatorDidStartNotification

object:animatorViewController];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(animationDidStopNotification:)

name:ImageAnimatorDidStopNotification

object:animatorViewController];

[animatorViewController startAnimating];

}

[/cc]

Then lastly I commented out parts of the stopAnimator method so that the final frame of each animation would remain until I needed to dispose of it by using another method clearAnimation.

[cc lang="objc"]

- (void) stopAnimator {

[[NSNotificationCenter defaultCenter] removeObserver:self

name:ImageAnimatorDidStartNotification

object:animatorViewController];

[[NSNotificationCenter defaultCenter] removeObserver:self

name:ImageAnimatorDidStopNotification

object:animatorViewController];

[animatorViewController stopAnimating];

// [animatorViewController.view removeFromSuperview];

// self.animatorViewController = nil;

}

- (void) clearAnimation {

[animatorViewController.view removeFromSuperview];

self.animatorViewController = nil;

}

Posted in iOS, iPad, iPhone, Objective C | No Comments »

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Archive for the ‘iOS’ Category

Opening View in iOS 13

iPad UIImageView image-based animation alternative

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