tl;dr
Все остальные ответы отключены :) См. Документацию:
Важно
Класс UIAlertController предназначен для использования «как есть» и не поддерживает создание подклассов. Иерархия представлений для этого класса является частной и не должна изменяться.
Проблема
Проблема не в UIAlertController. Это очень простой пользовательский интерфейс, один или два вида стека в зависимости от того, хотите ли вы, чтобы UIActivityIndicatorView оставался на метке заголовка или под заголовком. Анимация презентации - это то, что нам нужно.
Приведенный ниже код основан на контроллерах презентаций изнутри сеанса WWDC.
Быстрый
Воссоздать контроллер презентации:
class LOActivityAlertControllerPresentationController: UIPresentationController {
var dimmerView: UIView!
override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
self.dimmerView = UIView()
super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
dimmerView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
dimmerView.backgroundColor = UIColor.init(white: 0, alpha: 0.4)
guard let presentedView = self.presentedView else { return }
presentedView.layer.cornerRadius = 8.0
let centerXMotionEffect: UIInterpolatingMotionEffect = UIInterpolatingMotionEffect(keyPath: "center.x", type: .tiltAlongHorizontalAxis)
centerXMotionEffect.minimumRelativeValue = -10.0
centerXMotionEffect.maximumRelativeValue = 10.0
let centerYMotionEffect: UIInterpolatingMotionEffect = UIInterpolatingMotionEffect(keyPath: "center.y", type: .tiltAlongVerticalAxis)
centerYMotionEffect.minimumRelativeValue = -10.0
centerYMotionEffect.maximumRelativeValue = 10.0
let group: UIMotionEffectGroup = UIMotionEffectGroup()
group.motionEffects = [centerXMotionEffect, centerYMotionEffect]
presentedView.addMotionEffect(group)
}
override var frameOfPresentedViewInContainerView: CGRect {
guard let containerView = self.containerView, let presentedView = self.presentedView else { return .zero }
let size = presentedView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
var frame = CGRect.zero
frame.origin = CGPoint(x: containerView.frame.midX - (size.width / 2.0), y: containerView.frame.midY - (size.height / 2.0))
frame.size = size
return frame
}
override func presentationTransitionWillBegin() {
guard let containerView: UIView = self.containerView, let presentedView: UIView = self.presentedView, let dimmerView = self.dimmerView else { return }
let presentingViewController: UIViewController = self.presentingViewController
dimmerView.alpha = 0.0
dimmerView.frame = containerView.bounds
containerView.insertSubview(dimmerView, at: 0)
presentedView.center = containerView.center
guard let transitionCoordinator = presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(
alongsideTransition: { _ in
dimmerView.alpha = 1.0
},
completion: nil
)
}
override func containerViewWillLayoutSubviews() {
super.containerViewWillLayoutSubviews()
guard let containerView: UIView = self.containerView, let presentedView: UIView = self.presentedView, let dimmerView = self.dimmerView else { return }
dimmerView.frame = containerView.bounds
presentedView.frame = self.frameOfPresentedViewInContainerView
}
override func dismissalTransitionWillBegin() {
guard let dimmerView = self.dimmerView, let transitionCoordinator = self.presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(
alongsideTransition: { _ in
dimmerView.alpha = 0.0
},
completion: nil
)
}
}
Анимированный переход:
class LOActivityAlertControllerAnimatedTransitioning: NSObject, UIViewControllerAnimatedTransitioning {
var presentation: Bool
init(presentation: Bool) {
self.presentation = presentation
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let containerView = transitionContext.containerView
guard let fromView = transitionContext.view(forKey: .from), let toView = transitionContext.view(forKey: .to) else { return }
if self.presentation {
containerView.addSubview(toView)
toView.transform = CGAffineTransform(scaleX: 1.6, y: 1.6)
toView.alpha = 0.0
UIView.animate(
withDuration: 0.2,
animations: {
toView.alpha = 1.0
toView.transform = .identity
},
completion: { finished in
transitionContext.completeTransition(true)
}
)
} else {
UIView.animate(
withDuration: 0.2,
animations: {
fromView.alpha = 0.0
},
completion: { finished in
fromView.removeFromSuperview()
transitionContext.completeTransition(true)
}
)
}
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.2
}
}
Пример подкласса UIViewController, приправить по вкусу XIB:
class LOActivityAlertController: UIViewController, UIViewControllerTransitioningDelegate {
var activityIndicatorView: UIActivityIndicatorView!
var titleLabel: UILabel!
var messageLabel: UILabel!
var alertTitle: String
var alertMessage: String
init(title: String, message: String) {
self.alertTitle = title
self.alertMessage = message
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("Not implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.transitioningDelegate = self
self.modalPresentationStyle = .custom
self.titleLabel = UILabel()
self.messageLabel = UILabel()
self.titleLabel.text = self.alertTitle
self.messageLabel.text = self.alertMessage
self.activityIndicatorView = UIActivityIndicatorView(style: .medium)
let currentFrame = self.view.frame
let alertFrame = CGRect(x: 0, y: 0, width: currentFrame.width / 2.0, height: currentFrame.height / 2.0)
let stackView = UIStackView(frame: alertFrame)
stackView.backgroundColor = .gray
stackView.axis = .vertical
stackView.alignment = .center
stackView.distribution = .fillProportionally
stackView.addArrangedSubview(self.titleLabel)
stackView.addArrangedSubview(self.messageLabel)
stackView.addArrangedSubview(self.activityIndicatorView)
self.activityIndicatorView.startAnimating()
self.view.addSubview(stackView)
}
override func viewDidAppear(_ animated: Bool) {
}
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
let presentationController = LOActivityAlertControllerPresentationController(presentedViewController: presented, presenting: presenting)
return presentationController
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let transitioning = LOActivityAlertControllerAnimatedTransitioning(presentation: true)
return transitioning
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let transitioning = LOActivityAlertControllerAnimatedTransitioning(presentation: false)
return transitioning
}
}
Кредиты для быстрой версии: @riciloma
Цель-C
Воссоздать контроллер презентации:
@interface LOActivityAlertControllerPresentationController : UIPresentationController
@end
@interface LOActivityAlertControllerPresentationController ()
@property (nonatomic) UIView *dimmerView;
@end
@implementation LOActivityAlertControllerPresentationController
- (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController
{
self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController];
if (self)
{
_dimmerView = [[UIView alloc] init];
_dimmerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
_dimmerView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.4];
UIView *presentedView = [self presentedView];
presentedView.layer.cornerRadius = 8.0;
UIInterpolatingMotionEffect *centerXMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
centerXMotionEffect.minimumRelativeValue = @(-10.0);
centerXMotionEffect.maximumRelativeValue = @(10.0);
UIInterpolatingMotionEffect *centerYMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
centerYMotionEffect.minimumRelativeValue = @(-10.0);
centerYMotionEffect.maximumRelativeValue = @(10.0);
UIMotionEffectGroup *group = [[UIMotionEffectGroup alloc] init];
group.motionEffects = [NSArray arrayWithObjects:centerXMotionEffect, centerYMotionEffect, nil];
[presentedView addMotionEffect:group];
}
return self;
}
- (CGRect)frameOfPresentedViewInContainerView
{
UIView *containerView = [self containerView];
UIView *presentedView = [self presentedView];
CGSize size = [presentedView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
CGRect frame = CGRectZero;
frame.origin = CGPointMake(CGRectGetMidX([containerView frame]) - (size.width / 2.0),
CGRectGetMidY([containerView frame]) - (size.height / 2.0));
frame.size = size;
return frame;
}
- (void)presentationTransitionWillBegin
{
UIViewController *presentingViewController = [self presentingViewController];
UIView *containerView = [self containerView];
UIView *presentedView = [self presentedView];
UIView *dimmerView = [self dimmerView];
dimmerView.alpha = 0.0;
dimmerView.frame = [containerView bounds];
[containerView insertSubview:dimmerView atIndex:0];
presentedView.center = [containerView center];
[[presentingViewController transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
dimmerView.alpha = 1.0;
} completion:NULL];
}
- (void)containerViewWillLayoutSubviews
{
[super containerViewWillLayoutSubviews];
UIView *containerView = [self containerView];
UIView *presentedView = [self presentedView];
UIView *dimmerView = [self dimmerView];
dimmerView.frame = [containerView bounds];
presentedView.frame = [self frameOfPresentedViewInContainerView];
}
- (void)dismissalTransitionWillBegin
{
UIViewController *presentingViewController = [self presentingViewController];
UIView *dimmerView = [self dimmerView];
[[presentingViewController transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
dimmerView.alpha = 0.0;
} completion:NULL];
}
@end
Анимированный переход:
@interface LOActivityAlertControllerAnimatedTransitioning : NSObject <UIViewControllerAnimatedTransitioning>
@property (getter=isPresentation) BOOL presentation;
@end
@implementation LOActivityAlertControllerAnimatedTransitioning
- (void)animateTransition:(nonnull id<UIViewControllerContextTransitioning>)transitionContext
{
UIView *containerView = [transitionContext containerView];
UIView *fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
if (_presentation)
{
[containerView addSubview:toView];
toView.transform = CGAffineTransformMakeScale(1.6, 1.6);
toView.alpha = 0.0;
[UIView animateWithDuration:0.2 animations:^{
toView.alpha = 1.0;
toView.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
}];
}
else
{
[UIView animateWithDuration:0.2 animations:^{
fromView.alpha = 0.0;
} completion:^(BOOL finished) {
[fromView removeFromSuperview];
[transitionContext completeTransition:YES];
}];
}
}
- (NSTimeInterval)transitionDuration:(nullable id<UIViewControllerContextTransitioning>)transitionContext
{
return 0.2;
}
@end
Пример подкласса UIViewController, приправить по вкусу XIB:
@interface LOActivityAlertController : UIViewController <UIViewControllerTransitioningDelegate>
@property (nonatomic, strong) IBOutlet UIActivityIndicatorView *activityIndicatorView;
@property (nonatomic, strong) IBOutlet UILabel *titleLabel;
@end
@implementation LOActivityAlertController
@dynamic title;
+ (instancetype)alertControllerWithTitle:(NSString *)title
{
LOActivityAlertController *alert = [LOActivityAlertController new];
alert.title = title;
return alert;
}
- (instancetype)init
{
self = [super init];
if (self)
{
self.transitioningDelegate = self;
self.modalPresentationStyle = UIModalPresentationCustom;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.titleLabel.text = self.title;
}
#pragma mark Properties
- (void)setTitle:(NSString *)title
{
[super setTitle:title];
self.titleLabel.text = title;
}
#pragma mark UIViewControllerTransitioningDelegate
- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented
presentingViewController:(UIViewController *)presenting
sourceViewController:(UIViewController *)source
{
LOActivityAlertControllerPresentationController *myPresentation = nil;
myPresentation = [[LOActivityAlertControllerPresentationController alloc]
initWithPresentedViewController:presented presentingViewController:presenting];
return myPresentation;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source;
{
LOActivityAlertControllerAnimatedTransitioning *transitioning = [LOActivityAlertControllerAnimatedTransitioning new];
transitioning.presentation = YES;
return transitioning;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
LOActivityAlertControllerAnimatedTransitioning *transitioning = [LOActivityAlertControllerAnimatedTransitioning new];
return transitioning;
}
@end
Запись экрана
Сообщение об ошибках
rdar: // 37433306: сделайте контроллер представления UIAlertController и общедоступный API делегата перехода, чтобы разрешить повторное использование.
person
catlan
schedule
11.02.2018
