[MDCProgressView] Fix indeterminate animation being removed before it…

… is presented on screen.

PiperOrigin-RevId: 321083086

components/ProgressView/examples/ProgressViewInDialogExample.m

@@ -0,0 +1,102 @@
+// Copyright 2020-present the Material Components for iOS authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <UIKit/UIKit.h>
+
+#import "MaterialButtons.h"
+#import "MaterialButtons+Theming.h"
+#import "MaterialDialogs.h"
+#import "MaterialProgressView.h"
+#import "MaterialProgressView+Theming.h"
+#import "MaterialColorScheme.h"
+#import "MaterialContainerScheme.h"
+
+// static const CGFloat kMDCProgressViewIndeterminateAnimationDuration = 4;
+static const CGFloat kMDCProgressViewHeight = 2;
+
+@interface ProgressViewInDialogExample : UIViewController
+
+@property(nonatomic, strong) MDCAlertController *alertViewController;
+@property(nonatomic, strong) MDCProgressView *indeterminateProgressView;
+@property(nonatomic, strong) MDCContainerScheme *containerScheme;
+@property(nonatomic, strong) MDCButton *alertButton;
+@end
+
+@implementation ProgressViewInDialogExample
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  if (!self.containerScheme) {
+    self.containerScheme = [[MDCContainerScheme alloc] init];
+  }
+
+  self.title = @"Progress View (Dialogs)";
+  self.view.backgroundColor = self.containerScheme.colorScheme.backgroundColor;
+
+  [self setupButton];
+  [self setupDialog];
+}
+
+- (void)setupButton {
+  MDCButton *alertButton = [[MDCButton alloc] init];
+  [alertButton setTitle:@"Present Dialog" forState:UIControlStateNormal];
+  [alertButton applyTextThemeWithScheme:self.containerScheme];
+  [alertButton addTarget:self
+                  action:@selector(didTapButton)
+        forControlEvents:UIControlEventTouchUpInside];
+  alertButton.translatesAutoresizingMaskIntoConstraints = NO;
+  [self.view addSubview:alertButton];
+  [alertButton.centerXAnchor constraintEqualToAnchor:self.view.centerXAnchor].active = YES;
+  [alertButton.centerYAnchor constraintEqualToAnchor:self.view.centerYAnchor].active = YES;
+  self.alertButton = alertButton;
+}
+
+- (void)setupDialog {
+  MDCProgressView *indeterminateProgressView = [[MDCProgressView alloc] init];
+  indeterminateProgressView.mode = MDCProgressViewModeIndeterminate;
+  indeterminateProgressView.translatesAutoresizingMaskIntoConstraints = NO;
+  indeterminateProgressView.frame = CGRectMake(0, 0, 0, kMDCProgressViewHeight);
+  [indeterminateProgressView applyThemeWithScheme:self.containerScheme];
+  [indeterminateProgressView startAnimating];
+  self.indeterminateProgressView = indeterminateProgressView;
+
+  MDCAlertController *alertViewController = [[MDCAlertController alloc] init];
+  alertViewController.title = @"Dialog with Progress View";
+  MDCAlertAction *dismissAction = [MDCAlertAction
+      actionWithTitle:@"OK"
+              handler:^(MDCAlertAction *_Nonnull action) {
+                [self.alertViewController dismissViewControllerAnimated:YES completion:nil];
+              }];
+  [alertViewController addAction:dismissAction];
+  alertViewController.accessoryView = indeterminateProgressView;
+  self.alertViewController = alertViewController;
+}
+
+- (void)didTapButton {
+  [self presentViewController:self.alertViewController animated:YES completion:nil];
+}
+
+#pragma mark - CatalogByConvention
+
++ (NSDictionary *)catalogMetadata {
+  return @{
+    @"breadcrumbs" : @[ @"Progress View", @"Progress View In Dialog" ],
+    @"description" : @"Progress indicators presented in a dialog",
+    @"primaryDemo" : @NO,
+    @"presentable" : @YES,
+  };
+}
+
+@end

components/ProgressView/src/MDCProgressView.m

@@ -445,6 +445,7 @@ - (void)startAnimatingBar {
   CAAnimationGroup *progressViewAnimationGroup = [[CAAnimationGroup alloc] init];
   progressViewAnimationGroup.animations = @[ progressViewHead, progressViewTail ];
   progressViewAnimationGroup.duration = 1.8;
+  progressViewAnimationGroup.removedOnCompletion = NO;
   progressViewAnimationGroup.repeatCount = HUGE_VALF;
 
   [self.progressView.shapeLayer addAnimation:progressViewAnimationGroup
@@ -474,6 +475,7 @@ - (void)startAnimatingBar {
   indeterminateProgressViewAnimationGroup.animations =
       @[ indeterminateProgressViewHead, indeterminateProgressViewTail ];
   indeterminateProgressViewAnimationGroup.duration = 1.8;
+  indeterminateProgressViewAnimationGroup.removedOnCompletion = NO;
   indeterminateProgressViewAnimationGroup.repeatCount = HUGE_VALF;
 
   [self.indeterminateProgressView.shapeLayer addAnimation:indeterminateProgressViewAnimationGroup