[Chips] Adds disabling chip example to the Dragons catalog.

PiperOrigin-RevId: 302095580

Author: bryanoltman

components/Chips/examples/ChipsDisablingExampleViewController.m

@@ -0,0 +1,75 @@
+// 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 "MaterialChips.h"
+#import "MaterialContainerScheme.h"
+
+/*
+ An example to demonstrate the bug described in b/133136148
+ To reproduce, repeatedly tap on the chip in this example.
+
+ Expected: The chip returns to its starting state once re-enabled
+ Actual:   The chip continues to get darker and darker as it is tapped
+ */
+@interface ChipsDisablingExampleViewController : UIViewController
+@property(nonatomic, strong) MDCChipView *chipView;
+@property(nonatomic, strong) id<MDCContainerScheming> containerScheme;
+@end
+
+@implementation ChipsDisablingExampleViewController
+
+- (id)init {
+  self = [super init];
+  if (self) {
+    _containerScheme = [[MDCContainerScheme alloc] init];
+  }
+  return self;
+}
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  self.view.backgroundColor = self.containerScheme.colorScheme.backgroundColor;
+
+  self.chipView = [[MDCChipView alloc] init];
+  self.chipView.titleLabel.text = @"I'm a chip";
+  self.chipView.frame = CGRectMake(20, 100, 200, 50);
+  [self.chipView addTarget:self
+                    action:@selector(onChipTapped:)
+          forControlEvents:UIControlEventTouchUpInside];
+
+  [self.view addSubview:self.chipView];
+}
+
+- (void)onChipTapped:(MDCChipView *)chipView {
+  chipView.enabled = NO;
+  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)),
+                 dispatch_get_main_queue(), ^{
+                   chipView.enabled = YES;
+                 });
+}
+
+@end
+
+@implementation ChipsDisablingExampleViewController (CatalogByConvention)
+
++ (NSDictionary *)catalogMetadata {
+  return @{
+    @"breadcrumbs" : @[ @"Chips", @"Disabling" ],
+    @"primaryDemo" : @NO,
+    @"presentable" : @NO,
+  };
+}
+
+@end