| // |
| // Copyright 2020 Google Inc. |
| // |
| // 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 "GTXChecking.h" |
| |
| /** |
| Implements an OCR based contrast check that works by first identifying text regions on the |
| element's UI and performs a contrast check only on them. Since we do not rely on the element being |
| a UIKit's text view this check will work with custom elements as well. |
| @note This check requires iOS 11 for VisionKit APIs that identify text. |
| */ |
| API_AVAILABLE(ios(11.0)) |
| @interface GTXOCRContrastCheck : NSObject <GTXChecking> |
| |
| - (instancetype)init NS_UNAVAILABLE; |
| |
| /** |
| Creates an instance of @c GTXOCRContrastCheck with the given @c name and @c minRatio. |
| */ |
| - (instancetype)initWithName:(NSString *)name expectedMinimumContrastRatio:(CGFloat)minRatio; |
| |
| @end |
