Use UIScreen over keyWindow to get size, so that size can be used wihout host application (#79)

Author: cltnschlosser

FBSnapshotTestCase/FBSnapshotTestCasePlatform.h

@@ -21,7 +21,7 @@ NS_ASSUME_NONNULL_BEGIN
  - FBSnapshotTestCaseFileNameIncludeOptionNone: Don't include any of these options at all.
  - FBSnapshotTestCaseFileNameIncludeOptionDevice: The file name should include the device name, as returned by UIDevice.currentDevice.model.
  - FBSnapshotTestCaseFileNameIncludeOptionOS: The file name should include the OS version, as returned by UIDevice.currentDevice.systemVersion.
- - FBSnapshotTestCaseFileNameIncludeOptionScreenSize: The file name should include the screen size of the current keyWindow, as returned by UIApplication.sharedApplication.keyWindow.bounds.size.
+ - FBSnapshotTestCaseFileNameIncludeOptionScreenSize: The file name should include the screen size of the current device, as returned by UIScreen.mainScreen.bounds.size.
  - FBSnapshotTestCaseFileNameIncludeOptionScreenScale: The file name should include the scale of the current device, as returned by UIScreen.mainScreen.scale.
  */
 typedef NS_OPTIONS(NSUInteger, FBSnapshotTestCaseFileNameIncludeOption) {

FBSnapshotTestCase/FBSnapshotTestCasePlatform.m

@@ -42,8 +42,7 @@ BOOL FBSnapshotTestCaseIs64Bit(void)
     }
 
     if ((option & FBSnapshotTestCaseFileNameIncludeOptionScreenSize) == FBSnapshotTestCaseFileNameIncludeOptionScreenSize) {
-        UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
-        CGSize screenSize = keyWindow.bounds.size;
+        CGSize screenSize = [UIScreen mainScreen].bounds.size;
         fileName = [fileName stringByAppendingFormat:@"_%.0fx%.0f", screenSize.width, screenSize.height];
     }
 

FBSnapshotTestCaseTests/FBSnapshotControllerTests.m

@@ -148,7 +148,7 @@ - (void)testFailedImageWithFileNameOptionShouldHaveAllOptionsInName
     XCTAssertTrue([filePath containsString:allOptionsIncludedReferencePath]);
 
     // Manually constructing expected filePath to make sure it looks correct
-    NSString *expectedFilePath = [NSString stringWithFormat:@"%@%@_%@_%@_%.0fx%.0f@%.fx.png", referenceImagesDirectory, NSStringFromSelector(selector), [UIDevice currentDevice].model, [[UIDevice currentDevice].systemVersion stringByReplacingOccurrencesOfString:@"." withString:@"_"], [[UIApplication sharedApplication] keyWindow].bounds.size.width, [[UIApplication sharedApplication] keyWindow].bounds.size.height, [[UIScreen mainScreen] scale]];
+    NSString *expectedFilePath = [NSString stringWithFormat:@"%@%@_%@_%@_%.0fx%.0f@%.fx.png", referenceImagesDirectory, NSStringFromSelector(selector), [UIDevice currentDevice].model, [[UIDevice currentDevice].systemVersion stringByReplacingOccurrencesOfString:@"." withString:@"_"], [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height, [[UIScreen mainScreen] scale]];
     XCTAssertEqualObjects(expectedFilePath, filePath);
 }