ios - Xcode 5.1/iOS 7.1 : assertion failure in BKSEventFocusManager 中的单元测试问题

Question

升级到 Xcode 5.1 后运行基于 XCTest 的逻辑测试时看到以下错误 - 很想知道解决方法。

2014-03-11 12:57:42.258 xctest[25605:303] deferral properties must have a 
clientID 2014-03-11 12:57:42.258 xctest[25605:303] ***
Assertion failure in -[BKSEventFocusManager
deferEventsForClientWithProperties:toClientWithProperties:],
/SourceCache/BackBoardServices_Sim/SpringBoard-2618.99.15/megatrond/BKSEventFocusManager.m:63
<unknown>:0: error: -[CSAPIErrorHandlerTests testDisplayReachabilityAlert] : 
props must have a valid clientID (  
0   CoreFoundation      0x00b251e4 __exceptionPreprocess + 180  
1   libobjc.A.dylib     0x007988e5 objc_exception_throw + 44    
2   CoreFoundation      0x00b25048 +[NSException raise:format:arguments:] + 136     
3   Foundation          0x000114de -[NSAssertionHandler
    handleFailureInMethod:object:file:lineNumber:description:] + 116    
4   BackBoardServices   0x0197fece -[BKSEventFocusManager
    deferEventsForClientWithProperties:toClientWithProperties:] + 154   
5   UIKit               0x07a942e1 -[UIWindow _beginKeyWindowDeferral] + 176    
6   UIKit               0x07a940a7 -[UIWindow _makeKeyWindowIgnoringOldKeyWindow:] + 129    
7   UIKit               0x07a9400d -[UIWindow makeKeyWindow] + 41   
8   UIKit               0x07a943e2 -[UIWindow makeKeyAndVisible] + 91

Answer 1

我发现重现这个的最小情况如下

#import <XCTest/XCTest.h>

@interface DummyTest : XCTestCase

@end

@implementation DummyTest

- (void)setUp {
    [super setUp];
    // Put setup code here. This method is called before the invocation of each test method in the class.
}

- (void)tearDown {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
    [super tearDown];
}

- (void)testExample {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title"
                                                    message:@"Message"
                                                   delegate:nil
                                          cancelButtonTitle:@"Cancel"
                                          otherButtonTitles:nil];

    // Commenting out the next row does not cause the problem
    [alert show];

    XCTAssertTrue(YES);
}

@end

似乎在测试中显示 UIAlertView 会导致此问题。这在 Xcode 5.0 中有效，但在 Xcode 5.1 中被破坏。

• Xcode 5.1 版 (5B130a)
• OSX 版本 10.9.2

如果您遇到此问题，请尝试上面的代码，看看它是否可重现