Use this in your Xcode test cases to wait for something to happen while waiting on an exception

XCTestCase-RLWaitWithExpectation.m

#import <XCTest/XCTest.h>

@interface XCTestCase (RLWaitWithExpectation)

- (void)waitFor:(NSTimeInterval)seconds withExpectationBlock:(BOOL (^)())block;

@end

@implementation XCTestCase (RLWaitWithExpectation)

- (void)waitFor:(NSTimeInterval)seconds withExpectationBlock:(BOOL (^)())block
{
    NSDate *timeoutDate = [[NSDate alloc] initWithTimeIntervalSinceNow:seconds];
    
    while (YES)
    {
        if ([timeoutDate timeIntervalSinceNow] < 0 || !block())
        {
            return;
        }
        
        [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
    }
}

@end

//example
/*
XCUIApplication *app = [[XCUIApplication alloc] init];
XCUIElement *button = app.navigationBars[@"NavBar"].buttons[@"Next"];

XCTestExpectation *expectation = [self expectationWithDescription:@"waiting"];

[self waitFor:8.0 withExpectationBlock:^BOOL()
{
    if (button.exists && button.enabled)
    {
        [expectation fulfill];
        return YES;
    }
    
     return NO;
 }];

[self waitForExpectationsWithTimeout:10.0 handler:^(NSError *error)
{
    if (error)
    {
        XCTFail(@"Expectation Failed with error: %@", error);
    }
}];


*/