Can I check if a view exists on the screen with KIF?

Question

I am making a "before each" step and I am wanting to do steps to logout. I can't find anything about checking if an element exists before I try to touch it, then if it doesn't exist do something else. Is it possible to do this with KIF without having a reference to the object I want to check for?

Something like:

if([tester elementExistsWithAccesibilityLabel:@"backButton"])
{
    [tester tapViewWithAccessibilityLabel:@"backButton"];
}
else
{
    [tester tapViewwithAccesibilityLabel:@"Logout"];
}

Answer 1

I would suggest to try this approach:

if([[[UIApplication sharedApplication] keyWindow] accessibilityElementWithLabel:@"backButton"] != nil) {
     [tester tapViewWithAccessibilityLabel:@"backButton"];
} else {
     [tester tapViewWithAccessibilityLabel:@"Logout"];
}

Answer 2

These methods do the trick. Add them to a category for KIFUITestActor.

#import "UIApplication-KIFAdditions.h" 
#import "UIAccessibilityElement-KIFAdditions.h"
#import "NSError-KIFAdditions.h"

- (BOOL)existsViewWithAccessibilityLabel:(NSString *)label
{
    UIView *view = nil;
    UIAccessibilityElement *element = nil;
    return [self existsAccessibilityElement:&element view:&view withLabel:label value:nil traits:UIAccessibilityTraitNone tappable:YES];
}

- (BOOL)existsAccessibilityElement:(UIAccessibilityElement **)element view:(out UIView **)view withLabel:(NSString *)label value:(NSString *)value traits:(UIAccessibilityTraits)traits tappable:(BOOL)mustBeTappable
{
    KIFTestStepResult (^executionBlock)(NSError **) = ^(NSError **error) {
        return [UIAccessibilityElement accessibilityElement:element view:view withLabel:label value:value traits:traits tappable:mustBeTappable error:error] ? KIFTestStepResultSuccess : KIFTestStepResultWait;
    };

    NSDate *startDate = [NSDate date];
    KIFTestStepResult result;
    NSError *error = nil;
    NSTimeInterval timeout = 10.0;

    while ((result = executionBlock(&error)) == KIFTestStepResultWait && -[startDate timeIntervalSinceNow] < timeout) {
        CFRunLoopRunInMode([[UIApplication sharedApplication] currentRunLoopMode] ?: kCFRunLoopDefaultMode, 0.1, false);
    }

    if (result == KIFTestStepResultWait) {
        error = [NSError KIFErrorWithUnderlyingError:error format:@"The step timed out after %.2f seconds: %@", timeout, error.localizedDescription];
        result = KIFTestStepResultFailure;
    }

    return (result == KIFTestStepResultSuccess) ? YES : NO;
}

It works for me very well.

Answer 3

In case anyone is still looking for an answer, there is a family of methods in KIF that does just that KIFUITestActor-ConditionalTests.h:

- (BOOL)tryFindingViewWithAccessibilityLabel:(NSString *)label error:(out NSError **)error;

- (BOOL)tryFindingViewWithAccessibilityLabel:(NSString *)label traits:(UIAccessibilityTraits)traits error:(out NSError **)error;

- (BOOL)tryFindingViewWithAccessibilityLabel:(NSString *)label value:(NSString *)value traits:(UIAccessibilityTraits)traits error:(out NSError **)error;

- (BOOL)tryFindingTappableViewWithAccessibilityLabel:(NSString *)label error:(out NSError **)error;

- (BOOL)tryFindingTappableViewWithAccessibilityLabel:(NSString *)label traits:(UIAccessibilityTraits)traits error:(out NSError **)error;

- (BOOL)tryFindingTappableViewWithAccessibilityLabel:(NSString *)label value:(NSString *)value traits:(UIAccessibilityTraits)traits error:(out NSError **)error;

- (BOOL)tryFindingAccessibilityElement:(out UIAccessibilityElement **)element view:(out UIView **)view withIdentifier:(NSString *)identifier tappable:(BOOL)mustBeTappable error:(out NSError **)error;

- (BOOL)tryFindingAccessibilityElement:(out UIAccessibilityElement **)element view:(out UIView **)view withElementMatchingPredicate:(NSPredicate *)predicate tappable:(BOOL)mustBeTappable error:(out NSError **)error;

If you're using the Accessibility Identifier additions (pod 'KIF/IdentifierTests') there's also the very handy equivalent method: - (BOOL) tryFindingViewWithAccessibilityIdentifier:(NSString *) accessibilityIdentifier;

Answer 4

For swift 3:

/** return true when the view is found */
func searchForElement(_ label:String) -> Bool{
    do {
        try tester().tryFindingView(withAccessibilityLabel: label)
        return true
    } catch {
        return false

    }
}