iOS 单元测试按钮已分配 Action

Question

我以编程方式编写了以下按钮:

self.button = [[UIButton alloc] init];
[self.button setTitle:@"Reverse String!" forState:UIControlStateNormal];
self.button.backgroundColor = [UIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:1.0];
self.button.layer.cornerRadius = 5.0;
[self.button addTarget:self action:@selector(reverseString:) forControlEvents:UIControlEventTouchUpInside];

但是，当我尝试测试时，我的单元测试失败了:

-(void)testButtonActionAssigned
{
    XCTAssert([self.vc.button respondsToSelector:@selector(reverseString:)]);
}

我收到一条失败消息:

test failure: -[ViewControllerTests testButtonActionAssigned] failed: (([self.vc.button respondsToSelector:@selector(reverseString:)]) is true) failed

我的设置方法被称为:

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

    NSLog(@"THIS METHOD IS CALLED");
}

这与模拟器计时和启动有关吗？

Answer 1

[self.button addTarget:self action:@selector(reverseString:) forControlEvents:UIControlEventTouchUpInside];   

第一行意味着 reverseString: 方法应该在你的 ViewController 中(由 target: 参数指定，你传递 self 那里)。因此，您需要通过删除 .button

来更改测试

 -(void)testButtonActionAssigned
    {
        XCTAssert([self.vc respondsToSelector:@selector(reverseString:)]);
    }

这是一个可以改变的小例子:

UIButton *button = [UIButton new];
[button addTarget:self action:@selector(doThat:) forControlEvents:UIControlEventTouchUpInside];

NSString *selectorString = [[button actionsForTarget:self forControlEvent:UIControlEventTouchUpInside] firstObject];

SEL sel = NSSelectorFromString(selectorString);

// so now you can check if target responds to selector
// BOOL responds = [self respondsToSelector:sel];

NSLog(@"%@", selectorString);