TouchesBegan 在下一个视图控制器中被识别

Question

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    UITouch *aTouch = [touches anyObject];

    NSLog(@"touch recognised");

    CGPoint location = [aTouch locationInView:_mainView];

    __block NSString *option = [[NSString alloc] init];
    __block NSString *type = [[NSString alloc] init];

    for (Selectors *tempView in _mainView.subviews) {
        if (CGRectContainsPoint(tempView.frame, location)) {
            NSLog(@"%@ : %@", tempView.option, tempView.type);

            option = tempView.option;
            type = tempView.type;

            break;
        }
    }


    [self moveToNextWeldCustomViewWithOption:option andType:type];


}

在我之前的 UIVIewController 中 - 然后我们在这里展示下一个 UIViewController

-(void)moveToNextWeldCustomViewWithOption:(NSString *)option andType:(NSString *)type {

    WeldDesignViewController *lobby = [self.storyboard instantiateViewControllerWithIdentifier:@"WeldDesignViewController"];

    lobby.option = option;
    lobby.type = type;

    [self presentViewController:lobby animated:NO completion:nil];

}

在下一个 UIViewController 中，直到 viewDidAppear 方法我才做任何事情 - 但是，在下一个 viewcontroller 中仍然可以识别开始的触摸。

Answer 1

我认为问题在于您调用的 VC "lobby" 在您提交后正在被释放。这使得它在响应者链中不被考虑。将该引用移动到呈现视图控制器的属性：

@property (nonatomic, strong) WeldDesignViewController* lobby;
// ...
-(void)moveToNextWeldCustomViewWithOption:(NSString *)option andType:(NSString *)type {

   self.lobby = [self.storyboard instantiateViewControllerWithIdentifier:@"WeldDesignViewController"];

    lobby.option = option;
    lobby.type = type;

    [self presentViewController:self.lobby animated:NO completion:nil];

}

您可能还需要在所呈现的 VC 中实现 touchesBagan，因为它可能沿着响应链到达前一个控制器。

TouchesBegan 在下一个视图控制器中被识别

TouchesBegan recognised in next view controller

objective-c

uiviewcontroller

ios

presentviewcontroller