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  • 关于UITapGestureRecognizer的一些问题

    1.一个gesture只能对应一个view。这是最根本的

    //若这样写,那么只有self.view能添加手势,self.navigationController.navigationBar是添加不上的,因为被覆盖了
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideAddZone)];
    gesture.numberOfTapsRequired = 1;
    [self.navigationController.navigationBar addGestureRecognizer:gesture];
    [self.view addGestureRecognizer:gesture];
    //这样写也只能往self.view添加上手势,因为就算对gestureNavigation和gestureBaseview赋值,但它们都赋的为同一内存地址的gesture,
    //本质上还是同一个gesture
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideAddZone)];
    gesture.numberOfTapsRequired = 1;
    self.gestureNavigation = gesture;
    self.gestureBaseview = gesture;
    [self.navigationController.navigationBar addGestureRecognizer:self.gestureNavigation];
    [self.view addGestureRecognizer:self.gestureBaseview];

    所以对不同的view,只能这样写

    //可以这样写,这样两个view都可以加上手势
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideAddZone)];
    gesture.numberOfTapsRequired = 1; //确认是单击其他区域,而不是双击等其它操作
    [self.navigationController.navigationBar addGestureRecognizer:gesture];
    
    UITapGestureRecognizer *gestureBaseView = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideAddZone)];
    gestureBaseView.numberOfTapsRequired = 1;
    [self.view addGestureRecognizer:gestureBaseView];

    2.UITabBarController添加上手势后无法切换的问题

    在viewDidLoad内对self.view添加手势

    - (void)viewDidLoad {
        [super viewDidLoad];
        
        UITapGestureRecognizer *gestureBaseView = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideAddZone)];
        gestureBaseView.numberOfTapsRequired = 1;
        self.gestureBaseview = gestureBaseView;
        [self.view addGestureRecognizer:self.gestureBaseview];
    }

    这样虽然可以添加手势,但底下的tabbar无法切换

    此时需要做的就是实现手势的代理UIGestureRecognizerDelegate,需要手势时,返回YES;不需要时返回NO

    -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
        if (self.addView.hidden == YES) {
            return NO;
        } else {
            return YES;
        }
    }
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  • 原文地址:https://www.cnblogs.com/Apologize/p/4989180.html
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