iOS自定义全屏返回与tableView左划删除手势冲突解决

当自定义一个navigationController实现全屏右划返回时, 使用起来是不是很爽, 代码如下:

- (void)viewDidLoad {

    [super viewDidLoad];

    UIGestureRecognizer  *gester = self.interactivePopGestureRecognizer;

    UIPanGestureRecognizer *panGesTer = [[UIPanGestureRecognizer alloc] initWithTarget:gester.delegate action:NSSelectorFromString(@"handleNavigationTransition:")];

    [gester.view addGestureRecognizer:panGesTer];

    gester.delaysTouchesBegan = YES;

    panGesTer.delegate = self;
}

-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{

    if (self.childViewControllers.count == 1 ) {
        return NO;
    }
    return YES;
}

然鹅, 当你在tableView中打开左划编辑功能时发现死活也左划不了, 肿么肥四呢, 是打开姿势不对吗, MGD! 还是手势冲突呢?

好吧, 打个断点试试! 断点后发现进不来tableView的编辑方法, 进到了自定义的navigationController的gestureRecognizerShouldBegin方法, 原来是被拦截了. 那来判断一下是左划还是右划吧, 如果左划的话就不拦截, 交给tableView去响应! 代码如下(在自定义的navigationController方法中修改):

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
        
        if (self.childViewControllers.count == 1 ) {
            return NO;
        }
        
        if (self.interactivePopGestureRecognizer &&
            [[self.interactivePopGestureRecognizer.view gestureRecognizers] containsObject:gestureRecognizer]) {
            
            CGPoint tPoint = [(UIPanGestureRecognizer *)gestureRecognizer translationInView:gestureRecognizer.view];
            
            if (tPoint.x >= 0) {
                CGFloat y = fabs(tPoint.y);
                CGFloat x = fabs(tPoint.x);
                CGFloat af = 30.0f/180.0f * M_PI;
                CGFloat tf = tanf(af);
                if ((y/x) <= tf) {
                    return YES;
                }
                return NO;
                
            }else{
                return NO;
            }
        }
    }
    
    return YES;
}

史上最详细的iOS之事件的传递和响应机制-原理篇