首先说一下我们项目是怎么简单解决的
@interface BaseNav : UINavigationController
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationBar.hidden = YES;
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.viewControllers.count >= 1)
{
viewController.hidesBottomBarWhenPushed = YES;
}
[super pushViewController:viewController animated:animated];
self.interactivePopGestureRecognizer.delegate = self;
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
BOOL ok = YES; // 默认为支持右滑反回
if ([self.topViewController isKindOfClass:[XTYBaseWebViewController class] ]|| [self.topViewController isKindOfClass:[GenericWebViewController class] ]||[self.topViewController isKindOfClass:[TempActViewController class] ]) {
ok = NO;
}
return ok;
}
当让这可能不是最好的解决方案 于是又是在网上各种查
出现的原因
iOS系统中，滑动返回手势，其实是一个UIPanGestureRecognizer，系统默认的操作是只有滑动屏幕的左边的某个位置，UIPanGestureRecognizer才会起作用。UIScrollView的滑动手势也是UIPanGestureRecognizer。UIGestureRecognizer和UIView是多对一的关系（具体点这里），UIGestureRecognizer一定要和view进行绑定才能发挥作用。因此不难想象，UIGestureRecognizer对于屏幕上的手势事件，其接收顺序和UIView的层次结构是一致的
UINavigationController.view —> UIViewController.view —> UIScrollView —> Screen and User's finger
即UIScrollView的panGestureRecognizer先接收到了手势事件，直接就地处理而没有往下传递。
实际上这就是两个panGestureRecognizer共存的问题。
解决方案一
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if ([self panBack:gestureRecognizer]) {
return NO;
}
return YES;
}
- (BOOL)panBack:(UIGestureRecognizer *)gestureRecognizer {
if (gestureRecognizer == self.panGestureRecognizer) {
UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;
CGPoint point = [pan translationInView:self];
UIGestureRecognizerState state = gestureRecognizer.state;
if (UIGestureRecognizerStateBegan == state || UIGestureRecognizerStatePossible == state) {
CGPoint location = [gestureRecognizer locationInView:self];
if (point.x > 0 && location.x < 20 && self.contentOffset.x <= 0) {
return YES;
}
}
}
return NO;
}
解决方案二
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
// 首先判断otherGestureRecognizer是不是系统pop手势
if ([otherGestureRecognizer.view isKindOfClass:NSClassFromString(@"UILayoutContainerView")]) {
// 再判断系统手势的state是began还是fail，同时判断scrollView的位置是不是正好在最左边
if (otherGestureRecognizer.state == UIGestureRecognizerStateBegan && self.contentOffset.x == 0) {
return YES;
}
}
return NO;
}
原理：
scrollView的pan手势会让系统的pan手势失效，所以我们只需要在系统手势失效且scrollView的位置在初始位置的时候让两个手势同时启用就可以了。
下面一个 git 连接 运动 runtime 来做的侧滑返回
https://github.com/W-King/PPX_LateralSpreads
