Question

如何滑动（左）html页面？

Answer 1

处理在Web视图上发生的手势非常棘手，因为UIWebView真的很贪婪，并希望处理所有这些。

与网络视图一样，您可以尝试使用Javascript完成所有操作。您可以在此S.O. post中阅读有关它的内容。

我喜欢在网页视图上处理捏合（缩放）和滑动的方式如下：

子类UIWindow：

   @interface MyWebNavigatorWindow : UIWindow {

在application:didFinishLaunchingWithOptions中安装该窗口类型的实例作为您应用的窗口：
```
  _window = [[MyWebNavigatorWindow alloc] initWithFrame:rect];
```
或者，您可以在Interface Builder中为窗口对象分配一个类。

处理sendEvent课程MyWebNavigatorWindow中的滑动和捏合：

  - (void)sendEvent:(UIEvent*)event {
    NSSet* allTouches = [event allTouches];
    UITouch* touch = [allTouches anyObject];
    UIView* touchView = [touch view];

您需要sendEvent中的机制来检测何时在您的网络视图中发生触摸。在我的情况下，我“注册”我要处理触摸的所有视图，然后检查触摸是否在其中：
```
        for (UIView* view in self.controlledViews) {  // self.controlledViews is the array of all "registered" views
      if ([touchView isDescendantOfView:view]) {
```

然后我处理各种触摸阶段以检测它是什么样的手势（代码片段不可编辑，但它给出了想法）：

        if (touch.phase == UITouchPhaseBegan) {
        NSLog(@"TOUCH BEGAN");
        _initialView = touchView;
        startTouchPosition1 = [touch locationInView:self];
        startTouchTime = touch.timestamp;

        if ([allTouches count] > 1) {
            startTouchPosition2 = [[[allTouches allObjects] objectAtIndex:1] locationInView:self];
            previousTouchPosition1 = startTouchPosition1;
            previousTouchPosition2 = startTouchPosition2;
        }
    }

    if (touch.phase == UITouchPhaseMoved) {
        NSLog(@"TOUCH MOVED");
        if ([allTouches count] > 1) {
            CGPoint currentTouchPosition1 = [[[allTouches allObjects] objectAtIndex:0] locationInView:self];
            CGPoint currentTouchPosition2 = [[[allTouches allObjects] objectAtIndex:1] locationInView:self];

            CGFloat currentFingerDistance = CGPointDist(currentTouchPosition1, currentTouchPosition2);
            CGFloat previousFingerDistance = CGPointDist(previousTouchPosition1, previousTouchPosition2);
            if (fabs(currentFingerDistance - previousFingerDistance) > ZOOM_DRAG_MIN) {
                NSNumber* movedDistance = [NSNumber numberWithFloat:currentFingerDistance - previousFingerDistance];
                if (currentFingerDistance > previousFingerDistance) {
                    NSLog(@"zoom in");
                    [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ZOOM_IN object:movedDistance];
                } else {
                    NSLog(@"zoom out");
                    [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ZOOM_OUT object:movedDistance];
                }
            }
        }
    }

    if (touch.phase == UITouchPhaseEnded) {
        CGPoint currentTouchPosition = [touch locationInView:self];

        // Check if it's a swipe
        if (fabsf(startTouchPosition1.x - currentTouchPosition.x) >= SWIPE_DRAG_HORIZ_MIN &&
            fabsf(startTouchPosition1.x - currentTouchPosition.x) > fabsf(startTouchPosition1.y - currentTouchPosition.y) &&
            touch.timestamp - startTouchTime < 0.7
            ) {
            // It appears to be a swipe.
            if (startTouchPosition1.x < currentTouchPosition.x) {
                NSLog(@"swipe right");
                [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_SWIPE_RIGHT object:touch];
            } else {
                NSLog(@"swipe left");
                [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_SWIPE_LEFT object:touch];
            }
        }
        startTouchPosition1 = CGPointMake(-1, -1);
        _initialView = nil;
    }

滑动html页面如果我水平滑动，请加载另一个html页面

1 个答案: