Question

在我的应用程序中，我有一个文件查看器，可以在UIWebView中显示多种类型的内容（图像，PDF，文本等）。

我有滑动控件以翻页到下一页，只要图像小于webview并且不需要滚动，这些通常都能正常工作。这是代码：

UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self  action:@selector(swipeRightAction:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
swipeRight.delegate = self;
[webView addGestureRecognizer:swipeRight];

但是，如果图像太大，则滑动控件不再起作用。我读过其他一些问题，人们尝试过类似的事情，但没有成功。

我见过有关子类化UIWebView的建议，但这种方法也没有运气。

有没有办法将滑动控件添加到可以一致工作的UIWebView？

Answer 1

对于我的情况，我最终设法让这个工作子类化UIWebView。我还创建了一个新的委托，在执行指示滑动时调用。

这可能不是最好的解决方案，但它很简单，可重用且有效。

以下是一些基本代码：

@interface SwipableWebView : UIWebView <UIGestureRecognizerDelegate>{
   id swipeableWebViewDelegate;
}
@property (nonatomic, retain) id <SwipableWebViewDelegate> swipeableWebViewDelegate;
@end


@implementation SwipableWebView{

}

@synthesize swipeableWebViewDelegate;

- (id)initWithCoder:(NSCoder *)aDecoder{
  self = [super initWithCoder:aDecoder];
  if (self) {
      UISwipeGestureRecognizer  * swipeRight = [[UISwipeGestureRecognizer     alloc]initWithTarget:self action:@selector(swipeRight:)];
    swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    [self addGestureRecognizer:swipeRight];
    swipeRight.delegate = self;

    UISwipeGestureRecognizer  * swipeLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeLeft:)];
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    [self addGestureRecognizer:swipeLeft];
    swipeLeft.delegate = self;


    UISwipeGestureRecognizer  * swipUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeUp:)];
    swipUp.direction = UISwipeGestureRecognizerDirectionUp;
    [self addGestureRecognizer:swipUp];
    swipUp.delegate = self;

    UISwipeGestureRecognizer  * swipeDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeDown:)];
    swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
    [self addGestureRecognizer:swipeDown];
    swipeDown.delegate = self;
  }
  return self;
}



-(void)swipeLeft:(id)swipe{
  [swipeableWebViewDelegate webViewSwipeLeft:swipe];
}

-(void)swipeRight:(id)swipe{
  [swipeableWebViewDelegate webViewSwipeRight:swipe];
}

-(void)swipeUp:(id)swipe{
  [swipeableWebViewDelegate webViewSwipeUp:swipe];
}

-(void)swipeDown:(id)swipe{
  [swipeableWebViewDelegate webViewSwipeDown:swipe];
}

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

@end



@protocol SwipableWebViewDelegate <NSObject>
 -(void)webViewSwipeLeft:(id)swipe;
 -(void)webViewSwipeRight:(id)swipe;
 -(void)webViewSwipeUp:(id)swipe;
 -(void)webViewSwipeDown:(id)swipe;
@end

UIWebView中的可滑动控件

1 个答案: