rsc*_*ott 40 iphone cocoa objective-c ipad uigesturerecognizer
我试图让UIGestureRecognizer使用UIWebview,它是UIScrollView的子视图.这听起来很奇怪但是当我将numberOfTouchesRequired设置设置为2时,选择器会触发,但是当numberOfTouchesRequired设置为1时,选择器不会触发.
这是我的代码:
UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(select1:)];
tap1.numberOfTouchesRequired = 2;
tap1.numberOfTapsRequired = 1;
tap1.delegate = self;
[self.ans1WebView addGestureRecognizer:tap1];
[tap1 release];
- (void) select1:(UILongPressGestureRecognizer *)sender {
//Do Stuff
}
我已经通过使用Apple样本用于UIGestureRecognizer并在其笔尖中插入webview来证实了这一点.他们的tap代码可以在webview区域内的任何地方使用.
dra*_*ard 67
从我所看到的,UIWebView与其他人不一致.对于手势识别器,您可以尝试从以下位置返回YES:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
我必须向后兼容3.0,所以我最终在UIWebView中使用Javascript进行所有手势处理.不是一个好的解决方案,但它符合我的需求.我能够在元素上捕获长按,以及点击,滑动,捏合和旋转.当然,我只使用本地内容.
编辑:
您可以在PhoneGap中查找向UIWebView的委托发送消息的示例.简而言之,您使用document.location = "myscheme:mycommand?myarguments"然后解析来自此委托回调的命令和参数:
-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType {
if ( [[[inRequest URL] absoluteString] hasPrefix:@"myscheme:"] ) {
//.. parse arguments
return NO;
}
}
您可以在PhoneGap代码中看到他们设置了一个队列和计时器来发送消息.根据您的使用情况,您可能需要做同样的事情.关于这个主题还有其他问题.
这是事件处理文档.在我来说,我添加的事件监听器document从<body onload="myloader();">
function myloader() {
document.addEventListener( 'touchcancel' , touch_cancel , false );
document.addEventListener( 'touchstart' , touch_start , false );
document.addEventListener( 'touchmove' , touch_move , false );
document.addEventListener( 'touchend' , touch_end , false );
};
实际的事件处理很大程度上取决于您的需求.每个事件处理程序都将收到一个TouchEvent,其中包含touches属性,其中每个项目都是Touch.您可以在touchstart处理程序中记录开始时间和位置.如果触摸移动到很远或者错误的时间过去,那就不是长时间的触摸.
WebKit可能会尝试处理长时间触摸以启动选择和复制.在事件处理程序中,您可以使用它event.preventDefault();来停止默认行为.我还发现-webkit-user-select:nonecss属性对某些东西很方便.
var touch = {};
function touch_start( event /*TouchEvent*/ {
event.preventDefault();
touch = {};
touch.startX = event.touches.item(0).pageX;
touch.startY = event.touches.item(0).pageY;
touch.startT = ( new Date() ).getTime();
}
这只是我用过javascript的第二个项目.你可以在别处找到更好的例子.
正如您所看到的,这不是您问题的快速答案.我对我得到的结果非常满意.我正在使用的html没有一个或两个链接之外的交互元素.
Don*_*son 45
UIWebView有自己的私有视图,它还附带了手势识别器.因此,优先规则使添加到UIWebView的任何手势识别器都无法正常工作.
一种选择是实现UIGestureRecognizerDelegate协议并实现方法gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer.对于其他点按手势,从此方法返回YES.通过这种方式,您将调用您的tap控制器,并且Web视图仍将被调用.
Joh*_*rug 13
这是一个有点黑客的解决方案,但它的工作原理.UIWebView有很多内部手势识别器,如果不使用私有API,通常无法访问.但是,当你实施时,你可以免费获得它们gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:.此时,您可以告诉所有内部UITapGestureRecognizers仅在您自己的UITapGestureRecognizer失败时触发.您只需执行一次,然后从您自己的手势识别器中删除该委托.结果是您仍然可以平移和滚动webView,但它不再接收任何(单个)点击手势.
- (void)viewDidLoad
{
[super viewDidLoad];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
// view is your UIViewController's view that contains your UIWebView as a subview
[self.view addGestureRecognizer:tap];
tap.delegate = self;
}
- (void)handleTapGesture:(UITapGestureRecognizer *)gestureRecognizer
{
NSLog(@"tap!");
// this is called after gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: so we can safely remove the delegate here
if (gestureRecognizer.delegate) {
NSLog(@"Removing delegate...");
gestureRecognizer.delegate = nil;
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
if ([otherGestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
[otherGestureRecognizer requireGestureRecognizerToFail:gestureRecognizer];
NSLog(@"added failure requirement to: %@", otherGestureRecognizer);
}
return YES;
}
请享用!
我也遇到了同样的问题。这个解决方案对我有用：
1) 确保将协议添加到您的界面：UIGestureRecognizerDelegate 例如：
@interface ViewController : UIViewController <SlideViewProtocol, UIGestureRecognizerDelegate>
2）添加这行代码
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES
}
3) 设置手势
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(nextSlide)];
swipeGesture.numberOfTouchesRequired = 1;
swipeGesture.direction = (UISwipeGestureRecognizerDirectionLeft);
swipeGesture.cancelsTouchesInView = YES; [swipeGesture setDelegate:self];
[self.view addGestureRecognizer:swipeGesture];
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