webView添加手勢的衝突問題

    首先webView 上添加兩個手勢,

    // 點擊webView 中心區域,從上面和下面彈出兩個菜單欄

        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapWebView:)];

        tap.delegate  = self;

        [self.webView addGestureRecognizer:tap];

        // 長按webView彈出 UIMenuViewController 增長複製 地圖 百科等功能.

        UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressWebView:)];

        [longPressGesture setDelegate:self];

        [self.webView addGestureRecognizer:longPressGesture];

 

要想讓點擊手勢起做用須要實現 :

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    if ([otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] && [gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {

       return YES;

}

 

這樣就技能響應點擊手勢 又能響應長按手勢了,可是還有一個問題,那就是長按 webView 中心區域時 既會出現UIMenuController 又會彈出上下菜單欄......!

爲了解決這個問題就須要繼續在這個手勢的代理方法中作手腳了.

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    /**

     *  若是第一個手勢是點擊第二個是長按就返回NO 不支持同時響應長按和點擊手勢

     */

    if ([otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] && [gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {

        return NO;

    } else {

       return YES;

    }

}

這樣一來 長按中心區域就只會出現,U了 而不會彈出上下菜單欄. tap 和 longPress手勢又都能響應了!

--------

::要想讓UIMenuController彈出菜單控制器必須實現:

-(BOOL)canBecomeFirstResponder

{

    return YES;

}

---複製的實現

 

-(void)menuCopy:(id)sender

{

    [self.webView performSelector:@selector(copy:)];

} 選擇和全選的實現同copy!