尝试“打开/关闭”不同的 UITapGestureReconginzer 方法

Question

我有这个可爱的导航栏资源：

navBar view http://dl.dropbox.com/ u/1734050/ViewWithNavBar.jpg

，当用户点击中间按钮（带有箭头的按钮）时，它将显示另一个可爱的“共享框”资源

导航栏中的共享框下拉菜单 http://dl.dropbox.com/u/1734050/navBarWithShareBox.jpg< /a>

到目前为止，我在代码中的内容是，当点击屏幕时，导航栏将出现，并在再次点击时消失。其次，当用户点击“共享”按钮时，会出现共享框，用户可以点击框外部将其关闭。

问题是：调出共享框后我无法关闭导航栏！

这是一些代码：

-(void)viewDidLoad {

...
...
...

    UITapGestureRecognizer *tapNavBar = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapForNavBar:)];
    self.tapForNavBar = tapNavBar;

    [self.viewForTaps addGestureRecognizer:self.tapForNavBar];

    // btw, tapForNavBar is a UITapGestureRecognizer instance variable.
    // also, viewForTaps is a view (instance variable) I made to handle 
    // where the user could tap (most of the screen)

}


#pragma mark -
#pragma mark Tap and Gesture Methods

-(void)handleTapForNavBar:(UIGestureRecognizer *)gestureRecognizer {

    if (self.navBarIsHidden) {

        [UIView animateWithDuration:0.5 animations:^ {
            //self.primeViewController.view.alpha = 0.8;
            self.navBar.alpha = 1.0;
        }];
        self.detailViewButton.userInteractionEnabled = YES;
        self.shareButton.userInteractionEnabled = YES;
        self.aboutAppButton.userInteractionEnabled = YES;
        self.navBarIsHidden = NO;
    }
    else {
        [UIView animateWithDuration:0.5 animations:^ {
            self.navBar.alpha = 0.0;
            //self.primeViewController.view.alpha = 1.0;
        }];
        self.detailViewButton.userInteractionEnabled = NO;
        self.shareButton.userInteractionEnabled = NO;
        self.aboutAppButton.userInteractionEnabled = NO;
        self.navBarIsHidden = YES;
    }   

}

好的，所以这应该看起来很花花公子（并且也像它一样工作！） - 现在这里也许是它变得非正统的地方？

-(IBAction)showShareMenu:(id)sender {

    if (self.navBarShareBoxIsHidden) {
        [UIView animateWithDuration:0.5 animations:^ {
            self.navBarShareBox.alpha = 1.0;
        }];  
        [self.tapForNavBar removeTarget:nil action:NULL];
        UITapGestureRecognizer *tapShareBox = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapForShareBox:)];
        self.tapForShareBox = tapShareBox;

        [self.viewForTaps addGestureRecognizer:self.tapForShareBox];
        self.navBarShareBoxIsHidden = NO;
        self.twitterButton.userInteractionEnabled = YES;
        self.facebookButton.userInteractionEnabled = YES;
        self.googlePlusButton.userInteractionEnabled = YES;
    }
    else {
        [UIView animateWithDuration:0.5 animations:^ {
            self.navBarShareBox.alpha = 0.0;
        }];  
        [self.tapForShareBox removeTarget:nil action:NULL];
        [self.tapForNavBar addTarget:self action:@selector(handleTapForNavBar:)];
        self.navBarShareBoxIsHidden = YES;
        self.twitterButton.userInteractionEnabled = NO;
        self.facebookButton.userInteractionEnabled = NO;
        self.googlePlusButton.userInteractionEnabled = NO;
    }
}

然后，我创建此方法来处理特定的 shareBox 点击：

-(void)handleTapForShareBox:(UIGestureRecognizer *)gestureRecognizer {

    if (!self.navBarShareBoxIsHidden) {
        [UIView animateWithDuration:0.5 animations:^ {
            self.navBarShareBox.alpha = 0.0;
        }];
        self.navBarShareBoxIsHidden = YES;
        self.twitterButton.userInteractionEnabled = NO;
        self.facebookButton.userInteractionEnabled = NO;
        self.googlePlusButton.userInteractionEnabled = NO;
        [self.tapForShareBox removeTarget:nil action:NULL];
        [self.tapForNavBar addTarget:self action:@selector(handleTapForNavBar:)];
    }

}

我假设我的问题来自于 alloc/init 中的新 UITapGestureRecognizer -(IBAction)showShareMenu 方法。我认为通过使用 removeTarget... 和 addTarget 消息，我可以轻松地告诉我的代码应该使用哪种 TapGesture 方法，但考虑到它不起作用，我错了！我哪里做错了？如果您需要更多信息，我很乐意提供更多信息。

Answer 1

啊哈！看来我找到了解决办法！在我的 handleTapForShareBox 方法中，我这样做了：

-(void)handleTapForShareBox:(UIGestureRecognizer *)gestureRecognizer {

    if (!self.navBarShareBoxIsHidden) {
        [UIView animateWithDuration:0.5 animations:^ {
            self.navBarShareBox.alpha = 0.0;
        }];
        self.navBarShareBoxIsHidden = YES;
        self.twitterButton.userInteractionEnabled = NO;
        self.facebookButton.userInteractionEnabled = NO;
        self.googlePlusButton.userInteractionEnabled = NO;
        [self.tapForShareBox removeTarget:nil action:NULL];
        //[self.tapForNavBar addTarget:self action:@selector(handleTapForNavBar:)];

        // Here is the new stuff, I added another alloc init of a UITapGestureRecognizer
        // and re-assigned it to my UITap instance variable

        UITapGestureRecognizer *tapNavBar = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapForNavBar:)];
        self.tapForNavBar = tapNavBar;

        [self.viewForTaps addGestureRecognizer:self.tapForNavBar];
    }
}

现在效果很好！但是，有一些事情：

1）我是否必须释放我创建的 UITapGestureRecognizer 本地指针？或者因为我 initWithTarget 它会自动释放？

2）这是黑客攻击吗？或者这是传递不同点击方法的正确方法？我只是有点困惑为什么 removeTarget 和 addTarget 没有达到目的。