目标c：从视图/图像/按钮外部开始触摸时检测触摸开始/向下答案

【问题标题】：objective c: detect touch began/down when touch started from outside of view/image/button目标c：从视图/图像/按钮外部开始触摸时检测触摸开始/向下
【发布时间】：2014-11-11 06:51:51
【问题描述】：

我有一些类似于键盘的东西（一个主视图，九个子视图）。触摸开始/向下可以在九个子视图中的任何一个子视图中开始。我检测到触摸向下/开始，以了解用户何时将手指拖入其他子视图（手指被拖入哪些视图），以及用户何时抬起手指/向上触摸/停止。

（堆栈溢出不允许发布此问题。我将尝试从答案部分粘贴代码，看看是否有效）。

// in IB set long press gesture min duration to 0.1
-(IBAction)handleLongPressOnVoices:(UILongPressGestureRecognizer *)gestureRecognizer
    {
        CGPoint location = [gestureRecognizer locationInView:gestureRecognizer.view];

    if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
        [self whichVoiceSelected:location];
    } else if(gestureRecognizer.state == UIGestureRecognizerStateChanged){
        [self whichVoiceSelected:location];
    } else if(gestureRecognizer.state == UIGestureRecognizerStateEnded){
        [self.avPlayer stop];
    }
}

-(void)whichVoiceSelected:(CGPoint)location {

int updatedSelectedVoiceNumber;

if(CGRectContainsPoint(self.voice0.frame, location)){
    updatedSelectedVoiceNumber=0;
    self.statusLabelOutlet.text = @"...";
}else if(CGRectContainsPoint(self.voice1.frame, location)){
    updatedSelectedVoiceNumber=1;
    self.statusLabelOutlet.text = @"...";
}else if(CGRectContainsPoint(self.voice2.frame, location)){
    updatedSelectedVoiceNumber=2;
    self.statusLabelOutlet.text = @"...";
} ...

... }

【问题讨论】：

标签： objective-c touch long-press

【解决方案1】：

我在许多 stackoverflow 回复中找到了部分答案。我正在粘贴我解决此问题的方法（a）以帮助下一个人和（b）作为更好解决方案的邀请。

// in IB set long press gesture min duration to 0.1
-(IBAction)handleLongPressOnVoices:(UILongPressGestureRecognizer *)gestureRecognizer
    {
        CGPoint location = [gestureRecognizer locationInView:gestureRecognizer.view];

        if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
            [self whichVoiceSelected:location];
        } else if(gestureRecognizer.state == UIGestureRecognizerStateChanged){
            [self whichVoiceSelected:location];
        } else if(gestureRecognizer.state == UIGestureRecognizerStateEnded){
            [self.avPlayer stop];
        }
    }

-(void)whichVoiceSelected:(CGPoint)location {

    int updatedSelectedVoiceNumber;

    if(CGRectContainsPoint(self.voice0.frame, location)){
        updatedSelectedVoiceNumber=0;
        self.statusLabelOutlet.text = @"...";
    }else if(CGRectContainsPoint(self.voice1.frame, location)){
        updatedSelectedVoiceNumber=1;
        self.statusLabelOutlet.text = @"...";
    }else if(CGRectContainsPoint(self.voice2.frame, location)){
        updatedSelectedVoiceNumber=2;
        self.statusLabelOutlet.text = @"...";
    } ...
...
}

【讨论】：