同時按下按鈕

Question

我正在嘗試構建一個需要同時按下兩個按鈕的應用程序。

if (self->button1.touchInside && self->button2.touchInside) {
    NSLog(@"Two buttons pressed");
    }
else if (!self->button1.touchInside | !self->button2.touchInside){
    NSLog(@"One button pressed");
    }

這兩個按鈕都使用“ Touch Down”手勢選項連接到View Controller。 當我同時按下兩個按鈕（一次按下）時，控制台窗口將打印：

One button pressed
Two buttons pressed

這會干擾我的應用程序的工作方式。 我只希望控制台打印

Two buttons pressed

謝謝

Answer 1

我了解的是，當同時按下兩個按鈕時，您需要采取一些措施。 無論您嘗試什么，在這些按鈕的觸摸之間都會有一個滯后。 更好的方法是檢查是否同時按下兩個按鈕。 希望以下為您工作-

    @property(nonatomic, assign) BOOL firstButtonPressed;

    @property(nonatomic, assign) BOOL secondButtonPressed;

    //in init or viewDidLoad or any view delegates
       _firstButtonPressed = NO;
        _secondButtonPressed = NO;

    //Connect following IBActions to Touch Down events of both buttons
    - (IBAction)firstButtonPressed:(UIButton *)sender {
         _firstButtonPressed = YES;
          [self checkForButtonPress]; 
    }

    - (IBAction)secondButtonPressed:(UIButton *)sender {
         _ secondButtonPressed = YES; 
         [self checkForButtonPress];    
    }

    - (void)checkForButtonPress {
        if (_firstButtonPressed && _secondButtonPressed) {
            NSlog(@"Two buttons pressed");
        }
    }

Answer 2

您可以使用兩個布爾標志來做到這一點：

@property(nonatomic, assign) BOOL firstButtonPressed;
@property(nonatomic, assign) BOOL secondButtonPressed;

- (void)firstButtonTouchDown:(id)sender
{
    _firstButtonPressed = YES;

    if (_secondButtonPressed)
    {
        // Both buttons pressed.
    }
}


- (void)secondButtonTouchDown:(id)sender
{
    _secondButtonPressed = YES;

    if (_firstButtonPressed)
    {
        // Both buttons pressed.
    }
}


- (void)firstButtonTouchCancelled:(id)sender
{
    _firstButtonPressed = NO;
}


- (void)secondButtonTouchCancelled:(id)sender
{
    _secondButtonPressed = NO;
}

或者，您也可以在觸摸下降時啟動計時器，並檢查第二次觸摸是否在您指定的時間間隔內發生。