Question

我正在尝试创建一个按钮子类，它为一个按钮（当它被选中时）着色，这取决于它是否是多项选择问题的正确答案。

我这样做是这样的：在我的UIViewController中：

- (IBAction)answerQuestion:(id)sender {
    QGPrettyButton *answerButton;
    if ([sender isKindOfClass:[UIButton class]]) {
        answerButton = (QGPrettyButton *)sender;
        answerButton.isCorrectAnswer = [self.quizGame checkAnswer:self.currentQuestion answer:answerButton.titleLabel.text];
        [self performSelector:@selector(removeQuestion) withObject:nil afterDelay:TIME_TO_SHOW_CORRECT_ANSWER];
    }
}

在isCorrectAnswer的setter方法中：

- (void)setIsCorrectAnswer:(BOOL)isCorrectAnswer
{
    self.selected = YES;
    [self setNeedsDisplay];
    [self performSelector:@selector(returnToUnselected) withObject:nil afterDelay:TIME_TO_SHOW_CORRECT_ANSWER];
    _isCorrectAnswer = isCorrectAnswer;
}

- (void)returnToUnselected
{
    self.selected = NO;
    [self setNeedsDisplay];
}

在我的QGPrettyButton的绘制方法中：

CGFloat hue = UNSELECTED_HUE;
CGFloat saturation = UNSELECTED_SATURATION;

if (self.state == UIControlStateHighlighted) {
    hue = HOVERED_HUE;
    saturation = HOVERED_SATURATION;
}
if (self.state == UIControlStateSelected) {
    hue = self.isCorrectAnswer ? CORRECT_HUE : INCORRECT_HUE;
}

覆盖触摸：

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    [self setNeedsDisplay];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesMoved:touches withEvent:event];
    [self setNeedsDisplay];

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesCancelled:touches withEvent:event];
    [self setNeedsDisplay];
    [self performSelector:@selector(hesitateUpdate) withObject:nil afterDelay:0.1];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];
    [self setNeedsDisplay];
    [self performSelector:@selector(hesitateUpdate) withObject:nil afterDelay:0.1];
}

如果你按下按钮并再次释放，这一切都正常工作，但是如果你很快点击它就会调用IBAction，但是没有设置按钮的颜色，它只是快速闪烁白色然后再回到未选中状态颜色...

Answer 1

您可以尝试将[self setNeedsDisplay]移出touchesEnded:withEvent:和touchesCancelled:withEvent:方法，然后转移到hesitateUpdate方法中。

Answer 2

您可以尝试使用UIView的highlighted属性。

如果您希望突出显示，请执行以下操作：

self.highlighted = YES;

反之亦然。

我将UIButton子类化为创建我自己的自定义按钮外观，但它不会重绘所有触摸事件

2 个答案: