Question

所以，我已经工作了几个小时试图解决这个问题，我认为可能只是缺少一些如此明显的东西。

我想做的是有一条线的动画（就像时钟秒针）顺时针旋转，但是当屏幕被按下时，它会停止，但是当再次按下时它再次启动但是旋转反转并且线开始逆时针旋转...

这是我用来围绕固定点旋转线的代码，它可以工作：

- (void) spinWithOptions: (UIViewAnimationOptions) options {
        [UIView animateWithDuration: 0.0f
                              delay: 0.0f
                            options: options
                         animations: ^{
                             Hand.layer.anchorPoint = CGPointMake(0.5,1);
                             Hand.transform = CGAffineTransformRotate(Hand.transform, M_PI / 40);
                         }
                         completion: ^(BOOL finished) {
                             if (finished) {
                                 if (animating) {
                                     // if flag still set, keep spinning with constant speed
                                     [self spinWithOptions: UIViewAnimationOptionCurveLinear];
                                 } else if (options != UIViewAnimationOptionCurveEaseOut) {
                                     // one last spin, with deceleration
                                     //[self spinWithOptions: UIViewAnimationOptionCurveEaseOut];
                                 }
                             }
                         }];
    }

- (void) startSpin {
    if (!animating) {
        animating = YES;
        [self spinWithOptions: UIViewAnimationOptionCurveEaseIn];
        Clockwise = NO;
    }
}

- (void) spinWithOptions_Anti: (UIViewAnimationOptions) options {
        [UIView animateWithDuration: 0.0f
                              delay: 0.0f
                            options: options
                         animations: ^{
                             Hand.layer.anchorPoint = CGPointMake(0.5,1);
                             Hand.transform = CGAffineTransformRotate(Hand.transform, -M_PI / 40);
                         }
                         completion: ^(BOOL finished) {
                             if (finished) {
                                 if (animating) {
                                     // if flag still set, keep spinning with constant speed
                                     [self spinWithOptions: UIViewAnimationOptionCurveLinear];
                                 } else if (options != UIViewAnimationOptionCurveEaseOut) {
                                     // one last spin, with deceleration
                                     //[self spinWithOptions: UIViewAnimationOptionCurveEaseOut];
                                 }
                             }
                         }];
}

- (void) startSpin_Anti {
    if (!animating) {
        animating = YES;
        [self spinWithOptions_Anti: UIViewAnimationOptionCurveEaseIn];
        Clockwise = YES;
    }
}

- (void) stopSpin {
    animating = NO;
}

因此，在应用程序开始时，当 ViewDidload 调用startSpin时，该行开始顺时针旋转，调用spinWithOptions ...

果然，如果我按下屏幕，旋转动画就会停止，这就是......

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event{
    NSLog(@"Dircetion: %i", Clockwise);

    if(animating){
        [self stopSpin];
    }
    else{
        if(Clockwise){
            [self startSpin];
            NSLog(@"must be clockwise");
        }
        else{
            [self startSpin_Anti];
            NSLog(@"anti");
        }
    }
}

但是当再次按下时它会开始旋转，但它永远不会改变方向......它只能顺时针旋转......

我似乎无法理解为什么它不会改变方向......甚至NSLogs都说顺时针方向的布尔是正确的......

旋转UIImageView，然后在“Tapped＆＃39; （动画）

0 个答案: