iphone开发-UIRotationGestureRecognizer（顺时针&计数器顺时针检测）？

发布于 2024-11-15 18:14:27 字数 302 浏览 1 评论 0原文

有没有办法检测用户所做的旋转是顺时针还是逆时针直接？？？

我搜索过但找不到答案！

我的代码如下所示：

 UIGestureRecognizer *recognizer;
 recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(spin)];
 [self.rotating addGestureRecognizer:recognizer];
 [recognizer release];

原文

Is there a way to detect if the rotation done by the user is in clockwise or counter clockwise direct???

I searched for that but couldn't find an answer !

My code looks like this:

 UIGestureRecognizer *recognizer;
 recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(spin)];
 [self.rotating addGestureRecognizer:recognizer];
 [recognizer release];

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瞄了个咪的 2024-11-22 18:14:27

rotation 属性会告诉您旋转，以弧度为单位。负值表示顺时针旋转，正值表示逆时针旋转。

例子：

UIGestureRecognizer *recognizer;
recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(spin:)];  // <-- Note the colon after the method name
[self.rotating addGestureRecognizer:recognizer];
[recognizer release];

- (void)spin:(UIGestureRecognizer *)gestureRecognizer {
    CGFloat rotation = gestureRecognizer.rotation;
    if (rotation < 0) {
        // clockwise
    } else {
        // counter-clockwise
    }
}

the rotation property will tell you the rotation in radians. A negative value would indicate the rotation is clockwise, and a positive value indicates counter-clockwise.

Example:

UIGestureRecognizer *recognizer;
recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(spin:)];  // <-- Note the colon after the method name
[self.rotating addGestureRecognizer:recognizer];
[recognizer release];

- (void)spin:(UIGestureRecognizer *)gestureRecognizer {
    CGFloat rotation = gestureRecognizer.rotation;
    if (rotation < 0) {
        // clockwise
    } else {
        // counter-clockwise
    }
}

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太阳公公是暖光 2024-11-22 18:14:27

Swift 版本 - 假设您已将 UIRotationGestureRecognizer 连接到 IBAction 并传入 UIRotationGestureRecognizer 作为参数recognizer。您可以使用以下方法轻松测试方向：

if recognizer.rotation < 0 {
    print("Negative rotation value means anticlockwise rotation detected")
} else if recognizer.rotation > 0 {
    print("Positive rotation value means clockwise rotation detected")
}

Swift version - imagine you've connected your UIRotationGestureRecognizer to an IBAction and are passing in the UIRotationGestureRecognizer as argument recognizer. You could very easily test direction with the following:

if recognizer.rotation < 0 {
    print("Negative rotation value means anticlockwise rotation detected")
} else if recognizer.rotation > 0 {
    print("Positive rotation value means clockwise rotation detected")
}

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