UIView觸控平滑旋轉

Question

我想知道如何在我的代碼中平滑UITouch。我能夠檢測到我的UIView上的UItouch，但是當我嘗試使用CGAffineTransform旋轉視圖時，它不會平滑地旋轉。我必須按下或長時間手指觸摸iPhone進行這種旋轉。 如何執行平滑旋轉，如Roambi Visualizer應用程序。 感謝您的幫助。

Answer 1

transform是的UIView的動畫屬性，所以你可以使用核心動畫製作平滑旋轉：

CGAffineTransform newTransform = //...construct your desired transform here... 
[UIView animateWithDuration:0.2 
       animations:^{view.transform = newTransform;}]; 

Answer 2

大家好，我發現以下解決我的問題，它在touchesMoved作品對我來說... ..

下面是代碼....

UITouch *touch = [touches anyObject]; 
CGPoint currentLocation = [touch locationInView:self.superview]; 
CGPoint pastLocation = [touch previousLocationInView:self.superview]; 
currentLocation.x = currentLocation.x - self.center.x; 
currentLocation.y = self.center.y - currentLocation.y; 
pastLocation.x = pastLocation.x - self.center.x; 
pastLocation.y = self.center.y - currentLocation.y; 
CGFloat angle = atan2(pastLocation.y, pastLocation.x) - atan2(currentLocation.y, currentLocation.x); 
CGAffineTransform transform = CGAffineTransformMakeRotation(angle); 

// Apply the affine transform 

[[self.superview viewWithTag:ROTATE_VIEW_TAG] setTransform:transform] ; 

Answer 3

這可能是也可能不是死多頭，但也有凸輪的回答幾個小問題。

pastLocation.y = self.center.y - currentLocation.y; 

需求是

pastLocation.y = self.center.y - pastLocation.y; 

如果您正在尋找這樣做在迅速，我用凸輪的答案找出以下幾點：

override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) { 
    var touch: UITouch = touches.first as! UITouch 

    var currentTouch = touch.locationInView(self.view) 
    var previousTouch = touch.previousLocationInView(self.view) 

    currentTouch.x = currentTouch.x - self.view.center.x 
    currentTouch.y = self.view.center.y - currentTouch.y 

    previousTouch.x = previousTouch.x - self.view.center.x 
    previousTouch.y = self.view.center.y - previousTouch.y 

    var angle = atan2(previousTouch.y, previousTouch.x) - atan2(currentTouch.y, currentTouch.x) 

    UIView.animateWithDuration(0.1, animations: {() -> Void in 
     bigCircleView?.transform = CGAffineTransformRotate(bigCircleView!.transform, angle) 
    }) 

}