调整旋转 UIView 的子视图大小
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【中文标题】调整旋转 UIView 的子视图大小【英文标题】:Resizing subview of rotated UIView 【发布时间】:2015-08-28 14:56:26 【问题描述】:我创建了一个具有调整大小、旋转和移动功能的 UIView 子类。我有一个 UITextView 作为子视图,它必须与父级一起移动、旋转和调整大小。一切正常,直到我旋转视图,然后调整它的大小;子视图开始出现这样的故障:https://gyazo.com/1341614679ada42311713cd53c1516ec(忽略旋转故障)
是什么导致了这个问题,如何解决?
这是我正在使用调整大小和旋转的代码:
// Resizing
func scale(recognizer: UILongPressGestureRecognizer)
if recognizer.state == UIGestureRecognizerState.Changed
let point = recognizer.locationInView(self)
var wChange = CGFloat(0.0), hChange = CGFloat(0.0)
wChange = point.x - self.prevPoint.x
let wRatioChange = wChange/bounds.size.width
hChange = wRatioChange * bounds.size.height
if abs(wChange) > 50.0 || abs(hChange) > 50.0
self.prevPoint = recognizer.locationOfTouch(0, inView: self)
return
bounds = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width+wChange, bounds.size.height+hChange)
self.prevPoint = recognizer.locationOfTouch(0, inView: self)
update() // Updating subviews frames
func update()
// resizing of other subviews
deleteButton.center.x = self.frame.width - deleteButton.frame.width * 0.5
deleteButton.frame.origin.y = 0
sizeButton.frame.origin.x = self.frame.width - sizeButton.frame.width
sizeButton.frame.origin.y = self.frame.height - sizeButton.frame.height
self.theTextView.frame.size = CGSize(width: self.frame.width - self.deleteButton.frame.width*2*0.66666666,height: self.frame.height - self.deleteButton.frame.height )
//vRotate.frame.origin.x = 0
//vRotate.frame.origin.y = self.frame.height - sizeButton.frame.height
self.theTextView.center = CGPoint(x: self.frame.width/2,y: self.frame.height/2)
updateTextFont(self.theTextView)
self.theTextView.textAlignment = NSTextAlignment.Center
...
旋转功能:
func rotate(recognizer: UIPanGestureRecognizer)
if recognizer.state == .Changed
let ang = atan2(recognizer.locationInView(self.superview).y - center.y, recognizer.locationInView(self.superview).x - center.x)
print(ang)
let angleDiff = self.deltaAngle - ang
self.transform = CGAffineTransformMakeRotation(-angleDiff)
提前致谢!
【问题讨论】:
我想它与变换下的坐标有关。也许您应该使用 CGAffineTransformScale 进行缩放而不是更改框架? 这个链接看起来很有用。变换将改变坐标系,因此您需要将坐标转换回来,进行更改然后重新应用变换。 ***.com/questions/19523487/… 【参考方案1】:好的,我解决了,问题只是我在调整子视图的框架大小时使用了frame
而不是bounds
。例如:
sizeButton.frame.origin.y = self.frame.height - sizeButton.frame.height
应该是
sizeButton.frame.origin.y = self.bounds.height - sizeButton.frame.height
【讨论】:
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