如何重绘只有一个特定的图层? (IOS,SWIFT) [英] how to redraw only one specific layer ? (IOS,SWIFT)
问题描述
我有我的 UIView
。我在 UIView
中画了一些东西。我向 UIView
添加了一个 CALayer
。现在我想让我的控制器只重绘我添加的CALayer。
我该如何做?
我的实际代码将重新绘制主视图。如何重绘我的子视图(myshapelayer)?
重写func drawRect(rect:CGRect){
var myshapelayer:CAShapeLayer = CAShapeLayer();
var testbezier:UIBezierPath = UIBezierPath();
testbezier.moveToPoint(CGPoint(x:60,y:80));
...
...
myshapelayer.strokeColor = UIColor.blueColor()。CGColor;
myshapelayer.path = testbezier.CGPath;
newlayer.addSublayer(myshapelayer)
<在我的主视图上绘制>
控制器:
myview.setNeedsDisplay();
有两种方法。
$ b
首先,创建委托协议,并通过 CALayer
更改 ViewController
其次,您可以使用 self.view.subviews $ c获得
CALayer
$ c
如果 CALayer
的索引为1,您可以通过<$ c获得 CALayer
对象$ c> self.view.subviews [1]为? CALayer
希望它对您有所帮助。
I have my UIView
. I draw something in my UIView
. I added a CALayer
to my UIView
. Now I would like my controller to only redraw my added CALayer.
How do I do that ?
In my actual Code it will redraw the main view. How can I redraw my subview (myshapelayer) ?
override func drawRect(rect: CGRect) {
var myshapelayer:CAShapeLayer=CAShapeLayer();
var testbezier:UIBezierPath=UIBezierPath();
testbezier.moveToPoint(CGPoint(x: 60, y: 80));
...
...
myshapelayer.strokeColor=UIColor.blueColor().CGColor;
myshapelayer.path=testbezier.CGPath;
newlayer.addSublayer(myshapelayer)
<draw on my main view>
Controller:
myview.setNeedsDisplay();
There are two ways.
First, you make delegate protocol and pass your CALayer
to change in ViewController
Second, you can get CALayer
by using self.view.subviews
if CALayer
's index is 1, you can get CALayer
object by self.view.subviews[1] as? CALayer
Hope that it may help you.
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