无法在Swift中释放CGPathCreateMutable创建的路径 [英] Cannot release path created by CGPathCreateMutable in Swift

问题描述

我在Swift中有以下简单代码：

 重写var bounds：CGRect {
 didSet {
 if（bounds！= oldValue）{
 var path = CGPathCreateMutable（）
 CGPathAddEllipseInRect（path，nil，bounds）
 self.path =路径
 CGPathRelease（path）
} 
} 
} 
  

应该绘制一个填充的圆

这是从我以前的Objective-C代码移植而来的，它工作正常：

 -（void）setBounds：（CGRect）bounds 
 {
 if（CGRectEqualToRect（self。界限，界限））返回； 
 
 super.bounds =界限； 
 CGMutablePathRef路径= CGPathCreateMutable（）; 
 CGPathAddEllipseInRect（path，nil，bounds）; 
 self.path =路径; 
 CGPathRelease（path）; 
} 
  

但是，Swift代码因某些段错误而崩溃。如果我不释放路径，那就很好。如果我未设置 self.path = path ，它也很好（尽管什么也不会出现）。如果两者都存在，则会崩溃。

我确实认为 CGPathCreateMutable（）创建的路径需要虽然被释放了..而ObjC似乎就是这种情况。有人知道为什么它不能在Swift中工作吗？还是我做错了什么？

谢谢！

解决方案

您不需要在Swift中释放CF对象。在您的情况下， CGPathCreateMutable（）返回 CGPath 对象（而不是 CGPathRef ）并由内存管理，与任何swift对象相同。他们在WWDC视频 = a href = https://developer.apple.com/videos/play/wwdc2014/407/ rel = nofollow noreferrer>深度互操作性

I have this simple code in Swift:

override var bounds : CGRect {
  didSet {
    if (bounds != oldValue) {
      var path = CGPathCreateMutable()
      CGPathAddEllipseInRect(path, nil, bounds)
      self.path = path
      CGPathRelease(path)
    }
  }
}

It's supposed to draw a circle that fills the layer when the layer's bounds changes.

This is ported from my old Objective-C code, which works fine:

- (void)setBounds:(CGRect)bounds
{
  if (CGRectEqualToRect(self.bounds, bounds)) return;

  super.bounds = bounds;
  CGMutablePathRef path = CGPathCreateMutable();
  CGPathAddEllipseInRect(path, nil, bounds);
  self.path = path;
  CGPathRelease(path);
}

However, the Swift code crashes with some segfault. If I don't release the path, it's fine. If I don't set self.path = path, it's also fine (although nothing will show up, apparently). If both are present, it will crash.

I do think that a path created by CGPathCreateMutable() needs to be released though.. and that seems to be the case for ObjC. Does anyone know why it doesn't work in Swift? Or did I do anything wrong?

Thanks!

解决方案

You don't need to release CF objects in Swift. In your case, the CGPathCreateMutable() returns a CGPath object (not CGPathRef) and is memory-managed just the same as any swift object. They explained this in the WWDC video Swift Interoperability In Depth

这篇关于无法在Swift中释放CGPathCreateMutable创建的路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！