Question

我刚刚下载了Incognito starter project，在我打开它之后，我将其转换为最新的Swift语法，因为选项就在那里。之后我收到了linker command failed with exit code 1 (use -v to see invocation)的错误，我尝试使用here中的建议进行修复。它帮助我修复了错误。然后还有另外两个错误：

value of optional type 'NSData?' not unwrapped, did you mean to use '!' or '?'

和此：

value of optional type 'CGContext?' not unwrapped, did you mean to use '!' or '?'

对于此功能：

  func snapshot() -> NSData {
    UIGraphicsBeginImageContext(self.view.frame.size)
    self.view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let fullScreenshot = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(fullScreenshot, nil, nil, nil)
    return UIImageJPEGRepresentation(fullScreenshot, 0.5)
  }

在听完构造函数并修复它之后，结果是：

  func snapshot() -> NSData {
    UIGraphicsBeginImageContext(self.view.frame.size)
    self.view.layer.renderInContext(UIGraphicsGetCurrentContext()!)
    let fullScreenshot = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(fullScreenshot, nil, nil, nil)
    return UIImageJPEGRepresentation(fullScreenshot, 0.5)!
  }

但是现在我得到了和开头一样的错误：

linker command failed with exit code 1 (use -v to see invocation)

任何帮助都会非常感激！

转换为最新的Swift语法后出错

0 个答案: