初始化CGContext上

2017-06-21 67 views 0 likes

let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
let url = NSURL.fileURL(withPath: documentsPath + "/datafile") 
if let context = CGContext(url: url as CFURL) { 
    // stuff  
}

但是，这给我的错误：

Cannot invoke initializer for type 'CGContext' with an argument list of type '(url: CFURL)'

我也试过CGContext(url as CFURL)以及CGContext.init(url as CFURL)

如果我加mediaBox: nil我得到： Ambiguous reference to member 'init(data:width:height:bitsPerComponent:bytesPerRow:space:bitmapInfo:releaseCallback:releaseInfo:)

来源

2017-06-21 Digant C Kasundra

查找文档：https：//developer.apple.com/documentation/coregraphics/cgcontext/1456290-init。初始化程序需要*三个*参数。 –

回答

let url = NSURL.fileURL(withPath: documentsPath + "/datafile") as CFURLRef  
let context = CGPDFContextCreateWithURL(url, nil, nil)

来源

2017-06-21 09:19:24 SimSim

我认为这是可选的出于某种原因。使用CGContext（url，nil，nil） –

初始化CGContext上

回答

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