如何将代码目标c转换为Swift以保存图像? [英] How to convert code objective c to Swift to save image?

问题描述

我在其他帖子中也看到了这段代码，用于保存图片:

I have seen this code in other post, for save pictures:

  // Create path.
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,      NSUserDomainMask, YES);
 NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];

// Save image.
[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

我正在尝试转换为swift以使用avfoundatioin保存照片，但是我不知道在这里键入NSDocumentDirectory和NSUserDomainMask 如何转换呢?

An d I'm trying convert to swift for save a picture take with avfoundatioin but I dont know type NSDocumentDirectory and NSUserDomainMask here How can convert this??

谢谢！

推荐答案

如下:

let nsDocumentDirectory = NSSearchPathDirectory.DocumentDirectory
let nsUserDomainMask = NSSearchPathDomainMask.UserDomainMask
if let paths = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true) {
    if paths.count > 0 {
        if let dirPath = paths[0] as? String {
            let readPath = dirPath.stringByAppendingPathComponent("Image.png")
            let image = UIImage(named: readPath)
            let writePath = dirPath.stringByAppendingPathComponent("Image2.png") 
            UIImagePNGRepresentation(image).writeToFile(writePath, atomically: true)
        }
    }
}

路径"是AnyObject []，因此您必须检查其元素是否可以转换为String.

"paths" is an AnyObject[], so you have to check that its elements can be converted to String.

自然地，您实际上不会使用"NSDocumentDirectory"作为名称，为了清楚起见，我只是这么做了.

Naturally, you wouldn't actually use "NSDocumentDirectory" as the name, I just did it for clarity.

更新了Xcode 7.2

NSSearchPathForDirectoriesInDomains现在返回[String]而不是[AnyObject]?，因此请使用

NSSearchPathForDirectoriesInDomains now returns [String] rather than [AnyObject]? so use

let nsDocumentDirectory = NSSearchPathDirectory.DocumentDirectory
let nsUserDomainMask = NSSearchPathDomainMask.UserDomainMask
let paths = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true)
if let dirPath = paths.first {
    // ...
}

.stringByAppendingPathComponent也被弃用的事实在此答案中 ...

The fact that .stringByAppendingPathComponent is also deprecated is dealt with in this answer...

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