Ios stringByAppendingPathComponent不可用
我的应用程序在Instagram上共享照片,为此,它首先将照片保存在临时目录中:Ios stringByAppendingPathComponent不可用,ios,swift,swift2,Ios,Swift,Swift2,我的应用程序在Instagram上共享照片,为此,它首先将照片保存在临时目录中: let writePath = NSTemporaryDirectory().stringByAppendingPathComponent("instagram.igo") 它在Swift 1.2上工作,但在Swift 2.0上不工作 给定的错误消息是: stringByAppendingPathComponent不可用:请改为在NSURL上使用URLByAppendingPathComponent 它适用于NS
let writePath = NSTemporaryDirectory().stringByAppendingPathComponent("instagram.igo")
它在Swift 1.2
上工作,但在Swift 2.0
上不工作
给定的错误消息是:
stringByAppendingPathComponent不可用:请改为在NSURL上使用URLByAppendingPathComponent
它适用于
NSString
,因此您可以这样使用它:
extension String {
func stringByAppendingPathComponent(path: String) -> String {
let nsSt = self as NSString
return nsSt.stringByAppendingPathComponent(path)
}
}
现在您可以使用此扩展,它将首先将字符串
转换为NSString
,然后执行操作
您的代码将是:
let writePath = NSTemporaryDirectory().stringByAppendingPathComponent("instagram.igo")
以下是其他一些可供使用的方法:
extension String {
var lastPathComponent: String {
return (self as NSString).lastPathComponent
}
var pathExtension: String {
return (self as NSString).pathExtension
}
var stringByDeletingLastPathComponent: String {
return (self as NSString).stringByDeletingLastPathComponent
}
var stringByDeletingPathExtension: String {
return (self as NSString).stringByDeletingPathExtension
}
var pathComponents: [String] {
return (self as NSString).pathComponents
}
func stringByAppendingPathComponent(path: String) -> String {
let nsSt = self as NSString
return nsSt.stringByAppendingPathComponent(path)
}
func stringByAppendingPathExtension(ext: String) -> String? {
let nsSt = self as NSString
return nsSt.stringByAppendingPathExtension(ext)
}
}
引用自
对于swift 3.0:
extension String {
func stringByAppendingPathComponent1(path: String) -> String {
let nsSt = self as NSString
return nsSt.appendingPathComponent(path)
}
}
let writePath = NSTemporaryDirectory().stringByAppendingPathComponent(path: "instagram.igo")
extension String {
var lastPathComponent: String {
return (self as NSString).lastPathComponent
}
var pathExtension: String {
return (self as NSString).pathExtension
}
var stringByDeletingLastPathComponent: String {
return (self as NSString).deletingLastPathComponent
}
var stringByDeletingPathExtension: String {
return (self as NSString).deletingPathExtension
}
var pathComponents: [String] {
return (self as NSString).pathComponents
}
func stringByAppendingPathComponent(path: String) -> String {
let nsSt = self as NSString
return nsSt.appendingPathComponent(path)
}
func stringByAppendingPathExtension(ext: String) -> String? {
let nsSt = self as NSString
return nsSt.appendingPathExtension(ext)
}
}
看起来Swift 2.0中删除了方法
stringByAppendingPathComponent
,因此错误消息建议使用:
let writePath = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent("instagram.igo")
更新:
getDocumentsDirectory.appendingPathComponent("google.com")
URLByAppendingPathComponent()
已被appendingPathComponent()
替换,因此请改为:
let writePath = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("instagram.igo")
只需将字符串包装为
NSString
let writePath = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent("instagram.igo")
请执行以下操作:
(("\(fileName)" as NSString).lastPathComponent as NSString).stringByDeletingPathExtension
适用于swift 2.0
// Get the documents Directory
func documentsDirectory() -> String {
let documentsFolderPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0]
return documentsFolderPath
}
// Get path for a file in the directory
func fileInDocumentsDirectory(filename: String) -> String {
let writePath = (documentsDirectory() as NSString).stringByAppendingPathComponent("Mobile")
if (!NSFileManager.defaultManager().fileExistsAtPath(writePath)) {
do {
try NSFileManager.defaultManager().createDirectoryAtPath(writePath, withIntermediateDirectories: false, attributes: nil) }
catch let error as NSError {
print(error.localizedDescription);
}
}
return (writePath as NSString).stringByAppendingPathComponent(filename)
}
//# MARK: - Save Image in Doc dir
func saveImage (image: UIImage, path: String ) -> Bool{
let pngImageData = UIImagePNGRepresentation(image)
// let jpgImageData = UIImageJPEGRepresentation(image, 1.0) // if you want to save as JPEG
let result = pngImageData!.writeToFile(path, atomically: true)
print("\(result)")
print("\(path)")
return result
}
您可以改为使用URLByAppendingPathComponent()。请注意,应修剪路径字符串以删除“file://”前缀:
let uniqueFileName = NSUUID().UUIDString
let documentsDirectory = getDocumentsDirectoryURL()
if let path = documentsDirectory?.URLByAppendingPathComponent(uniqueFileName) {
var pathString = path.absoluteString
pathString = imagePathString.stringByTrimmingCharactersInSet(NSCharacterSet(charactersInString: "file://"))
}
func getDocumentsDirectoryURL() -> NSURL? {
let fileManager = NSFileManager()
if let docsDirectory = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first {
return docsDirectory
}
return nil
}
对于Swift 3:
let writePath = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(directoryname).path
或者最好创建此扩展:
extension String {
func appendingPathComponent(_ string: String) -> String {
return URL(fileURLWithPath: self).appendingPathComponent(string).path
}
}
extension String
{
var ns: NSString { return self as NSString }
}
用法:
let writePath = NSTemporaryDirectory().appendingPathComponent(directoryname)
Swift 3解决方案:
getDocumentsDirectory.appendingPathComponent("google.com")
下面是一个获取文档目录路径的函数-
func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in:.userDomainMask)
let documentsDirectory = paths[0]
return documentsDirectory
}
如何使用:
getDocumentsDirectory.appendingPathComponent("google.com")
结果:
file:///var/folders/w1/3rcp2fvs1qv43hfsh5876s0h0000gn/T/com.apple.dt.Xcode.pg/containers/com.apple.dt.playground.stub.iOS_Simulator.MyPlayground-7CF9F706-509C-4D4C-997E-AB8FE9E4A6EA/Documents/google.com
斯威夫特4
extension String {
var lastPathComponent: String {
return (self as NSString).lastPathComponent
}
var pathExtension: String {
return (self as NSString).pathExtension
}
var stringByDeletingLastPathComponent: String {
return (self as NSString).deletingLastPathComponent
}
var stringByDeletingPathExtension: String {
return (self as NSString).deletingPathExtension
}
var pathComponents: [String] {
return (self as NSString).pathComponents
}
func stringByAppendingPathComponent(path: String) -> String {
let nsSt = self as NSString
return nsSt.appendingPathComponent(path)
}
func stringByAppendingPathExtension(ext: String) -> String? {
let nsSt = self as NSString
return nsSt.appendingPathExtension(ext)
}
}
如果使用
NSString
路径方法(而不是String
URL方法)是可以接受的,那么使用计算属性或返回其值为NSString
的方法来扩展String
要容易得多(而不是在String
扩展中复制所需的方法):
然后:
swiftStringPath.ns.appendingPathComponent("whateva")
swiftStringPath.ns.deletingPathExtension
我尝试了这个,它解决了问题 之前:
let localPath = documentDirectory.URLByAppendingPathComponent(imageName)
之后:
let localPath = (documentDirectory as NSString).appendingPathComponent(imageName)
如果您打算使用这种设计,您将遇到诸如将空间转换为%20
应用程序%20支持等问题
否,Swift 2.0可以使用stringByAppendingPathComponent
,请参见下面的我的答案。@JeffreyNeo是的,但这不是NSURL
方法,而是NSString
@DánielNagy我是说的“stringByAppendingPathComponent
在Swift 2.0中被删除"实际上,这是正确的,因为在SWIFT 1.2的字符串中有一个名为String ByPyEngPultPultCype的方法,但是Swift 2的字符串没有。NSString不是SWIFT语言的一部分,它是基础框架的一部分。虽然这是一个有效的解决方案,但我还是有一个有效的解决方案。这是Apple删除这些方法的原因-不推荐使用路径来定位资源,应该改用NSURL
s。只需说一下。snippet:String(NSString(String:path)。stringByAppendingPathComponent(imageName))…否则,我完全同意@CharlieMonroe@CharlieMonroe如果真是这样,为什么在SDK中仍然有很多方法不接受URL作为路径?@JorisMans这些方法通常都是较旧的方法(从10.0开始提供,或在10.0之后早期提供).自从引入沙盒以来,就没有办法通过appscope书签等路径传递信息-你需要一个URL。苹果在更新只有少数人使用的API方面很慢。或者你有最近添加的API(过去3-4年)的例子吗?@IulianOnofrei-因为你应该使用checkResourceIsReachable()
或checkPromiseditMisable()
onURL
取而代之。FileManager
仍然是一个ObjC类NSFileManager
,为Swift删除了NS
前缀,并且自OS X 10.0以来就存在fileExistsAtPath
。从那时起,随着应用程序的沙盒化,世界也在不断发展(这在iOS上不太明显),文件可能存在,您可能没有查看它的权限;此外,文件可能在云中,等等。这就是为什么简单的BOOL
方法被URL
更复杂的方法所取代,但语义更正确。酷的一个..String
类没有这个,但是NSString
存在!有意义。