我正在尝试使用Swift显示和保存图片。在第一次访问时,它会在ImageView上显示远程图片,而在第二次访问时,它会显示空的ImageView,而不是应该显示在第一次访问中保存的本地图片。
var paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
var imagePath = paths.stringByAppendingPathComponent("images/\(id)/logo.jpg" )
var checkImage = NSFileManager.defaultManager()
if (checkImage.fileExistsAtPath(imagePath)) {
let getImage = UIImage(contentsOfFile: imagePath)
self.image?.image = getImage
} else {
dispatch_async(dispatch_get_main_queue()) {
let getImage = UIImage(data: NSData(contentsOfURL: NSURL(string: remoteImage)))
UIImageJPEGRepresentation(getImage, 100).writeToFile(imagePath, atomically: true)
self.image?.image = getImage
}
}
编辑:这个对我有效。
var paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
var dirPath = paths.stringByAppendingPathComponent("images/\(id)" )
var imagePath = paths.stringByAppendingPathComponent("images/\(id)/logo.jpg" )
var checkImage = NSFileManager.defaultManager()
if (checkImage.fileExistsAtPath(imagePath)) {
let getImage = UIImage(contentsOfFile: imagePath)
self.image?.image = getImage
} else {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
checkImage.createDirectoryAtPath(dirPath, withIntermediateDirectories: true, attributes: nil, error: nil)
let getImage = UIImage(data: NSData(contentsOfURL: NSURL(string: remoteImage)))
UIImageJPEGRepresentation(getImage, 100).writeToFile(imagePath, atomically: true)
dispatch_async(dispatch_get_main_queue()) {
self.image?.image = getImage
return
}
}
}
imagePath
变量以确保它是正确的吗?(你也可以使用println(imagePath)
来输出变量值) - Mike SNSFileManager
方法createDirectoryAtPath
。 - Rob