我有一个马赛克应用程序,可以拍摄多张照片并将其分成较小的照片。根据照片的大小,较小的照片数量可能会有所不同。现在我有一个名为NSMutableArray
的{{1}},其中包含从较大图像中获取的所有较小图像。在这个例子中,我展示了一个示例,其中从图像资源列表中调用图像,以便更容易回答这个问题。
以下是imageNameList2
(imageNameList
,其中包含所有较小的图片)
NSMutableArray
我想要做的是有一个继续按钮,将按顺序保存所有这些图像,因为piffles或任何其他格式的解析效果最好,并有另一个名为retrieve的按钮,将从解析中检索所有这些照片。我基本上有一个解析服务器,它利用解析框架来帮助加速后端进程。如果每次存储的图像数量不同,您能否告诉我如何保存和检索此var imageNameList: [String] {
var imageNameList2:[String] = [] //[NSMutableArray]()
for i in 0...149 {
let imageName = String(format: "pic_%03d", Int(i))
imageNameList2.append(imageName)
}
return imageNameList2
}
?
答案 0 :(得分:0)
我认为你正在尝试做这样的事情。这只是一个例子。还有很多工作要做,但希望这会让你开始。我没有运行或测试此代码。
我们的想法是将您的图片保存为PFFiles
,并为每个文件创建一个“图块”PFObject
。然后将所有“图块”PFObject
保存到图片PFObject
的“图块”键中。然后通过objectId
在需要时调用图像。
let appleTiles = ["apple1, apple2, apple3"]
let orangeTiles = ["orange1, orange2, orange3, orange4, orange5"]
func usage() {
//dont literally run these synchronously like this
post(appleTiles)
post(orangeTiles)
download()
}
func post(_ tileNames: [String]) {
let image = PFObject(className: "Image")
let tilesPF = tileNames.map({ name in
let data = UIImagePNGRepresentation(UIImage(named: name))!
let file = PFFile(data: data)
let tile = PFObject(className: "Tile")
tile["tile"] = file
})
image["tiles"] = tilesPF
image?.saveInBackground(block: { responseObject, error in
//you'll want to save the object ID of the PFObject if you want to retrieve a specific image later
})
}
func download() {
let query = PFQuery(className: "image")
//add this if you have a specific image you want to get
query.whereKey("objectId", equalTo: "someObjectId")
query.findObjectsInBackground({ result, error in
//this is probably close to how you'd unwrap everything but again, I didn't test it so...
if let objects = result as? [PFObject], let first = objects.first, let image = first["image"] as? PFObject, let tiles = image["tiles"] as? [PFObject] {
tiles.forEach({ tile in
let file = tile["tile"]
//now you have an individual PFFile for a tile, do something with it
})
}
})
}