解析陣列圖像保存和提取

Question

我有一個馬賽克應用程序，需要多個尺寸的照片，並將它們分成較小的照片。根據照片的大小，較小的照片數量可能會有所不同。現在我有一個名爲imageNameList2的NSMutableArray，它保存從較大圖像獲取的所有較小圖像。在這個例子中，我展示了一個例子，從圖片資源列表中調用圖片，以便於回答這個問題。

這裏是imageNameList（NSMutableArray持有的所有小圖片）

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 
} 

我想要做的是有一個繼續按鈕，將爲了把這些圖像保存爲piffles或任何其他形式解析這個效果最好，並有另一個按鈕稱爲檢索，將從解析中檢索所有這些照片。我基本上有一個分析服務器，利用分析框架來幫助加快後端進程。如果每次存儲的圖像數量不同，您能否告訴我如何保存並檢索此NSMutableArray？

Answer 1

我認爲你正在嘗試做這樣的事情。這只是一個例子。有很多工作要做，但希望這會讓你開始。我沒有運行或測試此代碼。

這個想法是將您的圖像保存爲PFFiles，併爲每個文件創建一個「tile」PFObject。然後將所有「瓷磚」PFObject s保存到圖像PFObject的「瓷磚」鍵。然後在需要時通過objectId回想圖像。

祝你好運。

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 
      }) 
     } 
    }) 
}