如何将 Array<AnyObject> 转换为空数组变量?
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【中文标题】如何将 Array<AnyObject> 转换为空数组变量?【英文标题】:How do I cast an Array<AnyObject> to an empty array variable? 【发布时间】:2014-09-25 18:32:42 【问题描述】:问题:我无法将字符串数组(类型为“AnyObject”)分配给空数组。
步骤: 1. 获取包含字符串和数组的字典。 2. 通过键“照片”从该字典中获取一个数组。 注意:Xcode 的警告建议我给出显式类型“AnyObject”。 3. 创建一个空数组。 4. 尝试分配(失败)。
let responseDictionary = responseDict as [String : AnyObject]
let ricPhotos:AnyObject = responseDictionary["photos"]!
var thePhotos:Array<AnyObject>?
thePhotos = ricPhotos <--- fails
编译器错误:
...'AnyObject' is not convertible to 'Array<AnyObject>'
问题:如何将 'ricPhotos' 分配给空数组 'thePhotos' 并最好将 'AnyObject' 转换为 'String'?
修订
let responseDictionary = responseDict as [String : AnyObject]
var anyObject: AnyObject? = responseDictionary["photos"]
好的,'anyObject' 看起来是一个字典,里面是 'photo',它是一个数组;如数据所示。 这是一些数据(anyObject):
page = 1;
pages = 1334;
perpage = 100;
photo = (
farm = 3;
"height_m" = 336;
"height_s" = 161;
"height_sq" = 75;
"height_t" = 67;
id = 15166756998;
isfamily = 0;
isfriend = 0;
ispublic = 1;
owner = "127012961@N08";
secret = 053032f300;
server = 2941;
title = "You @NYPL";
"url_m" = "https://farm3.staticflickr.com/2941/15166756998_053032f300.jpg";
"url_s" = "https://farm3.staticflickr.com/2941/15166756998_053032f300_m.jpg";
"url_sq" = "https://farm3.staticflickr.com/2941/15166756998_053032f300_s.jpg";
"url_t" = "https://farm3.staticflickr.com/2941/15166756998_053032f300_t.jpg";
"width_m" = 500;
"width_s" = 240;
"width_sq" = 75;
"width_t" = 100;
,
...etc.
我想获取“照片”数组。但我不能将 'anyObject' 转换为 'Dictionary' 以便下标。我试过了:
var anyObject:Dictionary = responseDictionary["photos"]
但我得到了:
'(String, AnyObject)' 不能转换为 '[String : AnyObject]'
所以我坚持:
var anyObject: AnyObject? = responseDictionary["photos"]
因此,使用 anyObject,我尝试访问“照片”:
let RicPhotos = anyObject["Photo"] as [String : AnyObject]
...我也试过了:
let RicPhotos = anyObject["Photo"] as Array<Dictionary<String,String>>
但我得到了:
'AnyObject?'没有名为“下标”的成员
我可以看到数据,但无法提取到空变量中。 我试图向下转换为特定类型(字典),但编译器拒绝。
必须有一种从字典中获取嵌入数组的严格方法,同时转换为相应的转换(没有“anyObject”)。
有什么想法吗?
【问题讨论】:
【参考方案1】:编辑了我的答案以适合您的编辑...
let responseDictionary = [:] as [String : AnyObject]
var photosDic: AnyObject? = responseDictionary["photos"]
if let photosDic = photosDic as? Dictionary<String, AnyObject>
var photosArray: AnyObject? = photosDic["photo"]
if let photosArray = photosArray as? Array<Dictionary<String, AnyObject>>
//There you go
【讨论】:
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