如何创建一个函数以在我的应用程序视图中显示评论 (Swift-JSON)
How to create a function to show reviews in a view of my application (Swift-JSON)
我正在关注 https://developers.google.com/places/web-service/details 此文档以添加有关某个地点的所有信息,例如添加 "geometry"
"geometry" : {
"location" : {
"lat" : -33.866651,
"lng" : 151.195827
},
我在 class 中创建了这个功能,效果很好
private let geometryKey = "geometry"
private let locationKey = "location"
private let latitudeKey = "lat"
private let longitudeKey = "lng"
class EClass: NSObject {
var location: CLLocationCoordinate2D?
init(placeInfo:[String: Any]) {
placeId = placeInfo["place_id"] as! String
// coordinates
if let g = placeInfo[geometryKey] as? [String:Any] {
if let l = g[locationKey] as? [String:Double] {
if let lat = l[latitudeKey], let lng = l[longitudeKey] {
location = CLLocationCoordinate2D.init(latitude: lat, longitude: lng)
}
}
}
}
但是我很难添加 "reviews"
"reviews" : [
{
"author_name" : "Robert Ardill",
"author_url" : "https://www.google.com/maps/contrib/106422854611155436041/reviews",
"language" : "en",
"profile_photo_url" : "https://lh3.googleusercontent.com/-T47KxWuAoJU/AAAAAAAAAAI/AAAAAAAAAZo/BDmyI12BZAs/s128-c0x00000000-cc-rp-mo-ba1/photo.jpg",
"rating" : 5,
"relative_time_description" : "a month ago",
"text" : "Awesome offices. Great facilities, location and views. Staff are great hosts",
"time" : 1491144016
}
],
我试着遵循我为几何创建的函数的相同概念,就像这样
if let t = place.details?["reviews"] as? [String:Any] {
if let n = t["author_name"], let m = t["text"] {
Mylabel.text = "\(t)"
}
但是没有用,我也试过加断点,只有第一行进入。我能做什么?我如何创建一个构建来显示带有标签或任何我需要的评论?
在您的代码中,t
不是 Dictionary
,而是 Array
。所以尝试做这样的事情。其余的您可以根据自己的逻辑进行更改。
if let t = place.details?["reviews"] as? [String:Any] {
for dic in t {
if let n = dic["author_name"], let m = dic["text"] {
Mylabel.text = "\(t)"
}
}
}
是的,但你也可以尝试这样做:
struct reviews: Codable{
var reviews: [review]?
}
struct review: Codable{
var author_name: String?
var author_url: String?
var language: String?
var profile_photo_url: String?
var rating: Int?
var relative_time_description: String?
var text: String?
var time: Int?
}
然后:
if let dict = place.details?["reviews"] as? [String: Any],
let dataToDecode = dict.data(using: .utf8){
do{
let decodedReviews = try JSONDecoder().decode(reviews.self, from: dataToDecode)
// here you have decoded reviews in array
}catch let err{
print(err)
}
}
利用 Swift 中的 Codable
4. 您可以简单地将 JSON 转换为特定结构。例如根据您的 JSON:
let json = """
{
"reviews" : [
{
"author_name" : "Robert Ardill",
"author_url" : "https://www.google.com/maps/contrib/106422854611155436041/reviews",
"language" : "en",
"profile_photo_url" : "https://lh3.googleusercontent.com/-T47KxWuAoJU/AAAAAAAAAAI/AAAAAAAAAZo/BDmyI12BZAs/s128-c0x00000000-cc-rp-mo-ba1/photo.jpg",
"rating" : 5,
"relative_time_description" : "a month ago",
"text" : "Awesome offices. Great facilities, location and views. Staff are great hosts",
"time" : 1491144016
}
]
}
"""
您可以使用以下代码将其转换为 Response
结构:
struct Response: Codable {
struct Review: Codable, CustomStringConvertible {
let text: String
let authorName: String
var description: String {
return "Review text: \(text) authorName: \(authorName)"
}
enum CodingKeys: String, CodingKey {
case text
case authorName = "author_name"
}
}
let reviews: [Review]
}
do {
if let data = json.data(using: .utf8) {
let decoder = JSONDecoder()
let decoded = try decoder.decode(Response.self, from: data)
print(decoded.reviews)
} else {
print("data is not available")
}
} catch (let e) {
print(e)
}
我正在关注 https://developers.google.com/places/web-service/details 此文档以添加有关某个地点的所有信息,例如添加 "geometry"
"geometry" : {
"location" : {
"lat" : -33.866651,
"lng" : 151.195827
},
我在 class 中创建了这个功能,效果很好
private let geometryKey = "geometry"
private let locationKey = "location"
private let latitudeKey = "lat"
private let longitudeKey = "lng"
class EClass: NSObject {
var location: CLLocationCoordinate2D?
init(placeInfo:[String: Any]) {
placeId = placeInfo["place_id"] as! String
// coordinates
if let g = placeInfo[geometryKey] as? [String:Any] {
if let l = g[locationKey] as? [String:Double] {
if let lat = l[latitudeKey], let lng = l[longitudeKey] {
location = CLLocationCoordinate2D.init(latitude: lat, longitude: lng)
}
}
}
}
但是我很难添加 "reviews"
"reviews" : [
{
"author_name" : "Robert Ardill",
"author_url" : "https://www.google.com/maps/contrib/106422854611155436041/reviews",
"language" : "en",
"profile_photo_url" : "https://lh3.googleusercontent.com/-T47KxWuAoJU/AAAAAAAAAAI/AAAAAAAAAZo/BDmyI12BZAs/s128-c0x00000000-cc-rp-mo-ba1/photo.jpg",
"rating" : 5,
"relative_time_description" : "a month ago",
"text" : "Awesome offices. Great facilities, location and views. Staff are great hosts",
"time" : 1491144016
}
],
我试着遵循我为几何创建的函数的相同概念,就像这样
if let t = place.details?["reviews"] as? [String:Any] {
if let n = t["author_name"], let m = t["text"] {
Mylabel.text = "\(t)"
}
但是没有用,我也试过加断点,只有第一行进入。我能做什么?我如何创建一个构建来显示带有标签或任何我需要的评论?
在您的代码中,t
不是 Dictionary
,而是 Array
。所以尝试做这样的事情。其余的您可以根据自己的逻辑进行更改。
if let t = place.details?["reviews"] as? [String:Any] {
for dic in t {
if let n = dic["author_name"], let m = dic["text"] {
Mylabel.text = "\(t)"
}
}
}
是的,但你也可以尝试这样做:
struct reviews: Codable{
var reviews: [review]?
}
struct review: Codable{
var author_name: String?
var author_url: String?
var language: String?
var profile_photo_url: String?
var rating: Int?
var relative_time_description: String?
var text: String?
var time: Int?
}
然后:
if let dict = place.details?["reviews"] as? [String: Any],
let dataToDecode = dict.data(using: .utf8){
do{
let decodedReviews = try JSONDecoder().decode(reviews.self, from: dataToDecode)
// here you have decoded reviews in array
}catch let err{
print(err)
}
}
利用 Swift 中的 Codable
4. 您可以简单地将 JSON 转换为特定结构。例如根据您的 JSON:
let json = """
{
"reviews" : [
{
"author_name" : "Robert Ardill",
"author_url" : "https://www.google.com/maps/contrib/106422854611155436041/reviews",
"language" : "en",
"profile_photo_url" : "https://lh3.googleusercontent.com/-T47KxWuAoJU/AAAAAAAAAAI/AAAAAAAAAZo/BDmyI12BZAs/s128-c0x00000000-cc-rp-mo-ba1/photo.jpg",
"rating" : 5,
"relative_time_description" : "a month ago",
"text" : "Awesome offices. Great facilities, location and views. Staff are great hosts",
"time" : 1491144016
}
]
}
"""
您可以使用以下代码将其转换为 Response
结构:
struct Response: Codable {
struct Review: Codable, CustomStringConvertible {
let text: String
let authorName: String
var description: String {
return "Review text: \(text) authorName: \(authorName)"
}
enum CodingKeys: String, CodingKey {
case text
case authorName = "author_name"
}
}
let reviews: [Review]
}
do {
if let data = json.data(using: .utf8) {
let decoder = JSONDecoder()
let decoded = try decoder.decode(Response.self, from: data)
print(decoded.reviews)
} else {
print("data is not available")
}
} catch (let e) {
print(e)
}