英文:
Gomobile bind delegate/callback behaviour
问题
有人知道是否可以使用gomobile bind，在导出到iOS时实现某种委托行为吗？
例如，我有一个处理iOS应用程序的网络请求的Go库，我需要它以异步方式完成，以免挂起应用程序。
解决方案可以是发送一个Objective-C完成块（我认为这不会起作用，因为我找不到将Objective-C代码发送回Go函数的方法），或者实现某种委托，以便应用程序可以知道请求何时完成。我已经尝试了我能想到的一切...有什么想法吗？谢谢！
英文:
Anyone know if it is possible, using gomobile bind, to implement some sort of delegate behaviour when exporting to iOS?
i.e. i have a go library that handles network requests for an iOS app, and i need it to be done asynchronously so that it doesn't hang the app.
Solutions would be to either send a objc completion block (which i don't think will work, since i have found no way to send objc code back into the go function) or implement some sort of delegate so that the app can know when the request has finished. I have tried everything I could think of... Any ideas? Thanks!
答案1
得分: 2
原来是可以的！
以下是Go代码的翻译：
type NetworkingClient struct {}
func CreateNetworkingClient() *NetworkingClient {
return &NetworkingClient {}
}
type Callback interface {
SendResult(json string)
}
func (client NetworkingClient) RequestJson (countryCode string, callback Callback) {
go func () {
safeCountryCode := url.QueryEscape(countryCode)
url := fmt.Sprintf("someApi/%s", safeCountryCode)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
//处理错误
}
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
//处理错误
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(resp.Body)
callback.SendResult(string(b))
}()
}
以下是Objective-C中的实现：
- (void)start {
...
EndpointNetworkingClient* client = EndpointCreateNetworkingClient();
[client requestJson:countryCode callback:self];
}
//从Go接收json字符串
- (void)sendResult:(NSString*)json{
NSData *data = [json dataUsingEncoding:NSUTF8StringEncoding];
id jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
[self handleResponse:jsonDictionary];
}
希望对你有帮助！
英文:
Turns out it is possible!
Here is the Go Code:
type NetworkingClient struct {}
func CreateNetworkingClient() *NetworkingClient {
return &NetworkingClient {}
}
type Callback interface {
SendResult(json string)
}
func (client NetworkingClient) RequestJson (countryCode string, callback Callback) {
go func () {
safeCountryCode := url.QueryEscape(countryCode)
url := fmt.Sprintf("someApi/%s", safeCountryCode)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
//Handle error
}
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
//Handle error
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(resp.Body)
callback.SendResult(string(b))
}()
}
Which is implemented as follow in Objetive-C:
- (void)start {
...
EndpointNetworkingClient* client = EndpointCreateNetworkingClient();
[client requestJson:countryCode callback:self];
}
//Receives the json string from Go.
- (void)sendResult:(NSString*)json{
NSData *data = [json dataUsingEncoding:NSUTF8StringEncoding];
id jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
[self handleResponse:jsonDictionary];
}
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