我不想检查我的url statusCode是否等于200,如果statusCode等于200,我创建了一个返回布尔函数的函数,我正在使用dataTask,但我不知道如何返回一个值：
class func checkUrl(urlString: String) -> Bool{
let urlPath: String = urlString
var url: NSURL = NSURL(string: urlPath)!
var request: NSURLRequest = NSURLRequest(url: url as URL)
var response: URLResponse?
let session = Foundation.URLSession.shared
var task = session.dataTask(with: request as URLRequest,completionHandler: {(data,response,error) in
if let error = error {
print(error)
}
if let data = data{
print("data =\(data)")
}
if let response = response {
print("url = \(response.url!)")
print("response = \(response)")
let httpResponse = response as! HTTPURLResponse
print("response code = \(httpResponse.statusCode)")
if httpResponse.statusCode == 200{
return true
} else {
return false
}
}
})
task.resume()
}
if else中的返回值返回错误：
Unexpected non-void return value in void function
为了返回值,你应该使用块.尝试声明你的功能如下：
class func checkUrl(urlString: String,finished: ((isSuccess: Bool)->Void) {
let urlPath: String = urlString
var url: NSURL = NSURL(string: urlPath)!
var request: NSURLRequest = NSURLRequest(url: url as URL)
var response: URLResponse?
let session = Foundation.URLSession.shared
var task = session.dataTask(with: request as URLRequest,error) in
if let error = error {
print(error)
}
if let data = data{
print("data =\(data)")
}
if let response = response {
print("url = \(response.url!)")
print("response = \(response)")
let httpResponse = response as! HTTPURLResponse
print("response code = \(httpResponse.statusCode)")
if httpResponse.statusCode == 200{
finished(isSuccess: true)
} else {
finished(isSuccess: false)
}
}
})
task.resume()
}
然后像这样调用它：
checkUrl("http://myBestURL.com",finished { isSuccess in
// Handle logic after return here
})
希望这会有所帮助.
