我正在使用以下代码为从我的UIWebView发送的请求设置自定义HTTP标头。问题是我看到页面加载一秒钟然后它进入白色/空白屏幕。我已经测试了不同的URL,但行为是相同的。有什么想法吗?
func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
var headerIsPresent = false
let headerFields = request.allHTTPHeaderFields
for headerField in headerFields?.keys.array as [String] {
if headerField == "X-Test-App" {
headerIsPresent = true
}
}
if headerIsPresent {
return true
} else {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
dispatch_async(dispatch_get_main_queue(), {
let url = request.URL
var newRequest: NSMutableURLRequest = request as NSMutableURLRequest
// set new header
newRequest.addValue("MyValue", forHTTPHeaderField: "X-Test-App")
// reload the request
self.webView.loadRequest(newRequest)
})
})
return false
}
}
答案 0 :(得分:7)
根据David的评论,我使用了以下解决方案:
func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
let headerFields = request.allHTTPHeaderFields
var headerIsPresent = contains(request.allHTTPHeaderFields?.keys.array as [String], "X-Test-App")
if headerIsPresent || navigationType == UIWebViewNavigationType.Other {
return true
} else {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
dispatch_async(dispatch_get_main_queue(), {
let url = request.URL
var newRequest: NSMutableURLRequest = request as NSMutableURLRequest
// set new header
newRequest.addValue("MyValue", forHTTPHeaderField: "X-Test-App")
// reload the request
self.webView.loadRequest(newRequest)
})
})
return false
}
}
答案 1 :(得分:1)
我认为行var headerIsPresent...
存在语法错误可能是由于Swift中更新的字符串字符API?
我使用map
代替array
,然后在结果上调用contains()
。
let headerIsPresent = request.allHTTPHeaderFields?.keys.map({$0}).contains("YOUR_HEADER_NAME")
答案 2 :(得分:1)
如果您正在寻找swift中的代码:
_ = request.allHTTPHeaderFields
let headerIsPresent = request.allHTTPHeaderFields?.keys.contains("doerlist")
if headerIsPresent! || navigationType == UIWebViewNavigationType.other {
return true
} else {
DispatchQueue.global(qos: .background).async {
DispatchQueue.main.async {
let newRequest: NSMutableURLRequest = request as! NSMutableURLRequest
newRequest.addValue("doerlist-a61444ea-6fef-4366-a39e-e029e6d521ef", forHTTPHeaderField: "doerlist")
self.webView.loadRequest(newRequest as URLRequest)
}
}
return false
}