我试图找到类似的问题，但我无法这样做。我有一个单身人士用于通过我的应用程序收集信息。一旦在以下方法中获得了值。
-(NSString *)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data-(NSString *)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
在这个方法中，我得到了我想要连接的webservice的响应。一切都是好的。但是，任何将变量值保存到我的单例的尝试都会失败。这个方法内没问题。当我尝试进入下一个视图并引用我的单例时，就好像值永远不会被保存。
这是我的代码的骨架。
NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
[jsonResponse setHostedURL:_hostedURL];
此处的目标基本上是让托管付款页面显示在下一个视图中。流动的流程。我只需要传递URI链接，以便付款。
我知道我可以从这个委托方法返回一个值，但由于我从未明确地调用过这个方法，所以我不确定它在哪里被调用。可能是我的值没有被保存在单例类中的原因。
编辑：
现在我有一个视图可以执行所有操作。
//
// NBXViewController.h file
#import <UIKit/UIKit.h>
@interface NBXViewController : UIViewController
//*************************************************
// Variables to be declared for NBXViewController *
//*************************************************
@property (strong, nonatomic) IBOutlet UILabel *storeLabel;
@property (strong, nonatomic) IBOutlet UIButton *purchaseButton;
@property (strong, nonatomic) IBOutlet NSString *hostedURL;
//*************************************************
// Button Action methods for the buttons on View *
//*************************************************
- (IBAction)puchaseButtonAction:(id)sender;
//*************************************************
// Connection Delegate Methods *
//*************************************************
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; // Handle Connection Error
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; // Data Received from Connection (Header Information)
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; //Response from Connection (Return from Hosted being called)
-(void)connectionDidFinishLoading:(NSURLConnection *)connection; // Coonection did finish loading
@end
实施档案。
//
// NBXViewController.m
// HostedAPI
//
// Created by Philip Teoli on 3/1/2014.
// Copyright (c) 2014 Philip Teoli. All rights reserved.
//
#import "NBXViewController.h"
#import "NBXJSONResponse.h"
@interface NBXViewController ()
@end
@implementation NBXViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//****************************************
// PurchaseButton Action Method *
//****************************************
- (IBAction)puchaseButtonAction:(id)sender
{
//************************************
// Building JSON Request *
//************************************
NSString *jsonString = @"Sample Request";
//**************************************
// Convert JSON String to NSData *
//**************************************
NSData* jsonRequestData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
//**************************************
// Creating JSON object to Send *
//**************************************
NSString *jsonRequest = [[NSString alloc] initWithData:jsonRequestData encoding:NSUTF8StringEncoding];
//*****************************************
// Base64 Encoding for Application Header *
//*****************************************
NSString *base64Signature = @"NbMIIkomZ8mFNw97EGRT:NAA5e965731e8a27ab11f5f";
NSString *basic = @"Basic: ";
NSData *base64SignatureData = [base64Signature dataUsingEncoding: NSUTF8StringEncoding];
NSString *base64SignatureEncoded = [base64SignatureData base64EncodedStringWithOptions:0];
NSString *header = nil;
header = [basic stringByAppendingString:base64SignatureEncoded];
// NSLog(@"Encoded Header: %@", header);
//*************************************
// Preparing to send XML through POST *
//*************************************
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[jsonRequest length]]; //Calculating the Content Length
NSData *postData = [jsonRequest dataUsingEncoding:NSUTF8StringEncoding]; // preapring JSON Request to be sent
//**************************************
// Headers and POST Body *
//**************************************
NSURL *serviceUrl = [NSURL URLWithString:@"https://pay.test.ewbservice.com/orders"];
NSMutableURLRequest *serviceRequest=[NSMutableURLRequest requestWithURL:serviceUrl cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60];
[serviceRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
[serviceRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[serviceRequest setValue:header forHTTPHeaderField:@"Authorization"];
[serviceRequest setHTTPMethod:@"POST"];
[serviceRequest setHTTPBody:postData];
NSURLConnection *connection = [[NSURLConnection alloc]
initWithRequest:serviceRequest
delegate:self startImmediately:YES];
[connection scheduleInRunLoop:[NSRunLoop mainRunLoop]
forMode:NSDefaultRunLoopMode];
[connection start];
NSLog(@"Hosted URL in Button: %@", _hostedURL);
}
//****************************************************
// Implementation of Connection Delegate Methods *
//****************************************************
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"did fail");
}
//*******************************************************
// Connection Data Received *
//*******************************************************
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSString *dataResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData: [dataResponse dataUsingEncoding:NSUTF8StringEncoding]
options: NSJSONReadingMutableContainers
error: &error];
//********************************
// Iterating through Dictionary *
//********************************
NSArray *jsonLink = nil;
for(id key in jsonDictionary)
{
if ([key isEqualToString:@"link"])
{
jsonLink = [jsonDictionary objectForKey:key]; // this returns a dictionary. Will need to parse dictionary another 2 times to get proper URI.
}
}
NSDictionary *test = [jsonLink objectAtIndex:0];
for(id key in test)
{
if ([key isEqualToString:@"uri"])
{
_hostedURL = [test objectForKey:key];
}
}
NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
[jsonResponse setHostedURL:_hostedURL];
}
//*******************************************************
// Connection Response Method *
//*******************************************************
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"did receive response: \n %@", response);
NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
[jsonResponse setHostedURL:_hostedURL];
}
//*******************************************************
// Connection Finished Loading Data Method *
//*******************************************************
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"did finish loading!!! \n%@", _hostedURL);
// NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
// [jsonResponse setHostedURL:_hostedURL];
}
@end
请告诉我你的想法。如果需要，我可以发布更多细节。在此先感谢您的帮助！！！
此致
答案 0 :(得分：0)
感谢@rdelmar的大力帮助，我能够度过难关。基本上简而言之，在我之前从Web服务查看收到信息之前，我正在进入下一个视图。因此，当我尝试将带有值的标签更改为我的Singleton时，它尚未存储。我是如何解决这个问题的，当我点击一个按钮时，我等到Web服务响应，然后我添加一个视图转到新视图。现在我正在等待的URL到达我，我将它保存到Singleton然后我转到下一个视图。
我会在抓取并发布后添加我的代码。
再次感谢你的帮助埃里克！您的耐心和帮助使您成为这个社区的好人。
此致 公司一