NSURLConnection Delegate 未被调用

Question

我是 iOS 世界的另一个新手，我一直在试图弄清楚 NSURLConnection 是如何与它的代理一起工作的。我运气不太好。在网上浏览了几个例子后，我创建了以下测试类。我遇到的问题是我的委托方法都没有被调用过。我的超时循环存在，每个都显示没有跟踪消息。我已经通过 tcpmon 运行了它，可以看到请求发出并发送回响应，但没有任何东西传递给我的委托。

谁能告诉我我做错了什么。

谢谢。

这是我的代码：

TestRequest.h

#import <Foundation/Foundation.h>

@interface TestRequester : NSObject <NSURLConnectionDataDelegate>

@property BOOL finished;

-(void)testRequest;
@end

以及实现：

#import "TestRequester.h"

@implementation TestRequester

-(void)testRequest {

    NSString *url = @"<your favourite URL>";
    NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                                cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                timeoutInterval:60.0];
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES];
    if (theConnection) {
        NSLog(@"Connection created.  Waiting....");
        int count = 20;
        while (!_finished && count-- > 0)
            [NSThread sleepForTimeInterval:0.5];
        if (_finished)
            NSLog(@"Request completed");
        else
            NSLog(@"Request did not complete");
    } else {
        NSLog(@"Connection was not created!");
    }

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSLog(@"-------------> Received data");
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"-------------> Received response");
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"-------------> connectionDidFinishLoading");
    _finished = YES;
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"-------------> Received error");
    _finished = YES;
}

@end

Answer 1

您需要在标题中将连接委托设置为 NSURLConnectionDelegate 而不是 NSURLConnectionDataDelegate 类型。据我所知。

@interface TestRequester : NSObject <NSURLConnectionDelegate>

请参阅本页连接协议下的部分 :) https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html#//apple_ref/doc/c_ref/NSURLConnection

Answer 2

您的连接似乎超出了范围。您可能正在使用 ARC。

TestRequest.h

#import <Foundation/Foundation.h>

@interface TestRequester : NSObject <NSURLConnectionDelegate>
{
    NSURLConnection *theConnection;
}
@property BOOL finished;

-(void)testRequest;
@end

-(void)testRequest {

NSString *url = @"<your favourite URL>";
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                            cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                            timeoutInterval:60.0];
theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES];
if (theConnection) {
    NSLog(@"Connection created.  Waiting....");
    /*int count = 20;
    while (!_finished && count-- > 0)
        [NSThread sleepForTimeInterval:0.5];
    if (_finished)
        NSLog(@"Request completed");
    else
        NSLog(@"Request did not complete");*/
} else {
    NSLog(@"Connection was not created!");
}

}