为什么我的NSURLConnection委托方法没有被调用?

时间:2012-07-05 03:56:10

标签: xcode multithreading nsurlconnection delegation

我完全按照this official documentation的指示完成了。我为测试目的创建了一个控制台项目。然后我创建了一个名为RequestSender的类(参见下面的代码),并在main函数中创建了这个类的实例。

RequestSender.h:

#import <Foundation/Foundation.h>
@interface RequestSender : NSObject <NSURLConnectionDelegate> {
    NSMutableData* d;
}
@end

RequestSender.m:

#import "RequestSender.h"

@implementation RequestSender

- (id)init {
    self = [super init];
    if (self) {
        NSString* s = @"http://www.apple.com/";
        NSURL* u = [[NSURL alloc] initWithString:s];
        NSURLRequest* r = [[NSURLRequest alloc] initWithURL:u];
        NSURLConnection* c = [[NSURLConnection alloc] initWithRequest:r delegate:self];
        if (c) {
            d = [NSMutableData data];
        }

        return self;
    } else {
        return nil;
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [d setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [d appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
}


@end

毫无疑问,这将在主线程和默认运行循环中执行。但是,不调用委托方法。

我做了很多测试并阅读了很多帖子,但我仍然没有线索。

请帮帮我。这让我很生气。 感谢名单!

1 个答案:

答案 0 :(得分:0)

我相信你错过了开始连接的部分。连接类为此提供了另一种方法,或者您可以从“c”对象中调用它。

NSURLConnection* c = [[NSURLConnection alloc] initWithRequest:r delegate:self];
if (c) {
    d = [NSMutableData data];
    [c start];
}

NSURLConnection* c = [[NSURLConnection alloc] initWithRequest:r delegate:self startImmediately:YES];
if (c) {
    d = [NSMutableData data];
}