2

我正在处理我的一个处于维护阶段的项目，所以我没有太多的自由来一次更改一个主要块，在处理这个问题时，我在应用程序时看到模拟器和设备上的随机崩溃与服务器同步。流程正在 登录-> 将本地数据上传到服务器-> 从服务器下载数据。

在此处输入图像描述

我能够调试的唯一一点是我附上的屏幕截图，我无法从中得出很多推论。 在此处输入图像描述

通过自定义类促进网络通信，如下所示

httpClient.h --------

#define TIMEOUT_SEC     30.0

@protocol HttpClientEventHandler_iPhone
@optional
- (void)requestSucceeded;
- (void)requestFailed:(NSError*)error;
@end

@class Reachability;
@interface HttpClient_iPhone : NSObject{
    NSURLConnection *connection;
    NSMutableData *recievedData;
    int statusCode; 
    id delegate;
    Reachability* hostReachable;
    BOOL networkChecked;
}
@property (nonatomic, retain) NSMutableString *previousRequest;
@property (readonly) NSMutableData *recievedData; // XX should be (readonly, retain)
@property (readonly) int statusCode;
@property (nonatomic, assign) id delegate;

+ (NSString*)stringEncodedWithBase64:(NSString*)str;
+ (NSString*) stringOfAuthorizationHeaderWithUsername:(NSString*)username password:(NSString*)password;
- (NSMutableURLRequest*)makeRequest:(NSString*)url;
- (NSMutableURLRequest*)makeRequest:(NSString*)url username:(NSString*)username password:(NSString*)password;
- (void)prepareWithRequest:(NSMutableURLRequest*)request;
- (void)requestGET:(NSString*)url;
- (void)requestPOST:(NSString*)url body:(NSString*)body type:(NSString*)type;
- (void)requestGET:(NSString*)url username:(NSString*)username password:(NSString*)password;
- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password body:(NSString*)body type:(NSString*)type;
- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password bodydata:(NSData*)body contenttype:(NSString*)type;
- (void)uploadImage:(NSString*)requesturl
           username:(NSString*)username
           password:(NSString*)password
          imagename:(NSString*)imagename 
        contenttype:(NSString*)contenttype
          imagedata:(NSData*)imagedata;

- (void)cancelTransaction;
- (void)reset;
- (BOOL)checkNetworkStatus;
@end

//HttpClient.m ------------

#import "HttpClient_iPhone.h"
#import "Base64.h"
#import "Reachability.h"
#import "SyncLiteral.h"

@implementation HttpClient_iPhone

@synthesize recievedData, statusCode;
@synthesize delegate,previousRequest;

- (id)init {
    if (self = [super init]) {
        [self reset];
        delegate = nil;
        networkChecked = NO;
    }
    return self;
}

- (void)dealloc {
    [connection release];
    [recievedData release];
    [super dealloc];
}

- (void)reset {
    [recievedData release];
    recievedData = [[NSMutableData alloc] init];
    [connection release];
    connection = nil;
    statusCode = 0; 
    networkChecked = NO;
}

+ (NSString*)stringEncodedWithBase64:(NSString*)str {
    static const char *tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    const char *s = [str UTF8String];
    int length = [str length];
    char *tmp = malloc(length * 4 / 3 + 4);

    int i = 0;
    int n = 0;
    char *p = tmp;

    while (i < length) {
        n = s[i++];
        n *= 256;
        if (i < length) n += s[i];
        i++;
        n *= 256;
        if (i < length) n += s[i];
        i++;

        p[0] = tbl[((n & 0x00fc0000) >> 18)];
        p[1] = tbl[((n & 0x0003f000) >> 12)];
        p[2] = tbl[((n & 0x00000fc0) >>  6)];
        p[3] = tbl[((n & 0x0000003f) >>  0)];

        if (i > length) p[3] = '=';
        if (i > length + 1) p[2] = '=';
        p += 4;
    }
    *p = '\0';
    NSString *ret = [NSString stringWithCString:(const char*)tmp encoding: NSUTF8StringEncoding];
    free(tmp);
    return ret;
}

#pragma mark - HTTP Request creating methods

- (NSMutableURLRequest*)makeRequest:(NSString*)url {
    NSString *encodedUrl = (NSString*)CFURLCreateStringByAddingPercentEscapes(
                                                                              NULL, (CFStringRef)url, NULL, NULL, kCFStringEncodingUTF8);
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:[NSURL URLWithString:encodedUrl]];
    [request setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];
    [request setTimeoutInterval:TIMEOUT_SEC];
    [request setHTTPShouldHandleCookies:FALSE];
    [encodedUrl release];
    return request;
}

- (NSMutableURLRequest*)makeRequest:(NSString*)url username:(NSString*)username password:(NSString*)password {
    NSMutableURLRequest *request = [self makeRequest:url];
    [request setValue:[HttpClient_iPhone stringOfAuthorizationHeaderWithUsername:username password:password]
   forHTTPHeaderField:@"Authorization"];
    return request;
}

+ (NSString*) stringOfAuthorizationHeaderWithUsername:(NSString*)username password:(NSString*)password {
    return [@"Basic " stringByAppendingString:[HttpClient_iPhone stringEncodedWithBase64:
                                               [NSString stringWithFormat:@"%@:%@", username, password]]];
}

- (void)prepareWithRequest:(NSMutableURLRequest*)request {
    // do nothing (for OAuthHttpClient)
}

#pragma mark -
#pragma mark HTTP Transaction management methods

/* Sending the Http Request for "GET" */
- (void)requestGET:(NSString*)url {

    //Reseting the http client
    [self reset];

    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSMutableURLRequest *request = [self makeRequest:url];
    [self prepareWithRequest:request];

    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"GET Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"\n\n\n"];

    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}

/* Sending the Http Request for "POST" */
- (void)requestPOST:(NSString*)url body:(NSString*)body type:(NSString*)type {

    //Reseting the http client
    [self reset];
    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSMutableURLRequest *request = [self makeRequest:url];
    [request setHTTPMethod:@"POST"];
    if (type != nil && ![type isEqualToString:@""])
        [request setValue:type forHTTPHeaderField:@"Content-Type"]; 
    if (body) {
        [request setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
    }
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Post Data - %@\n",body];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

/* Sending the Http Request for "GET" with username and password */
- (void)requestGET:(NSString*)url username:(NSString*)username password:(NSString*)password {
    //Reseting the http client
    [self reset];

    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSMutableURLRequest *request = [self makeRequest:url username:username password:password];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Authorization user - %@\n",username];
    [self.previousRequest appendFormat:@"Authorizating password - %@\n",password];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}

/* Sending the Http Request for "POST" with username and password */
- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password body:(NSString*)body type:(NSString*)type {
    //Reseting the http client
    [self reset];
    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSMutableURLRequest *request = [self makeRequest:url username:username password:password];
    [request setHTTPMethod:@"POST"];
    if (type != nil && ![type isEqualToString:@""])
        [request setValue:type forHTTPHeaderField:@"Content-Type"]; 
    if (body) {
        [request setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
    }
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Authorization user - %@\n",username];
    [self.previousRequest appendFormat:@"Authorizating password - %@\n",password];
    [self.previousRequest appendFormat:@"Post Data - %@\n",body];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

/* Sending the Http Request for "POST" with username and password */
- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password bodydata:(NSData*)body contenttype:(NSString*)type {
    //Reseting the http client
    [self reset];
    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSMutableURLRequest *request = [self makeRequest:url username:username password:password];
    [request setHTTPMethod:@"POST"];
    if (type != nil && ![type isEqualToString:@""])
        [request setValue:type forHTTPHeaderField:@"Content-Type"]; 
    if (body) {
        [request setHTTPBody:body];
    }
    if (body != nil && [body length] > 0){
        NSString* length_str = [NSString stringWithFormat:@"%d", [body length]];
        [request setValue:length_str forHTTPHeaderField:@"Content-Length"];
    }
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Authorization user - %@\n",username];
    [self.previousRequest appendFormat:@"Authorizating password - %@\n",password];
    [self.previousRequest appendFormat:@"Post Data - %@\n",[[[NSString alloc] initWithData:body encoding:NSUTF8StringEncoding]autorelease]];
    [self.previousRequest appendFormat:@"\n\n\n"];

    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

/* Sending the Http Request for uploading the image from database */
- (void)uploadImage:(NSString*)requesturl
           username:(NSString*)username
           password:(NSString*)password
          imagename:(NSString*)imagename 
        contenttype:(NSString*)contenttype
          imagedata:(NSData*)imagedata {

    //Reseting the http client
    [self reset];

    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    //Sending the http requqest
    NSString *boundary = @"---------------------------14737809831466499882746641449"; 
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary]; 
    NSURL *url = [NSURL URLWithString:requesturl];

    NSMutableURLRequest *request = [self makeRequest:requesturl username:username password:password];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    NSMutableData *postbody = [NSMutableData data]; 
    [postbody appendData:[[NSString stringWithFormat:@"--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"uploadfile\"; filename=\"%@\"\r\n", imagename] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postbody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
    NSData* encoded_data = [Base64 encode:imagedata];
    [postbody appendData:[NSData dataWithData:encoded_data]];
    [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    [encoded_data release];
    [request setHTTPBody:postbody]; 
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

/* Canceling the HTTP Transaction */
- (void)cancelTransaction {
    [connection cancel];
    [self reset];
}

#pragma mark -
#pragma mark NSURLConnectionDelegate methods

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
    return nil;
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    statusCode = [(NSHTTPURLResponse*)response statusCode];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [recievedData appendData:data];
#ifdef _DEBUG
    NSLog(@"Receieved the http body data : \n%@\n", [[[NSString alloc] initWithData:data 
                                        encoding:NSASCIIStringEncoding] autorelease]);
#endif
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
#ifdef DEBUG
    NSLog(@"Receieved the http body data : \n%@\n", [[[NSString alloc] initWithData:recievedData
                                                                           encoding:NSASCIIStringEncoding] autorelease]);
#endif
    if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestSucceeded)]){
        [self.delegate performSelector:@selector(requestSucceeded) withObject:nil];
    }
    [self reset];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*) error {
#ifdef _DEBUG   
    NSLog(@"didFailWithError \n %@",[error description]);
#endif
    if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
        [self.delegate performSelector:@selector(requestFailed:) withObject:error];
    }   
    [self reset];
}

//check network status chages
- (BOOL)checkNetworkStatus {
    BOOL result = NO;
    Reachability* reachability = [Reachability reachabilityWithHostName:SERVER_ADDRESS];
    NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];  

    if(remoteHostStatus == NotReachable) { 
#ifdef _DEBUG       
        NSLog(@"\nNetwork Status : not reachable\n");
#endif
        result = NO;
    }else if (remoteHostStatus == ReachableViaWWAN) { 
#ifdef _DEBUG       
        NSLog(@"\nNetwork Status : reachable via wwan\n");
#endif
        result = YES;
    }else if (remoteHostStatus == ReachableViaWiFi) { 
#ifdef _DEBUG
        NSLog(@"\nNetwork Status : reachable via wifi\n");
#endif
        result = YES;       
    }
    return result;
}

@结尾

如果有人可以指导我正确的方向，那将有很大的帮助。该项目使用 SDK 6.1 和部署目标 4.3。

// 编辑我的问题

目前的实现如下

@interface HttpClient_iPhone : NSObject{
    NSURLConnection *connection;
    NSMutableData *recievedData;
    int statusCode; 
    id delegate;
    Reachability* hostReachable;
    BOOL networkChecked;
}

@property (retain,atomic) NSMutableString *previousRequest;
@property (retain,readonly) NSMutableData *recievedData;
@property (readonly) int statusCode;
@property (nonatomic, assign) id delegate;

它对应的 .m 现在是

@implementation HttpClient_iPhone

@synthesize recievedData, statusCode;
@synthesize delegate,previousRequest;

- (id)init {
    if (self = [super init]) {
        [self reset];
        delegate = nil;
        networkChecked = NO;
    }
    return self;
}

- (void)dealloc {
    if (connection) {
        [connection cancel];
    }
    [connection release];
    connection = nil;

    if (recievedData) {
        [recievedData release];
        recievedData = nil;
    }
    [super dealloc];
}

- (void)reset {
    if (recievedData) {
        [recievedData release];
        recievedData = nil;
    }

    recievedData = [[NSMutableData alloc] init];

    if (connection) {
        [connection cancel];
        [connection release];
        connection = nil;
    }
    statusCode = 0;
    networkChecked = NO;
}

- (void)requestGET:(NSString*)url {

    //Reseting the http client
    [self reset];

    //Checking the internet connection
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }

    NSMutableURLRequest *request = [self makeRequest:url];
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"GET Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"\n\n\n"];

    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}

- (void)requestPOST:(NSString*)url body:(NSString*)body type:(NSString*)type {
    [self reset];
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    NSMutableURLRequest *request = [self makeRequest:url];
    [request setHTTPMethod:@"POST"];
    if (type != nil && ![type isEqualToString:@""])
        [request setValue:type forHTTPHeaderField:@"Content-Type"]; 
    if (body) {
        [request setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
    }
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Post Data - %@\n",body];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)requestGET:(NSString*)url username:(NSString*)username password:(NSString*)password {
    [self reset];
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    NSMutableURLRequest *request = [self makeRequest:url username:username password:password];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Authorization user - %@\n",username];
    [self.previousRequest appendFormat:@"Authorizating password - %@\n",password];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}

- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password body:(NSString*)body type:(NSString*)type {
    [self reset];
    if ([self checkNetworkStatus] == NO){
        if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
            [self.delegate performSelector:@selector(requestFailed:) withObject:nil];
        }       
        return;
    }
    NSMutableURLRequest *request = [self makeRequest:url username:username password:password];
    [request setHTTPMethod:@"POST"];
    if (type != nil && ![type isEqualToString:@""])
        [request setValue:type forHTTPHeaderField:@"Content-Type"]; 
    if (body) {
        [request setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
    }
    [self prepareWithRequest:request];
    if(![[url lastPathComponent] isEqualToString:@"pda_errorlogs"])
        self.previousRequest = [NSMutableString string];
    [self.previousRequest appendFormat:@"Post Requested API - %@\n",url];
    [self.previousRequest appendFormat:@"Authorization user - %@\n",username];
    [self.previousRequest appendFormat:@"Authorizating password - %@\n",password];
    [self.previousRequest appendFormat:@"Post Data - %@\n",body];
    [self.previousRequest appendFormat:@"\n\n\n"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)requestPOST:(NSString*)url username:(NSString*)username password:(NSString*)password bodydata:(NSData*)body contenttype:(NSString*)type {
    [self reset];
}

- (void)cancelTransaction {
    [self reset];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    statusCode = [(NSHTTPURLResponse*)response statusCode];
}

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

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestSucceeded)]){
        [self.delegate performSelector:@selector(requestSucceeded) withObject:nil];
    }
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*) error {
    if (self.delegate != nil && [self.delegate respondsToSelector:@selector(requestFailed:)]){
        [self.delegate performSelector:@selector(requestFailed:) withObject:error];
    }   
}

// Crashlytics 上报告的崩溃日志图像

第 1 部分，共 2 部分 在此处输入图像描述

第 2 部分，共 2 部分 在此处输入图像描述

4

2 回答 2

2

两条评论：

1) 将标头中的 recievedData 属性类型更改为“保留”（即使它没有在您的代码中用作属性）

2) 在你发布一个 NSURLConnection 之前，你应该发送它cancel，即[connection cancel]。你在 dealloc 和 reset 中释放它。另外，首先要取消它-不要事先发布可能被它使用的数据。

编辑：根据您当前的代码，您的reset方法在修改可变数据之前仍然会取消。我修改了您的代码，如下所示，以反映您的dealloc方法（您不需要 nil 语句）：

- (void)reset {
    if (connection) {
        [connection cancel];
        [connection release];
        connection = nil;
    }
    if (recievedData) {
        [recievedData release];
        recievedData = nil;
    }

    recievedData = [[NSMutableData alloc] init];

    statusCode = 0;
    networkChecked = NO;
}

- (void)dealloc {
    if (connection) {
        [connection cancel];
        [connection release];
    }

    if (recievedData) {
        [recievedData release];
    }
    [super dealloc];
}

试试看。

于 2013-05-17T13:15:10.370 回答
2

  1. 使用 Zombies 仪器运行仪器。大多数情况下，这将为您提供解决此类问题所需的一切，但有时如果您遇到框架深处的错误，它并没有多大帮助。查看您提供的可能但不太可能的信息。添加崩溃日志会有所帮助。

  2. 我会放弃使用 ivars 并转而使用合成属性。直接 ivar 访问只能在 init 和 dealloc 中完成 - 在其他任何地方，使用该属性。

  3. 确保你有充分的理由来实现一个 NSURLConnection 委托。如果sendAsynchronousRequest:queue:completionHandler:满足您的需求，请使用它 - 您不必处理委托的复杂性。我已经看到很多崩溃的发生是由于人们在实现connection:didReceiveData:缓冲到 NSMutableData 实例时所犯的错误，或者没有cancel正确处理（在调用取消之后，您将不再获得任何委托回调 - 这可能会阻止您的委托正确清理）。

  4. 我看到您为这些请求中的每一个都使用了用户名和密码，看起来您正在构建自己的 HTTP Basic 身份验证标头。不。而是使用 NSURLCredential 来管理身份验证凭据。当 NSURLConnection 收到身份验证质询时，它将查看 NSURLCredentialStorage 以获取要应用的凭据。这与您的应用程序是无缝的，将为您节省很多潜在的痛苦。以下是有关如何创建和设置凭据的简短示例。您只需执行一次，而不是针对每个连接：

    NSURLCredential         *credential         = nil;
NSURLProtectionSpace    *protectionSpace    = nil;

protectionSpace = [[NSURLProtectionSpace alloc] initWithHost:[url host] port:[[url port] integerValue] protocol:[url scheme] realm:nil authenticationMethod:NSURLAuthenticationMethodHTTPBasic];
credential = [NSURLCredential credentialWithUser:username password:password persistence:NSURLCredentialPersistencePermanent];
[[NSURLCredentialStorage sharedCredentialStorage] setDefaultCredential:credential forProtectionSpace:protectionSpace];
[protectionSpace release];

请注意，您可以使用不同的持久性选项，NSURLCredentialPersistencePermanent将凭证永久存储在钥匙串中（如果需要，您可以稍后将其删除）。

于 2013-07-24T19:01:47.600 回答