为什么我在网络通信期间出现随机崩溃 - （在CFRelease中崩溃）？
我正在处理一个处于维护阶段的项目，所以我没有太多自由可以一次性更改一个主要块，而在这方面工作时我会看到模拟器和设备上的这个随机崩溃而应用程序与服务器同步。流动正在 的登录 - ＆GT;将本地数据上传到服务器 - ＆gt;从服务器下载数据。
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。
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;
}
@end
如果有人能指导我正确的方向，那将会有很大的帮助。该项目使用SDK 6.1和部署目标4.3。
//编辑我的问题
目前的实施如下
@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;
相应的.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片
第1部分，共2部分
第2部分，共2部分
2 个答案:
答案 0 :(得分：2)
两条评论：
1）将标题中的recievedData属性类型更改为“retain”（即使它未在代码中用作属性）
2）在你发布NSURLConnection之前，你应该发送它cancel，即[connection cancel]。你在dealloc和reset中释放它。另外，取消你做的第一件事 - 不要预先发布可能由它使用的数据。
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。我修改了你的代码，如下所示，以镜像你的dealloc方法（你不需要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。
答案 1 :(得分：2)
-
使用Zombies乐器运行乐器。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内的深层错误则无法提供帮助。查看您提供的信息是可能的，但不太可能。添加崩溃日志会有所帮助。
-
我将不再使用ivars并切换到使用合成属性。直接ivar访问应该只在init和dealloc中完成 - 在其他地方，使用该属性。
-
确保您有充分的理由实施NSURLConnection委托。如果
sendAsynchronousRequest:queue:completionHandler:满足您的需求，请使用它 - 您不必处理代表的复杂性。我看到发生了大量的崩溃，因为当人们实现connection:didReceiveData:缓冲到NSMutableData实例或者没有正确处理cancel时出错（在调用cancel之后你将不再获得委托回调） - 这可能会阻止您的代表正确清理。 -
我看到您正在为每个请求获取用户名和密码，看起来您正在构建自己的HTTP Basic身份验证标头。 别。 而是使用NSURLCredential来管理身份验证凭据。当NSURLConnection获得身份验证质询时，它将查看NSURLCredentialStorage以应用凭据。这对您的应用程序是无缝的，可以为您节省很多潜在的痛苦。 以下是如何创建和设置凭据的简短示例。您只需要执行一次，而不是每个连接：
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会将凭据永久存储在钥匙串中（如果需要，可以稍后将其删除）。
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