iOS开发 message sent to deallocated instance问题解决

问题

直接看截图吧

解决方法

1. 活动监视器查看APP 进程号PID

2. terminal里查看问题

使用命令 malloc_history PID address |grep address

PID用进程号代替，address用出错地址代替（xcode报错地址）

3. 直接看最后一行定位到出错位置

贴一下代码吧

self.theWebView.frame = CGRectMake(0, 50, WIDTH1, [UIScreen mainScreen].bounds.size.height - 100);
NSString * htmlStr = nil;
NSData *data=[NSData dataWithContentsOfFile:self.page.pageUrl options:0 error:NULL];
//    NSString *result = [[[NSString alloc] initWithData:[data base64EncodedDataWithOptions:0]  encoding:NSUTF8StringEncoding] autorelease];
NSString *result=[GTMBase64 stringByEncodingData:data];
htmlStr = [AESCrypt decrypt:result password:@"0123456789ABCDEF"];
//    if (self.readingBook.bookId == 0)
//    {
//        htmlStr = [[IYCCommon decodeBase64forFile:self.page.pageUrl] retain];
//    }
//    else
//    {
//        IYCSecurityManager *manager = [[IYCSecurityManager alloc] init];
//        htmlStr = [[manager decryptWithFilePath:self.page.pageUrl] retain];
//        [manager release];
//    }
self.theWebView.dataDetectorTypes = UIDataDetectorTypeNone;
[self.theWebView loadHTMLString:htmlStr baseURL:[NSURL fileURLWithPath:self.page.baseURL isDirectory:YES]];
[htmlStr release];
//    [data release];
//    [result release];
[self.view addSubview:self.theWebView];

到这里基本上可以看出问题了，就是 htnlStr release两次导致的

备注：一直以为是GTMBase64出问题了，花了太多时间在GTMbase64上

备注2：顺便记录一下，AES加密采用AESCrypt，在解密部分要注意解码编码方式

+ (NSString *)decrypt:(NSString *)base64EncodedString password:(NSString *)password
{
NSData *encryptedData = [NSData base64DataFromString:base64EncodedString];
NSData *decryptedData = [encryptedData AES128DecryptedDataWithKey:password];
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
return [[NSString alloc] initWithData:decryptedData encoding:enc];
}