Question

我正在我的应用中创建一个计数器。我希望在发生特定更改时增加它。计数器将其值从0增加到1.然后它会粘到1并且它不会增加。这是我的代码。在.h我做到了。

@interface URLCacheConnection : NSObject {
  int                     counter;

}

并且在.m中它有

-(void) connection:(NSURLConnection *)conn didReceiveResponse:(NSURLResponse *)response {
if ([response isKindOfClass:[NSHTTPURLResponse self]]) {

    printf("[(NSHTTPURLResponse *)response allHeaderFields] = %s\n", [[(NSHTTPURLResponse *)response suggestedFilename] cStringUsingEncoding: 1]);
    NSDictionary *dict = [(NSHTTPURLResponse *)response allHeaderFields];
    NSLog(@"allHeaderFields = %@\n", [dict description]);

    if(downloadItem.downloadStatus != DownloadStatus_resumed)
    {
        if([[NSFileManager defaultManager] fileExistsAtPath: downloadItem.fileItem.filePath]) {
            counter = counter + 1;
            NSLog(@"the value of counter is %d", counter);

            NSString * fileExtension = [downloadItem.fileItem.fileName pathExtension];

            NSString *fileName = [downloadItem.fileItem.fileName  stringByDeletingPathExtension];

            fileName = [fileName stringByAppendingFormat:@"-(%d)", counter]; 
            fileName = [fileName stringByAppendingString:[NSString stringWithFormat:@".%@",fileExtension]];

            downloadItem.fileItem.fileName  = fileName;

            downloadItem.fileItem.filePath = [NSString stringWithFormat:@"%@/%@", downloadItem.fileItem.folderPath, downloadItem.fileItem.fileName];
        }
        else {
            counter = 0;
        }
        BOOL fileCreatedFlag = [[NSFileManager defaultManager] createFileAtPath: downloadItem.fileItem.filePath contents:nil attributes:nil];
        downloadItem.fileItem.fileHandle = [NSFileHandle fileHandleForWritingAtPath: downloadItem.fileItem.filePath];
        fileCreatedFlag = fileCreatedFlag;

    }

}

}

Answer 1

詹姆斯这是因为self.counter会返回一个值而不是变量，因此会打印不同的地址请在上面的评论中提供确切的日志并使用 Keety 建议的日志。

Answer 2

如果恢复下载状态，则将计数器重置为0.如果为了参数起见，每次下载至少恢复一次，那么当您将计数器打印到日志时，计数器将始终为1。

Answer 3

试试这个：

NSInteger counter = 0;
counter = counter+1;
NSLog(@"the address of counter is %p",counter);

NSinteger的地址通过递增来改变

3 个答案: