我有这些处理下载的方法但是初始化NSMutableData时出现错误NSNumber*filesize;NSMutableData*data;-(void)connection:(NSURLConnection*)connectiondidReceiveResponse:(NSURLResponse*)response{filesize=[NSNumbernumberWithUnsignedInteger:[responseexpectedContentLength]];}-(void)connection:(NSURLConnection*)theConnectiondidRecei

我有这种情况array=[[NSMutableArrayalloc]initWithCapacity:4];//inviewDidLoadif(index==0){[arrayinsertObject:objectatIndex:0];}if(index==1){[arrayinsertObject:objectatIndex:1];}if(index==2){[arrayinsertObject:objectatIndex:2];}if(index==3){[arrayinsertObject:objectatIndex:3];}但是如果我按顺序插入对象，一切正常，相反，如果我按以下