我有一种方法可以从互联网下载许多图像,然后将它们保存到设备。下面是代码:Iphone与NSData分配
-(IBAction) updateImages {
for (x=0; x<[imagesToUpdate count]; x=x+1) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
NSMutableDictionary *tempDic = [dic objectForKey:[imagesToUpdate objectAtIndex:x]];
BOOL newDictionary = [self downloadChartForDictionary:tempDic];
[pool drain];
}
}
-(BOOL) downloadChartForDictionary:(NSMutableDictionary *)dictionary {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
NSMutableDictionary *updatedDictionary = [NSMutableDictionary dictionaryWithDictionary:dictionary];
NSString *downloadString = [NSString stringWithFormat:@"http://www.photo.com/%@_0001.jpg",[updatedDictionary objectForKey:@"PDFName"]];
[updatedDictionary setObject:serverAIRAC forKey:@"airac"];
NSDate *date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = @"MM-dd-y";
NSString *dateString = [formatter stringFromDate:date];
[updatedDictionary setObject:dateString forKey:@"date"];
[formatter release];
NSURL *url = [NSURL URLWithString:downloadString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *savePath = [NSString stringWithFormat:@"%@/%@^%@_%@.jpg",docsPath,serverAIRAC,[updatedDictionary objectForKey:@"airport"],[updatedDictionary objectForKey:@"PDFName"]];
BOOL downloaded = [data writeToFile:savePath atomically:YES];
[pool drain];
return YES;
}
我的问题是,当这个运行时,NSData对象,数据,被分配但永远不会释放,即使updateImages方法完成。在乐器中,每个下载的图像都保持分配。随着每个图像的下载,总分配量不断增加,并最终导致内存不足。仪器不报告与此对象相关的泄漏。
我试过了:[[NSData alloc] initWithContentsOfURL:url],然后释放它,但这没有帮助。
我已经尝试将autorelease池只在updateImages方法中,并且只在downloadChartForDictionary方法中,并且都没有帮助。
我一直停留在这个整天所以任何帮助是极大的赞赏
有什么令人沮丧的是我有另一个控制器几乎完全相同的东西,它完美的作品。 – Brodie 2010-10-09 00:17:54