Cocoa 将NSDictionary的本地声明传递给PerformSelect

它是如何做到不需要在选择器调用方法中正确地放置数据对象的

带有警告的代码（数据的本地声明）：

无警告代码：

[self performSelector:@selector(downloadBinDataForTyp:data:) 
           withObject:@"SiluetaImage" 
           withObject:[NSDictionary dictionaryWithObjectsAndKeys:@"SiluetaImage", @"ACTION", silueta_id, @"siluetaid", siluetaTyp_id, @"siluetatypid", nil]];

选择器：

- (void)downloadBinDataForTyp:(NSString *)typ data:(NSDictionary*)data
{
    ASINetworkQueue *q = [self queue];
    NSString *sUrl = @"url_web_service";

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:sUrl]];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [[self getMsg] length]];

    [request setTimeOutSeconds:60];
    [request addRequestHeader: @"Content-Type" value:@"text/xml; charset=utf-8"];
    [request addRequestHeader: @"SOAPAction" value:_action];
    [request addRequestHeader: @"Content-Length" value:msgLength];
    [request setRequestMethod: @"POST"];
    request.userInfo = data;

    [request appendPostData:[self getMsg]];
    [request setDelegate:self];

    [q addOperation:request];
    [q go];

}

---

在这里，您传递的是

数据

，其范围仅限于方法。在方法之外，它不能被访问，因为它正在获得

release

d.

是的，我得到了它，但是没有办法不被释放吗？因此，该数据将继续进行选择器调用。将其设置为属性或ivar。如果是属性或ivar，它将在我不希望的时间更改。谁将更改？它将如何改变？你是编码员，你知道什么时候改变它。不是吗？我将在创建另一个httpRequest以排队时更改它。嗯，当我使用它来设置httpRequest.userInfo并放入队列时，它不会为该请求更改吗？当我使用相同的属性和不同的值向队列创建另一个请求时，它是否会保存请求的值？

- (void)downloadBinDataForTyp:(NSString *)typ data:(NSDictionary*)data
{
    ASINetworkQueue *q = [self queue];
    NSString *sUrl = @"url_web_service";

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:sUrl]];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [[self getMsg] length]];

    [request setTimeOutSeconds:60];
    [request addRequestHeader: @"Content-Type" value:@"text/xml; charset=utf-8"];
    [request addRequestHeader: @"SOAPAction" value:_action];
    [request addRequestHeader: @"Content-Length" value:msgLength];
    [request setRequestMethod: @"POST"];
    request.userInfo = data;

    [request appendPostData:[self getMsg]];
    [request setDelegate:self];

    [q addOperation:request];
    [q go];

}

NSDictionary *data = [NSDictionary dictionaryWithObjectsAndKeys:@"SiluetaImage", @"ACTION", silueta_id, @"siluetaid", siluetaTyp_id, @"siluetatypid", nil];
[self performSelector:@selector(downloadBinDataForTyp:data:) 
           withObject:@"SiluetaImage" 
           withObject:data];