获取ARC警告以强烈捕获ojbect

Question

I'm using ARC and getting a warning saying Capturing 'request' strongly in this block is likely to a retain cycle.

__block ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:url];
[request setCompletionBlock:^{
        NSString *responseString = [request responseString];
        self.appointmentArray = [responseString JSONValue];
    }];
    [request setFailedBlock:^{
        NSError *error = [request error];
        NSLog(@"%@", error.description);
    }];

Answer 1

I'm assuming request is declared somewhere before the blocks. You need to declare it as __weak , or set a second, weakly-declared variable to it.

This question is similar. Try this:

__block ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:url];
__weak ASIHTTPRequest *request_b = request;
[request setCompletionBlock:^{
    NSString *responseString = [request_b responseString];
    self.appointmentArray = [responseString JSONValue];
}];
[request setFailedBlock:^{
    NSError *error = [request_b error];
    NSLog(@"%@", error.description);
}];

Answer 2

Simply replacing:
__block ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:url];

with:
__weak ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:url];

will suffice.