iphone - 使用 ASIFormDataRequest 的 startAsynchronous 请求上的 EXC_BAD_ACCESS

Question

我要EXC_BAD_ACCESS上线了：

[asiUsernameRequest startAsynchronous];

在这段代码中。花了几个小时试图弄清楚，但没有解决方案。任何想法？

    NSString *usernameValue = (NSString*)usernameField.text;
    NSLog(@"username selected: %@", usernameValue);

    NSURL *url = [NSURL URLWithString:@"http://www.mywebsite.com/api/usernameCheck"];
    //ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    asiUsernameRequest = [[[ASIFormDataRequest alloc] initWithURL:url] retain];
    [asiUsernameRequest setPostValue:usernameValue forKey:@"username"];
    NSArray *objects = [NSArray arrayWithObjects:@"usernameCheck", nil];
    NSArray *keys = [NSArray arrayWithObjects:@"action", nil];
    asiUsernameRequest.userInfo = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
    [asiUsernameRequest setDelegate:self];
    [asiUsernameRequest startAsynchronous];

Answer 1

尝试保留usernameField's text：

NSString * usernameValue = [[usernameField.text] retain];