Question

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"riderfinder.appspot.com/login"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"text/plain" 
   forHTTPHeaderField:@"Content-type"];

    NSString *body = @"username=";
    [body stringByAppendingString:accountEntered];
    [body stringByAppendingString:@"&"];
    [body stringByAppendingString:@"password="];
    [body stringByAppendingString:passwordEntered];

    NSMutableData *data = [[NSMutableData data] initWithString:body];

    //Crashes everything with "SIGABRT" warning/error. Nothing else is said.
    [request setHTTPBody:data];

如果有人知道出了什么问题，我将不胜感激。我把它缩小到最后一行，导致Apple的调试器崩溃。非常感谢你！

Answer 1

有2个错误：

正文，[body stringByAppendingString:accountEntered]应为body=[body stringByAppendingString:accountEntered]
NSMutableData *data = [[NSMutableData data] initWithString:body];未正确使用，您可以使用NSData *data=[body dataUsingEncoding:NSUTF8StringEncoding];

所以我修改了代码：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"riderfinder.appspot.com/login"]];
[request setHTTPMethod:@"POST"];
[request setValue:@"text/plain" forHTTPHeaderField:@"Content-type"];

NSString *body = @"username=";
body=[body stringByAppendingString:accountEntered];
body=[body stringByAppendingString:@"&"];
body=[body stringByAppendingString:@"password="];
body=[body stringByAppendingString: passwordEntered];

//NSMutableData *data = [[NSMutableData data] initWithString:body];
NSData *data=[body dataUsingEncoding:NSUTF8StringEncoding];

[request setHTTPBody:data];

Answer 2

首先，你应该让'accountEntered＆＃39;并且＆＃39; passwordEntered＆＃39;不是。如果你已经这样做了，你应该设置断点以确切地知道哪条线路崩溃。通常，＆＃34; SIGABRT＆＃34;错误意味着您释放更多或未识别的选择器。答案1的代码是对的。

NSMutableURLRequest setHTTPBody方法使用SIGABRT警告崩溃应用程序

2 个答案: