NSMutableURLRequest setHTTPBody方法使用SIGABRT警告使應用程序崩潰

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問題，我將不勝感激。 我將其范圍縮小到通過蘋果的調試器導致崩潰的最后一行。 非常感謝你！

Answer 1

有兩個錯誤：

1. 體不追加， [body stringByAppendingString:accountEntered]應為body=[body stringByAppendingString:accountEntered]

2. NSMutableData *data = [[NSMutableData data] initWithString:body]; 使用不正確，可以使用NSData *data=[body dataUsingEncoding:NSUTF8StringEncoding];

所以我修改了代碼：

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，您應該使“ accountEntered”和“ passwordEntered”不為零。 如果執行了此操作，則應設置斷點以確切地知道哪條線崩潰。通常，“ SIGABRT”錯誤表示您釋放了更多或無法識別的選擇器。 答案1上的代碼正確。