NSMutableDictionary始終爲空

Question

我正在開發一個簡單的程序，它使用NSMutableDictionary爲參數創建SOAP消息。我不明白爲什麼從其他類調用的NSMutableDictionary變量總是返回空值，即使我已經添加了值。我直接嘗試了setObject：forKey，但它也不起作用。

這是我的代碼：

SOAPLib.h @屬性（非原子，保留）的NSMutableDictionary *參數;

Calculator.m SOAPLib * createSoap = [[SOAPLib alloc] init];

createSoap.Envelope = @"http://schemas.xmlsoap.org/soap/envelope/"; 
createSoap.MethodName = @"add"; 
createSoap.ServiceNameSpace = @"http://calculator.me.org/"; 

NSMutableDictionary *parameters = [[NSMutableDictionary alloc]init]; 
[parameters setObject:[NSNumber numberWithInt:2] forKey:@"i"]; 
[parameters setObject:[NSNumber numberWithInt:3] forKey:@"j"]; 

NSLog(@"Calc parameters: %@",parameters); <--- returns i = 2, j = 3 

[createSoap.parameters setDictionary:parameters]; <--- set 

NSLog(@"create soap param: %@", createSoap.parameters); <--- returns null 

Answer 1

只要致電：中

createSoap.parameters = parameters; 

代替

[createSoap.parameters setDictionary:parameters];