初始化时将参数传递给自定义类 [英] Passing parameters to a custom class on initialization

问题描述

我有一个消息，有两个属性， name 和 message 和另一个类具有两个文本字段 nameField 和 messageField / code>。
我想在 MessageController 中创建一个 Message 的实例，传递这两个属性作为参数。 p>



现在，我这样做：

  Message * messageIns = [Message alloc] init]; 
 messageIns.name = nameField; 
 messageIns.message = MessageField; 
  

如何在创建实例时传递值？
我试图在Message.m中重新定义 init ，但我不知道如何做。

   - （id）init {
 if（（self = [super init]））{
 
} 
 return self; 
} 
  

请帮助。

   - （id）initWithName：必须创建一个自定义初始化程序。 （NSString *）name_ message：（NSString *）message_ 
 {
 self = [super init]; 
 if（self）{
 self.name = name_; 
 self.message = message_; 
} 
 return self; 
} 
  

当然这假定你的参数是NSString类型，设置正确;）

I have a class Message with two attributes, name and message, and another class MessageController with two text fields, nameField and messageField. I want to make an instance of Message in MessageController, passing these two attributes as arguments.

Right now, I am doing this:

 Message *messageIns = [[Message alloc] init];
 messageIns.name = nameField;
 messageIns.message = MessageField; 

How can I pass the values at the creation of an instance? I tried to redefine init in Message.m, but I don't know how do that.

-(id)init{
    if((self=[super init])){

    }
    return self;
}

Please help.

解决方案

You have to create a custom initializer.

-(id)initWithName:(NSString *)name_ message:(NSString *)message_ 
{
     self = [super init];
     if (self) {
         self.name = name_;
         self.message = message_;
     }
     return self;
}

of course this assumes your parameters are of NSString type and that you have your properties set correctly ;)

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