iphone - iOS:如何查询nsmutablearray对象中的对象

Question

谁能帮我告诉我如何访问 NSMutableArray 中的对象。

对象的创建是这样的:

View Controller :

Students *studens =[[Students alloc] initWithDictionary:data]; //where data is NSDictionary
[self.studentData addObject:studens]; //where studentData is a NSMutableArray

在 Students 中是一个 NSObject 类。在学生类中:

-(id)initWithDictionary:(NSDictionary *)studenDictionary
    self = [super init];
    if (self)
    {
        self.studentName= [stateDictionary objectForKey:@"name"];
        self.studenLastName= [stateDictionary objectForKey:@"lastName"];
        self.StundenAddress= [stateDictionary objectForKey:@"address"];
    }
    return self;
}

如果我 nslog nsmutablearray 我会得到这个输出:

"<studens: 0x756b970>",
"<studens: 0xf46f9a0>"

例如，我的问题是如何访问学生姓名 John 的信息？

Answer 1

在您的Students 类中实现description 方法:

- (NSString *)description {
    return [NSString stringWithFormat:@"Students: name: %@, lastName: %@, address: %@", self.studentName, self.studentLastNAme, self.studentAddress];
}

现在，当您记录数组时，您将看到有关数组中每个 Students 对象的有用信息。