objective-c - 为什么我的数组保持为空？

Question

嗨，我是 objC 菜鸟。我在用对象填充 NSMutableArray 时遇到问题。

for(id p in tmpArray){
    Person *person = [[Person alloc] init];
    person.usrName = p;
    [persons addObject:person]; // after this line the persons
                                // array is still empty
    [person release];
}

Persons 是一个 NSMutableArray 属性，问题是它是空的。是否太早释放了 person 对象，或者我实例化错误了？

Answer 1

您需要在 -init 方法中初始化数组，如下所示:

NSMutableArray *array = [[NSMutableArray alloc] init];
self.persons = array; // will be automatically retained 
                      // because you're using the property
[array release]; // we alloced - we release it

不要忘记释放它:

-(void)dealloc {
     self.persons = nil; // previous value of property 'persons' will be released
     [super dealloc];
}