将保留的属性设置为新创建的对象的最佳方法 [英] Best way to set a retained property to a newly created object

问题描述

这是最好的方式来处理创建一个对象在一个保留的属性生活？我包括了几个例子。

Which is the best way to handle creating an object to live in a retained property? I've included several examples.

假设属性是：

@property (nonatomic, retain) myProperty;
@synthesize myProperty = _myProperty;

选项1：

self.myProperty = [[[MyClass alloc] init] autorelease];

选项2：

self.myProperty = [[MyClass alloc] init];
[self.myProperty release];

选项3：

_myProperty = [[MyClass alloc] init];

选项4：

MyClass *property = [[MyClass alloc] init];
self.myProperty = property;
[property release];

推荐答案

选项1： ...但是你正在使用autorelease来浪费资源。引用被添加到需要在运行循环结束时释放的项目列表...你的变量保持到那时，即使它不需要..等，我相信这个选项被使用经常...但我也相信它是懒惰和浪费。

Option 1: Acceptable... but you're wasting resources with autorelease. The reference gets added to a list of items that need to get released at the end of the run loop... your variable stays around until then even if it doesn't need to.. etc, etc. I believe this option is used frequently... but I also believe it's lazy and wasteful.

选项2：困惑。没有什么错，它本身，但我会说这是坏的形式。

Option 2: Confusing. Nothing wrong with it, per-se, but I'd say it's bad form.

选项3：可接受，但不理想。如果有自定义安装程序怎么办？等我本人只在自定义setter本身，或者，可能在一个类初始化器中使用这个表单。否则，您错过了属性的一些好处。

Option 3: Acceptable, but not ideal. What if there is a custom setter? Etc. I'd personally only use this form within a custom setter itself, or, possibly in a class initializer. Otherwise, you're missing out on some of the benefits of properties.

选项4：最好。

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