初始化对象 [英] Initializing objects

问题描述

可能重复：

[NSMutableArray数组]与[[NSMutableArray alloc] init]之间的区别

使用Objective-C /可可粉，有什么区别：

Using Objective-C/Cocoa, what's the difference between:

NSMutableData *myData = [NSMutableData data];
NSMutableString *myString = [NSMutableString string];

和

NSMutableData *myData = [[NSMutableData alloc] init];
NSMutableString *myString = [[NSMutableString alloc] init];

据我所知，它们似乎具有相同的最终结果？

They seem to have the same end result as far as I can tell?

推荐答案

[NSMutableData数据]被称为帮助器，请查看此帖子，可可中的助手功能

[NSMutableData data] is referred to as a helper, check this post, Helper functions in Cocoa

助手通常会为您处理内存管理，也可以用于返回

Helpers generally take care of the memory management for your, can also be used to return singletons.

[[NSMutableData] alloc] init]，则您负责内存管理。

[[NSMutableData] alloc] init], you are responsible for memory management.

您正在使用ARC，而不必释放对象，它会为您完成。

Although if you are using ARC you don't have to release your objects, it does it for you.

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