问题描述
每
http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html
NSDateFormatter 的 init 方法是在 iPhone OS 2.0 到 iPhone OS 3.2 中可用"，因此在 4.0 中不.现在，它确实有效，但这似乎很奇怪.这是一个错误还是有其他方法可以创建 NSDateFormatter?
The init method of NSDateFormatter is "Available in iPhone OS 2.0 through iPhone OS 3.2", and therefore not in 4.0. Now, it certainly works, but this seems odd. Is this is a mistake or is there some other way to create a NSDateFormatter?
推荐答案
这个弃用只是苹果清理 NSDateFormatter 的标头.init 已经在 NSNumberFormatter 继承的 NSObject 中声明.重新声明不是必需的，但是在实现中，苹果将覆盖 init，因为子类应该为超类的默认初始化程序提供实现.
This deprecation is just apple cleaning up the headers for NSDateFormatter. init is already declared in NSObject which NSNumberFormatter inherits from. Redeclaring is not necessary, however in the implementation apple will override init as subclassess should provide implementations for the default initializer of the superclass.
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