Web我找不到官方參考，但似乎hashValue從NSObjectProtocol調用hash方法，而==調用isEqual:方法（來自同一協議）。 請參閱答案末尾的更新！ 對於NSObject子類，正確的 … Web24 okt. 2015 · The base implementation of the isEqual: provided by the NSObject class is equivalent to an identity check by pointer equality. You can override isEqual: in a subclass to have Swift and Objective-C APIs determine equality based on the contents of objects rather than their identities. The book is available in the Apple Book app.
hash Apple Developer Documentation
Web和isEqual配套的另一個方法hash也經常被提起，官方文檔甚至規定isEqual和hash必須被同時實現。 學習過hash表之後，我們知道如果兩個對象業務上相等，那麼他們的hash值一定是相等的，hash方法的用處還是在於判斷相等性，系統默認的hash方法實際上返回的就是對象 … Web1 aug. 2024 · You state in your question that you implement isEqual, the ObjC, analog to Swift's ==, but you're probably not providing a hash implementation that agrees with your isEqual implementation in all cases. Original Answer (Possibly incorrect for this case, but may still useful if queues are the problem) bitche blason
cocoa集合类型：nspointerarray，nsmaptable，nshashtable
Web文章目录前言一、MessageDigest 类是什么？二、方法介绍1、getInstance2、update3、digest4、reset5、isEqual三、使用步骤1.创建报文摘要实例2.传入需要计算的字符串3.计算消息摘要4.处理计算结果四、MD5工具类1.MessageDigest实现对字符串的MD5加密算 … Web8 nov. 2024 · -isEqual： 一般是用来判断人们定义的相等性。 继承 NSObject中的-isEqual：方法的默认实现是使用的 == 内存 例如，咱们定义只要两个对象中的全部属性相等，咱们就认为这两个对象是相等的。 这时候咱们就要重写-isEqual：方法，在里面判断两个对象中的全部属性是否相等，若是是就返回YES，不是就返回NO。 这样，对比的结果 … Web15 okt. 2013 · The hash and isEqual methods will both return true for two objects, but containsObject will return false. Sometimes this code works and sometimes it doesn't. models count: 1 isEqual: 1 hashes equal: 1 containsObject: 0 How is it possible the below code could print out the above? bitche bar a encre