How Do I Declare A Block in Objective-C?】的更多相关文章

How Do I Declare A Block in Objective-C? As a local variable: returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...}; As a property: @property (nonatomic, copy) returnType (^blockName)(parameterTypes); As a method parameter: - (void)…
As a local variable: returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...}; As a property: @property (nonatomic, copy) returnType (^blockName)(parameterTypes); As a method parameter: - (void)someMethodThatTakesABlock:(returnType (^)…
前言 block在Objective C开发中应用非常广泛,我们知道block会捕获外部对象,也知道使用block要防止循环引用. "知其然而不知其所以然"是一件非常痛苦的事情,那么block这套机制在OC中是怎样实现的呢?本文通过从C/C++到汇编层面分析block的实现原理. Clang clang是XCode的编译器前端.编译器前端负责语法分析,语义分析,生成中间代码(intermediate representation ). 比方当你在XCode中进行build一个.m文件的…
0. 问题所在 下面给出一段代码: - (NSArray*) getBlockArray { int num = 916; return [[NSArray alloc] initWithObjects: ^{ NSLog(@"this is block 0:%i", num); }, ^{ NSLog(@"this is block 1:%i", num); }, ^{ NSLog(@"this is block 2:%i", num); },…
如何优雅的使用 Block? How Do I Declare A Block in Objective-C? 阮一峰的一句话解释简洁明了:闭包就是能够读取其它函数内部变量的函数 详情:http://blog.csdn.net/jasonblog/article/details/7756763 block的几种适用场合: 任务完成时回调处理 消息监听回调处理 错误回调处理 枚举回调 视图动画.变换 排序 作为基本变量 As a local variable 1 returnType (^bloc…
1.简介 OC的Block感觉就是C中饿函数指针,提供回调功能,但是OC中的block比C的函数指针要更加强大,甚至可以访问本地变量和修改本地变量. block在oc中是一个对象,它可以像一般的对象那样给变量赋值,存储进集合对象,还可以作为方法参数传递. 使用block我们甚至可以在很多情况下取代代理使得代码量更少,逻辑更加清晰. 2.申明与定义 申明: 语法:ReturnType (^blockName)(Parameters) 例子: int (^firstBlock)(NSString *…
Getting Started with Blocks(开始block) The following sections help you to get started with blocks using practical examples. 接下来这一节有实用的例子帮你开始blocks. Declaring and Using a Block (定义和使用block) You use the ^ operator to declare a block variable and to indic…
我们可以把Block当做Objective-C的匿名函数.Block允许开发者在两个对象之间将任意的语句当做数据进行传递,往往这要比引用定义在别处的函数直观.另外,block的实现具有封闭性(closure),而又能 "" 阅读器 block 本文转自破船的博客: 小引 本周末微博上朋友发了一个关于block的MV,只能说老外太逗了.大家也可以去看看怎么回事:Cocoa Got Blocks.虽然之前也有接触过block,不过没有深入完整的学习过,借此机会来学习一下,顺便翻译几篇blo…
Automake是用来根据Makefile.am生成Makefile.in的工具 标准Makefile目标 'make all' Build programs, libraries, documentation, etc. (same as 'make'). 'make install' Install what needs to be installed, copying the files from the package's tree to system-wide directories.…
档 ID 420787.1 White Paper Oracle Applications Multiple Organizations Access Control for Custom Code Checked for relevance on 12-JAN-2011 See Change Record This document discusses how to update the customization code that is affected by the access con…