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__weak typeof(self) weakSelf = self;
__weak __typeof(self) weakSelf = self;
__weak typeof(&*self) weakSelf = self;

参考:
http://www.tuicool.com/articles/bYBB7r

使用上一个命令的参数

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mkdir a b c 
rmdir !:1 !:2 !:$

!:n代表上一个命令的第n个参数
!$ 代表上一个命令的最后一个参数
Alt+.也可以试试

设置全局UINavigationBar和UITabBar风格

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[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:10/255.0f green:10/255.0f blue:10/255.0f alpha:0]];
[[UITabBar appearance] setBarTintColor:[UIColor colorWithRed:10/255.0 green:10/255.0 blue:10/255.0 alpha:0]];
[[UITabBar appearance] setBarStyle:UIBarStyleDefault];

Objective-C编码规范，内容来自苹果、谷歌的文档翻译，自己的编码经验和对其它资料的总结。

转自https://github.com/QianKaiLu/Objective-C-Coding-Guidelines-In-Chinese

##概要

Objective-C是一门面向对象的动态编程语言，主要用于编写iOS和Mac应用程序。关于Objective-C的编码规范，苹果和谷歌都已经有很好的总结：

• Apple Coding Guidelines for Cocoa
• Google Objective-C Style Guide

本文主要整合了对上述文档的翻译、作者自己的编程经验和其他的相关资料，为公司总结出一份通用的编码规范。

取消已经跟踪的文件（目录）

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// 文件
git rm --cached filename
// 目录
git rm -r --cached dir

isKindOfClass

return YES if the receiver is an instance of the specified class or an instance of any class that inherits from the specified class.

isMemberOfClass

return YES if the receiver is an instance of the specified class.

参考:

• http://stackoverflow.com/a/3653947/3355097
• https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Protocols/NSObject_Protocol/index.html

参考：
Objective-C ARC: strong vs retain and weak vs assign

@property (nonatomic, weak) id delegate;

@property (nonatomic, assign) id delegate;

当delegate所指向的对象(0xxxxxxx)已经销毁的时候
weak： delegate == nil
assign：还会指向那个地址(0xxxxxxx)

参考：
Whats the difference between ‘weak’ and ‘assign’ in delegate property declaration

Hello Amy

今儿去买手机，路上注意安全。

Got the solution finally. select info of the project then select Configuration select the dropdown Debug. From that list select your test target and change the None in Configurations Set Tab into Pods. Do the same in Release Tab also

参考：
AFNetworking Cause Error while using XCTest in Xcode5
CocoaPods’s wiki: multiple-targets may give you some advices