down voteaccepted Swift 2.2 / Xcode 7.3 has a new way to use selector:Selector("funcName")was changed to#selector(ClassName.funcName) Have a look athttps://github.com/apple/swift-evolution/blob/master/proposals/0022-objc-selectors.md, tl;dr; Rep…

转载请附上本文地址: http://www.cnblogs.com/nextbin/p/6219677.html 本文参考: JAVA源码 http://swiftlet.net/archives/998 http://blog.csdn.net/kingzone_2008/article/details/8535287 Exception和Error皆继承自Throwable.下面看看这3个类的源码注释,也就明白许多. 异常(Exception)分为checked异常和unchecked异常.…

For a primary expression x that is not a package name, the selector expression x.f denotes the field or method f of the value x (or sometimes *x; see below). The identifier f is called the (field or method) selector; it must not be the blank identifi…

reference from:https://www.voxxed.com/blog/2015/02/too-fast-too-megamorphic-what-influences-method-call-performance-in-java/ Whats this all about then? Let’s start with a short story. I proposed a change on the a Java core libs mailing list to overri…

  15.12.1. Compile-Time Step 1: Determine Class or Interface to Search   The first step in processing a method invocation at compile time is to figure out the name of the method to be invoked and which class or interface to check for definitions of m…

https://blog.csdn.net/shiqw5696/article/details/80664749 前段时间写了一篇关于C++异常捕获及异常处理的文章:c++异常捕获及异常处理try-throw-catch 严格的来说,那不算是一篇完整的文章,更多的是提出我的疑惑.顺便总结了一下网友关于C++异常捕获及异常处理给出的精炼的示例. 至今,上文提到的疑惑本菜鸟都没有完全解开. 于是,我就选择了用 __try __except 来捕获及处理异常.经过测试,我想捕获的异常用 __try _…

Objective-C对象收到消息之后,究竟会调用何种方法需要在运行期间才能解析出来.那你也许会问:与给定的选择子名称相应的方法是不是也可以在runtime改变呢?没错,就是这样.若能善用此特性,则可发挥出巨大优势,因为我们既不需要源代码,也不需要通过继承子类来覆写方法就能改变这个类本身的功能.这样一来,新功能将在本类的所有实例中生效,而不仅限于覆写了相关方法的那些子类实例.此方案就是大名鼎鼎的「method swizzling」,中文常称之为『方法调配』或『方法调和』或『方法混合』. Meth…

Swift Method Dispatching When announcing Swift, Apple described it as being much faster than Objective-C. On the web, there is a number of comparsions juxtaposing speed of both languages. In my opinion, the way Swift dispatches method invocations has…

在项目中定义了以new开头的textField.结果报错: 先看我的源代码: #import <UIKit/UIKit.h> @interface ResetPasswordViewController : UIViewController @property (weak, nonatomic) IBOutlet UITextField *phoneTextField; @property (weak, nonatomic) IBOutlet UITextField *oldPasswordT…

SQL return codes that are preceded by a minus sign (-) indicate that the SQL statement execution was unsuccessful. IBM DB2 SQL error code list 官方文档地址:https://www.ibm.com/support/knowledgecenter/SSEPEK_10.0.0/codes/src/tpc/db2z_n.html -007STATEMENT CO…