Objective-c: Runtime Runtime

1. Is it possible to put more time-consuming operations in the notification Center?  

Notice in which line Cheng, then the processing of the notification event is carried out in the same thread;

if the asynchronous line Cheng the notification, then you can perform more time-consuming operations;if the Cheng of the main line is notified, then it is not possible to perform more time-consuming operations.  What is the difference between a 2.Foundation object and a Corefoundation object? when the foundation object is OC;the Corefoundation object is C;The Foundation object and the Corefoundation object can be converted to each other, and the conversion between data types· ARC: __bridge_retained, __bridge_transfer, Cfbridgingretain, cfbridgingrelease• Non-arc: __bridge  3. What is runtime?

1> Runtime is a set of underlying C language APIs (including many powerful and practical C-language data types, C-language functions)

2> Actually, we write the OC code, the bottom layer is based on the runtime implementation

* In other words, the OC code that we write at the end is turned into the underlying runtime code (c language Code)

What's the use of runtime?

1> can dynamically produce a class, a member variable, a method

2> can dynamically modify a class, a member variable, a method

3> can dynamically delete a class, a member variable, a method

Common functions, header files

#import <objc/runtime.h>: Member variables, classes, methods

Ivar * Class_copyivarlist: Get all member variables inside a class

Method * Class_copymethodlist: Get all the methods inside a class

Method Class_getinstancemethod: Get an instance approach (object method, minus-start)

Method Class_getclassmethod: Get a class approach (plus + start)

Method_exchangeimplementations: A specific implementation of 2 methods of exchange

#import <objc/message.h>: Messaging mechanisms

Objc_msgsend (...)

What is iOS swizzle? Implementation of 2 methods using run-time function exchange

Objective-c: Runtime Runtime