中文介绍 | 原理介绍

DynamicOC

A hotfix library based on flex/yacc. You can call any Objective-C class and method using DynamicOC. DynamicOC is functionally similar to JSPath, but it only needs to write native OC syntax to implement hotfix.

Features

• dynamically execute Objective-C code
• dynamically execute C function and block
• dynamically add property
• dynamically replace method
• dynamically add method
• Completed and detailed unit test
• powerful OC syntax parser based on flex/yacc
• support CGRect/CGSize/CGPoint/NSRange/UIEdgeInsets/CGAffineTransform C-struct ...

Basic Usage

dynamically execute block

NSString* text = @" \
__block int result = 0;\
UIView* view = [[UIView alloc]init];\
void(^blk)(int value) = ^(int value){\
    view.tag = value;\
};\
blk(1024);\
return view.tag;";

ASTNode* root = [ASTUtil parseString:text];
ASTVariable* result = [root execute];
NSAssert([result.value doubleValue] == 1024, nil);

dynamically execute C function

int echo(int value) {
    return value;
}

NSString* text = @" \
[OCCfuntionHelper defineCFunction:@\"echo\" types:@\"int, int\"]; \
return echo(1024);";

ASTNode* root = [ASTUtil parseString:text];
ASTVariable* result = [root execute];
NSAssert([result.value doubleValue] == 1024, nil);

dynamically add property

NSString* text = @" \
[OCCfuntionHelper defineCFunction:@\"objc_setAssociatedObject\" types:@\"void,id,void *,id,unsigned int\"];\
[OCCfuntionHelper defineCFunction:@\"objc_getAssociatedObject\" types:@\"id,id,void *\"];\
NSString* key = @\"key\"; \
objc_setAssociatedObject(self, key, @(1024), 1);\
return objc_getAssociatedObject(self, key);";

ASTNode* root = [ASTUtil parseString:text];
ASTVariable* result = [root execute];
NSAssert([result.value doubleValue] == 1024, nil);

Supported Syntax

• if/else while do/while for
• return break continue
• i++ i-- ++i --i
• +i -i !i
• + - * / % Arithmetic operation
• >> << & | ^ Bit operation
• && || >= <= != > < Compare operation
• ?:
• __block
• array[i] dict[@""]
• @666 @() @[] @{}
• self super
• self.property
• self->_property
• most of objective-c keyword

TODO

• @available()
• [NSString stringWithFormat:"%d",value] : use [NSString stringWithFormat:"%@",@(value)] instead。
• dispatch_async / dispatch_after ...
• *stop =YES, in block
• fix bugs

Communication

• GitHub : letqingbin
• Email : letqingbin@163.com

Warnning

Purely technology sharing, DO NOT Sheld to appstore! 

License

Copyright (c) 2019 letqingbin
Licensed under MIT or later

DynamicOC required features are based on or derives from projects below:

• MIT
• JSPatch
• Aspects
• OCEval