IOS Hook 类成员变量

最新推荐文章于 2024-10-18 12:35:07 发布

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最新推荐文章于 2024-10-18 12:35:07 发布

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原文链接：http://www.cnblogs.com/dependence/p/4468150.html

本文介绍了如何使用MSHookIVar在iOS应用中钩子实例变量，包括其基本用法、参数说明及注意事项，并提供了实例代码帮助开发者更好地理解和应用这一技术。同时强调了在编译tweak时需要导入substrate.h头文件，并在tweak名称中声明被钩子的应用或框架。通过实际案例展示如何修改和利用钩子的实例变量来满足特定需求。

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It seems that in your case you are trying to use an instance variable of the class you are hooking. Modifying the instance variable does not work that way in tweaks. You have to use MSHookIvar to 'hook' an instance variable (aka ivar). Example:

[Tweak.xm/mm]

#import <substrate.h> // necessary
#import <Foundation/Foundation.h>

@interface TheClassYouAreHooking : NSObject {
    NSString *_exampleVariable;
}
- (void)doSomething;
@end

NSString *_exampleVariableHooked;

%hook TheClassYouAreHooking
- (void)doSomething 
{
    // 'Hook' the variable

    exampleVariableHooked = MSHookIvar<NSString *>(self, "_exampleVariable");

    // The name of the hooked variable does not need to be the same

    exampleVariableHooked = @"Hello World";

    // You can do ANYTHING with the object Eg. [exampleVariableHooked release];

}
%end

MSHookIvar can also hook stuff like BOOLs and floats etc.

exampleVariableHooked = MSHookIvar<BOOL>(self, "_someBOOL");

Its declared in substrate.h so you need to import that otherwise you will not be able to compile your tweak. Also as a bonus tip, I'm just reminding you that you have to put the identifier of the app/framework you're hooking in your tweakname.plist.

So after you 'hook' the variable you can change it to suit your needs. Happy coding!

转载于:https://www.cnblogs.com/dependence/p/4468150.html