我正在尝试在使用 Objective-C 制作的应用程序中调整一些方法。我收到此错误:
Symbol not found: _OBJC_CLASS_$_IASAvatarViewController
在 Hopper 中打开可执行文件后,我看到所有类都以前缀objc_class_
代替。所以我试图调配的方法的类名是objc_class_IASAvatarViewController
. 首先,我很想知道类标识符是如何变成这样的(某种名称修饰?)。其次,我想知道是否可以让我的 dylib 引用正确的标识符。
DylibTest.h:
#import <UIKit/UIKit.h>
#import <objc/runtime.h>
@interface IASBaseViewController : UIViewController
@end
@interface IASAvatarViewController : IASBaseViewController
@end
@interface IASAvatarViewController (Swizzle)
@end
DylibTest.m
#import "DylibTest.h"
#import <dlfcn.h>
@implementation IASAvatarViewController (Swizzle)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
SEL originalSelector = @selector(viewDidLoad);
SEL swizzledSelector = @selector(xxx_viewDidLoad);
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
BOOL didAddMethod =
class_addMethod(class,
originalSelector,
method_getImplementation(swizzledMethod),
method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(class,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
});
}
- (void)xxx_viewDidLoad {
[[[UIAlertView alloc] initWithTitle:@"Swizzled method" message:@"Ya swizzle" delegate:nil cancelButtonTitle:@"Yeah. Okay" otherButtonTitles:nil] show];
[self xxx_viewDidLoad];
}
@end
以及带有 Objective-C 类的 Hopper 的屏幕截图:
编辑:获得足够的声誉可以直接发布图片。
Edit2: class-dump
文件: http: //pastebin.com/DcUD5AL5