避免程序出现 unrecognized selector 闪退问题

给NSObject添加分类

加入代码

+(void)load{

    Method method1 = class_getInstanceMethod(self.class, @selector(methodSignatureForSelector:));

    Method method2 = class_getInstanceMethod(self.class, @selector(mymethodSignatureForSelector:));

    method_exchangeImplementations(method1, method2);

    

    Method method3 = class_getInstanceMethod(self.class, @selector(forwardInvocation:));

    Method method4 = class_getInstanceMethod(self.class, @selector(myforwardInvocation:));

    method_exchangeImplementations(method3, method4);

}

-(NSMethodSignature*)mymethodSignatureForSelector:(SEL)selector

{

    NSMethodSignature *signature = [NSMethodSignature signatureWithObjCTypes:@encode(void)];

    return signature;

}

- (void)myforwardInvocation:(NSInvocation *)invocation {

}

做法比较霸道

参考：https://www.jianshu.com/p/c89b2716d60d