在Objective-C中使用高级方法swizzling，iOS 9？

问题很简单。我需要和平常一样的方法-如何在iOS9中用我的一个但是

@选择器（presentViewController:animated:completion:）替换原来的方法？它只能在iOS9模拟器中工作，不能在真实设备中工作

是，调用此代码，但随后您将获得
EXC\u BAD\u访问权限

为了测试它，我从“Master Detail template”创建了一个测试应用程序，添加了一个按钮并添加了以下代码：

UIViewController *vc = [[UIViewController alloc] init];
[self.navigationController presentViewController:vc animated:YES completion:nil];

已更新

@implementation UINavigationController (Extension)

- (void)swizzledPresentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion
{
    [ self swizzledPresentViewController:viewControllerToPresent animated:flag completion:completion ];
}

#pragma mark -

+ (void)swizzle:(Class)class oldSelector:(SEL)old newSelector:(SEL)new
{
    Method oldMethod = class_getInstanceMethod(class, old);
    Method newMethod = class_getInstanceMethod(class, new);


    if(class_addMethod(class, old, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
    {
        class_replaceMethod(class, new, method_getImplementation(oldMethod), method_getTypeEncoding(oldMethod));
    }
    else
    {
        method_exchangeImplementations(oldMethod, newMethod);
    }
}

+ (void)load
{
    [self swizzle:UINavigationController.class oldSelector:@selector(presentViewController:animated:completion:) newSelector:@selector(swizzledPresentViewController:animated:completion:)];
}

@end

在NSHipster网站上也写了几乎相同的代码

已更新

@implementation UINavigationController (Extension)

- (void)swizzledPresentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion
{
    [ self swizzledPresentViewController:viewControllerToPresent animated:flag completion:completion ];
}

#pragma mark -

+ (void)swizzle:(Class)class oldSelector:(SEL)old newSelector:(SEL)new
{
    Method oldMethod = class_getInstanceMethod(class, old);
    Method newMethod = class_getInstanceMethod(class, new);


    if(class_addMethod(class, old, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
    {
        class_replaceMethod(class, new, method_getImplementation(oldMethod), method_getTypeEncoding(oldMethod));
    }
    else
    {
        method_exchangeImplementations(oldMethod, newMethod);
    }
}

+ (void)load
{
    [self swizzle:UINavigationController.class oldSelector:@selector(presentViewController:animated:completion:) newSelector:@selector(swizzledPresentViewController:animated:completion:)];
}

@end

警告这个错误会在非常随机的设备上重现（在我的例子中是iphone5+ios9.0，但其他用户有更新的设备和ios9.1）。
问题是滑动中断检查
nil
值。本案例的解决方案：

1） 检查块是否为
nil
，然后将其替换为空的非nil块

2） 使用现成的库。我试过：
告诉我们你是如何使用swizzling.Edited方法的。我希望这将有助于找到一个解决方案你的swizzled方法不是无限递归的吗？？？？这部分只是指我调用原始方法。@Avi:Google关于“方法swizzling”。该方法的方法体与“swizzled”方法切换，因此代码实际上调用了原始方法。