记录项目中所有UIViewControllers的类名 [英] Logging the class name of all UIViewControllers in a project

问题描述

我们收到了来自外包的巨大项目，我们正在努力修复。项目中有数百个视图控制器。我们的目标是轻松确定我们当前在设备上查看哪个类。

We have received a HUGE project from outsourcing that we are trying to "repair". There are hundreds of view controllers within the project. Our goal is to easily determine which class we are currently looking at on the device.

我们的解决方案（无效，因此SO问题）如下。

Our solution (which didn't work, hence the SO question) follows.

通过以下类别覆盖UIViewController的viewDidAppear方法：

Override the viewDidAppear method of UIViewController via a category with this:

-(void)viewDidAppear:(BOOL)animated
{
    NSLog(@"Current View Class: %@", NSStringFromClass(self.class));
    [self viewDidAppear:animated];
    //Also tried this:
    //[super viewDidAppear:animated];
}

此类别将放在 .pch 中该项目。

This category would be put in the .pch of the project.

这样就不需要在数百个视图控制器中放置额外的代码，并且可以轻松打开和关闭。它没有用，因为正如我们现在所了解的那样，< meme >不会简单地通过类别< /覆盖现有方法meme >。

This would require no extra code to be put in the hundreds of View Controllers and be easily turned on and off. It didn't work because, as we've learned now, <meme>one does not simply override an existing method via category</meme>.

我们缺少什么？！

推荐答案

答案是调整方法！以下是我们提出的结果：

The answer is to swizzle the methods! Here is what we came up with:

#import "UIViewController+Logging.h"
#import <objc/runtime.h>

@implementation UIViewController (Logging)

-(void)swizzled_viewDidAppear:(BOOL)animated
{
    NSLog(@"Current View Class: %@", NSStringFromClass(self.class));
    [self swizzled_viewDidAppear:animated];
}

+ (void)load
{
    Method original, swizzled;

    original = class_getInstanceMethod(self, @selector(viewDidAppear:));
    swizzled = class_getInstanceMethod(self, @selector(swizzled_viewDidAppear:));

    method_exchangeImplementations(original, swizzled);

}
@end

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