runtime在viewWillAppear获取当前控制器的类名

UIViewController+Utils.h

NS_ASSUME_NONNULL_BEGIN

@interface UIViewController (Utils)
/**
Whether or not to set ModelPresentationStyle automatically for instance, Default is [Class LL_automaticallySetModalPresentationStyle].

@return BOOL
*/
@property (nonatomic, assign) BOOL LL_automaticallySetModalPresentationStyle;

/**
 Whether or not to set ModelPresentationStyle automatically, Default is YES, but UIImagePickerController/UIAlertController is NO.

 @return BOOL
 */
+ (BOOL)LL_automaticallySetModalPresentationStyle;
@end

NS_ASSUME_NONNULL_END

UIViewController+Utils.m

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

static const char *LL_automaticallySetModalPresentationStyleKey;
@implementation UIViewController (Utils)
+ (void)load {
    Method originAddObserverMethod = class_getInstanceMethod(self, @selector(presentViewController:animated:completion:));
    Method swizzledAddObserverMethod = class_getInstanceMethod(self, @selector(LL_presentViewController:animated:completion:));
    method_exchangeImplementations(originAddObserverMethod, swizzledAddObserverMethod);
    method_exchangeImplementations(class_getInstanceMethod(self, @selector(viewWillAppear:)), class_getInstanceMethod(self, @selector(iv_viewWillAppear:)));
}
-(void)iv_viewWillAppear:(BOOL)animated
{
    [self iv_viewWillAppear:animated];
    NSLog(@"😊😊😊😊😊😊\n\n\n | %@ \n\n\n 😊😊😊",self.class);
}
- (void)setLL_automaticallySetModalPresentationStyle:(BOOL)LL_automaticallySetModalPresentationStyle {
    objc_setAssociatedObject(self, LL_automaticallySetModalPresentationStyleKey, @(LL_automaticallySetModalPresentationStyle), OBJC_ASSOCIATION_ASSIGN);
}

- (BOOL)LL_automaticallySetModalPresentationStyle {
    id obj = objc_getAssociatedObject(self, LL_automaticallySetModalPresentationStyleKey);
    if (obj) {
        return [obj boolValue];
    }
    return [self.class LL_automaticallySetModalPresentationStyle];
}

+ (BOOL)LL_automaticallySetModalPresentationStyle {
    if ([self isKindOfClass:[UIImagePickerController class]] || [self isKindOfClass:[UIAlertController class]]) {
        return NO;
    }
    return YES;
}

- (void)LL_presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
    if (@available(iOS 13.0, *)) {
        if (viewControllerToPresent.LL_automaticallySetModalPresentationStyle) {
            viewControllerToPresent.modalPresentationStyle = UIModalPresentationFullScreen;
        }
        [self LL_presentViewController:viewControllerToPresent animated:flag completion:completion];
    } else {
        // Fallback on earlier versions
        [self LL_presentViewController:viewControllerToPresent animated:flag completion:completion];
    }
}
@end