iOS13后modal页面不全屏问题

利用runtime快速解决，只需放入工程即可

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

@implementation UIViewController (VLDModal)

+ (void)load{
    
    SEL originalSel = @selector(presentViewController:animated:completion:);
    SEL overrideSel = @selector(override_presentViewController:animated:completion:);
    
    Method originalMet = class_getInstanceMethod(self.class, originalSel);
    Method overrideMet = class_getInstanceMethod(self.class, overrideSel);
    
    method_exchangeImplementations(originalMet, overrideMet);
}
 
#pragma mark - Swizzling
- (void)override_presentViewController:(UIViewController *)viewControllerToPresent animated: (BOOL)flag completion:(void (^ __nullable)(void))completion{
    if(@available(iOS 13.0, *)){
        if (viewControllerToPresent.modalPresentationStyle ==  UIModalPresentationPageSheet){
            viewControllerToPresent.modalPresentationStyle = UIModalPresentationFullScreen;
        }
    }
    
    [self override_presentViewController:viewControllerToPresent animated:flag completion:completion];
}


@end