返回到某个VC 的方法

#import "UIViewController+BackVCStr.h"

@implementation UIViewController (BackVCStr)

- (UIViewController *)backToVCStr:(NSString *)vcStr {

    NSArray * vcs = self.navigationController.viewControllers;

    Class vcClass = NSClassFromString(vcStr);

    for (UIViewController * vc in vcs) {

        if ([vc isKindOfClass:vcClass]) {

            return vc;

        }

    }

    return nil;

}

@end