LRSignatureController *vc = [LRSignatureController new];
vc.delegate = self;

//如果使用了自定义导航栏  请替换
 UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
    
 [self presentViewController:nav animated:YES completion:nil];
    
    
#pragma mark - LRSignatureControllerDelegate
-(void)signatureController:(LRSignatureController *)signatureController saveImage:(UIImage *)image
{
    NSLog(@"Delegate saveImage");
    
    [_signBtn setImage:image forState:0];
}

-(void)cancelButtonClicked
{
    NSLog(@"cancelButtonClicked");
}

LRSignatureController *vc = [LRSignatureController new];
vc.delegate = self;
vc.SaveBtnClickedHandle = ^(UIImage *signImage){
    
        NSLog(@"SaveBtnClickedHandle");
        
        [_signBtn setImage:signImage forState:0];
        
    };
    
vc.CancelBtnClickedHandle = ^(){
        
        NSLog(@"CancelBtnClickedHandle");
        
    };

//如果使用了自定义导航栏  请替换
 UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
    
 [self presentViewController:nav animated:YES completion:nil];