Stop web view bounce shows error - objective-c

Question

Trying to stop the webview from bouncing, when user drags the app/screen down there is a blank space appears on top. This is the code which is not working:
#import "Webview.h"
#interface Webview ()
#end
#implementation Webview
#synthesize webView;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
NSString *urlAddress= [[NSBundle mainBundle] pathForResource:#"demos/index" ofType:#"html"];
NSURL *url = [NSURL fileURLWithPath: urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];
webView.scrollView.delegate = self;
webView.scrollView.bounces = NO;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
//The webview is is scrolling
int yPosition = [[webView stringByEvaluatingJavaScriptFromString: #"scrollY"] intValue];
if([[webView stringByEvaluatingJavaScriptFromString: #"document.body.offsetHeight"] intValue] - yPosition == webView.frame.size.height)
{
//The user scrolled to the bottom of the webview
webView.scrollView.bounces = YES;
}else if([[webView stringByEvaluatingJavaScriptFromString: #"document.body.offsetHeight"] intValue] - yPosition > webView.frame.size.height + 100){
webView.scrollView.bounces = NO;
}
}
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{
NSLog(#"Finish");
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
Having message: Assigning to 'id _Nullable' from omcompatible type 'Webview *const __strong'

Answer 1

If that error is on the line:
_webView.scrollView.delegate = self;
...then the error is that your webView instance is not the correct type.
Check that your webView instance is a subclass of UIWebView.
You should be adopting the UIScrollViewDelegate protocol, by including a protocol declaration for the interface: #interface ViewController : UIViewController <UIScrollViewDelegate>