Swift Swift - 1 year ago 143
Objective-C Question

iOS UIWebView flicker issue

I have a UIWebView and a swipe gesture in the same screen. When I'm swiping, I am reloading the webview, because if I don't, the call to js is not being made.

The reload works only once, I am unable to swipe again.

When I removed

[self.webview reload]
swiping is done fine, but the UIWebView keeps flickering. It just jumps up everytime!
I need to make a call to js everytime I swipe.

I tried these:

Method 1:

when loading webview:
self.webview.alpha = 0;

- (void)webViewDidFinishLoad:(UIWebView *)webView {

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.30];
self.webview.alpha = 1;
[UIView commitAnimations];

Method 2:

- (void)webViewDidFinishLoad:(UIWebView *)webView {

[self.webview setOpaque:NO];
self.webview.backgroundColor = [UIColor clearColor];

Method 3:

- (void)viewDidLoad {
[super viewDidLoad];

[self.webview loadHTMLString:@"<html><body style=\"background-color:black;\"></body></html>" baseURL:nil];

[self performSelector:@selector(loadWebview) withObject:nil afterDelay:0.1];
-(void)loadWebview {

self.webview.delegate = self;
self.webview.scrollView.delegate = self;
self.webview.scrollView.bounces = NO;
self.webview.scrollView.scrollsToTop = NO;
[self.view addSubview:self.webview];
pathToHtml = [[NSBundle mainBundle] pathForResource:@"mypath" ofType:@"html"];
NSString* appHtml = [NSString stringWithContentsOfFile:pathToHtml encoding:NSUTF8StringEncoding error:nil];
NSURL *baseURL = [NSURL fileURLWithPath:pathToHtml];

[self.webview loadHTMLString:appHtml baseURL:baseURL];

Need help!

Answer Source

I found out that I had this in my webViewDidFinishLoad :

  //Make the page fit to view. THIS IS BAD
    CGRect webviewBound = self. webview.bounds;
    webviewBound.size.height = self. webview.scrollView.contentSize.height;
    self. webview.bounds = webviewBound;

So I removed that and added:

  [self.webview.scrollView setContentSize: CGSizeMake(self.webview.frame.size.width, self.webview.scrollView.contentSize.height)];
    self.webview.scrollView.delegate = self;

And I added this in viewDidLoad because I had grey background:

//Removes the shadow from the webview i.e., "grey background"
if ([[self.webview subviews] count] > 0)
    for (UIView* shadowView in [[[self.webview subviews] objectAtIndex:0] subviews])
        [shadowView setHidden:YES];

    // unhide the last view so it is visible again because it has the content
    [[[[[self.webview subviews] objectAtIndex:0] subviews] lastObject] setHidden:NO];
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