按下按钮即可更改UIWebView中的文本。 （简单？）

Question

How can I change the text in a WebView, with the press of a button?

I have a Web View, populated with HTML.

if ([buttonState isEqualToString:@"YES"]) {
    UIFont *webFont = [UIFont fontWithName:@"Helvetica" size:12];
    NSString *mainTextString;
    mainTextString = @"<p><b>General:</b>THIS IS TEXT1</p>";
    mainTextString = [NSString stringWithFormat:@"<span style=\"font-family: %@; font-size: %i\">%@</span>", webFont.fontName, (int) webFont.pointSize, mainTextString];
    [mainText loadHTMLString:mainTextString baseURL:nil];
}
else if ([buttonState isEqualToString:@"NO"]) {
    UIFont *webFont = [UIFont fontWithName:@"Helvetica" size:12];
    NSString *mainTextString;
    mainTextString = @"<p><b>General:</b>THIS IS TEXT2</p>";
    mainTextString = [NSString stringWithFormat:@"<span style=\"font-family: %@; font-size: %i\">%@</span>", webFont.fontName, (int) webFont.pointSize, mainTextString];
    [mainText loadHTMLString:mainTextString baseURL:nil];
}

I also have a UIButton, with which I want to change the text in the Webview.

- (IBAction)textChangeButton:(id)sender {
    if ([buttonState isEqualToString: @"NO"]) {
        buttonState = @"YES";
    }
    else if ([buttonState isEqualToString:@"YES"]) {
        buttonState = @"NO";
    }
    [mainText reload];
}

Unfortunately, when I press the button the second text does not appear!

Being fairly new to programming, I have no idea what the problem is. I have tried reloading the webview in the button press - still no luck. Could someone point me in the right direction?

Any help is much appreciated!

Answer 1

Calling [mainText reload] will just load an empty page. You need to execute the first code again for the webview to load the correct content.

Try to move the code to a new method and call it in viewDidLoad and textChangeButton:

- (void)reloadWebPage {
    if ([buttonState isEqualToString:@"YES"]) {
        mainTextString = (...);
        [mainText loadHTMLString:mainTextString baseURL:nil];
    }
    else if ([buttonState isEqualToString:@"NO"]) {
        mainTextString = (...);
        [mainText loadHTMLString:mainTextString baseURL:nil];
    }
}

- (void)viewDidLoad {
    [self reloadWebPage];
}

- (IBAction)textChangeButton:(id)sender {
    if ([buttonState isEqualToString: @"NO"]) {
        buttonState = @"YES";
    }
    else if ([buttonState isEqualToString:@"YES"]) {
        buttonState = @"NO";
    }

    [self reloadWebPage];
}