用捏合改变字体大小(Changing font size with a pinch)

 我使用以下代码来更改带有夹点的Web视图的字体大小： 
 
- (void)changeFontSize:(FontSizeChangeType)changeType
{
    if (changeType == FontSizeChangeTypeIncrease && _currentFontSize == 160) return;
    if (changeType == FontSizeChangeTypeDecrease && _currentFontSize == 70) return;
    if (changeType != FontSizeChangeTypeNone)
    {
        _currentFontSize = (changeType == FontSizeChangeTypeIncrease) ? _currentFontSize + 5 : _currentFontSize - 5;
        [[NSUserDefaults standardUserDefaults] setInteger:_currentFontSize forKey:@"fontsize"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    NSString *jsString = [[NSString alloc] initWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'",
                          _currentFontSize];
    [self.webView stringByEvaluatingJavaScriptFromString:jsString];
}
 
 字体大小会发生变化，这一切都很棒。 但是，如果您退出Web视图，然后稍后返回，则不会保存字体大小。 我必须捏，然后它恢复到所选的字体大小。 在ViewDidLoad我称之为，我认为应该工作： 
 
 if ([[NSUserDefaults standardUserDefaults] objectForKey:@"fontsize"] == nil)
    {
        _currentFontSize = 100;
    }
    else
    {
        _currentFontSize = [[NSUserDefaults standardUserDefaults] integerForKey:@"fontsize"];
    }
 
 但事实并非如此。 有任何想法吗？ 

I use the following code to change the font size of a web view with a pinch:
 
- (void)changeFontSize:(FontSizeChangeType)changeType
{
    if (changeType == FontSizeChangeTypeIncrease && _currentFontSize == 160) return;
    if (changeType == FontSizeChangeTypeDecrease && _currentFontSize == 70) return;
    if (changeType != FontSizeChangeTypeNone)
    {
        _currentFontSize = (changeType == FontSizeChangeTypeIncrease) ? _currentFontSize + 5 : _currentFontSize - 5;
        [[NSUserDefaults standardUserDefaults] setInteger:_currentFontSize forKey:@"fontsize"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    NSString *jsString = [[NSString alloc] initWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'",
                          _currentFontSize];
    [self.webView stringByEvaluatingJavaScriptFromString:jsString];
}
 
The font size changes, and that is all great. However, if you leave the web view, and then come back later, the font size is not saved. I have to pinch, and then it reverts back to the chosen font size. At the ViewDidLoad I call this, which I thought should work:
 
 if ([[NSUserDefaults standardUserDefaults] objectForKey:@"fontsize"] == nil)
    {
        _currentFontSize = 100;
    }
    else
    {
        _currentFontSize = [[NSUserDefaults standardUserDefaults] integerForKey:@"fontsize"];
    }
 
It doesn't though. Any ideas?

原文：https://stackoverflow.com/questions/21501714