How can i add Day and Night Mode to AepubReader in ios - ios

Question

currently iam using AepubReader for reading epub files,But i want to implement day and night mode in that?Do you know how can i implement that modes?
Currently iam using following code but the problems are
1.Night mode is only effecting a particular chapter.
2.Day mode changes font the color to black.
NSUserDefaults *userDefaults2 = [NSUserDefaults standardUserDefaults];
[userDefaults2 setBool:NO forKey:#"cc"];
[userDefaults2 synchronize];
[webView setOpaque:NO];
[webView setBackgroundColor:[UIColor blackColor]];
// for(int i=0;i<10;i++)
// {
NSString *jsString = [[NSString alloc] initWithFormat:#"document.getElementsByTagName('html')[0].style.webkitTextFillColor= 'white'"];
[webView stringByEvaluatingJavaScriptFromString:jsString];
// }

Answer 1

This code works for me
-(IBAction)night:(id)sender{
NSUserDefaults *userDefaults2 = [NSUserDefaults standardUserDefaults];
[userDefaults2 setBool:NO forKey:#"btnM1"];
[userDefaults2 synchronize];
[_webview setOpaque:NO];
[_webview setBackgroundColor:[UIColor blackColor]];
NSString *jsString = [[NSString alloc] initWithFormat:#"document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'white'"];
[_webview stringByEvaluatingJavaScriptFromString:jsString];}
-(IBAction)day:(id)sender{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:YES forKey:#"btnM1"];
[userDefaults synchronize];
[_webview setOpaque:NO];
[_webview setBackgroundColor:[UIColor whiteColor]];
NSString *jsString2 = [[NSString alloc] initWithFormat:#"document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'black'"];
[_webview stringByEvaluatingJavaScriptFromString:jsString2];}
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSUserDefaults *menuUserDefaults = [NSUserDefaults standardUserDefaults];
if([menuUserDefaults boolForKey:#"btnM1"]){
[_webview setOpaque:NO];
[_webview setBackgroundColor:[UIColor whiteColor]];
NSString *jsString2 = [[NSString alloc] initWithFormat:#"document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'black'"];
[_webview stringByEvaluatingJavaScriptFromString:jsString2];
}
else{
[_webview setOpaque:NO];
[_webview setBackgroundColor:[UIColor blackColor]];
NSString *jsString = [[NSString alloc] initWithFormat:#"document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'white'"];
[_webview stringByEvaluatingJavaScriptFromString:jsString];
}}

Answer 2

You can use this code also for day & night mode. This code may be
work for as your need.
This will properly work for UIWebView.
The code is:
BOOL isNightMode;
- (IBAction)nightModeBtn_click:(id)sender {
isNightMode = YES;
[self.webView reload];
}
- (IBAction)dayModeBtn_click:(id)sender {
isNightMode = NO;
[self.webView reload];
}
- (void)webViewDidFinishLoad:(UIWebView *)_webView{
if(isNightMode == YES){
[self.webView setOpaque:NO];
NSString *setJavaScript = [[NSString alloc] initWithFormat:#" document.getElementsByTagName('body')[0].style.webkitFilter='grayscale(100%%)';document.getElementsByTagName('div')[0].style.webkitFilter='grayscale(100%%)'; DOMReady();"];
[self.webView stringByEvaluatingJavaScriptFromString:setJavaScript];
}
}