1 、ios navigationcontroller 滑动返回
滑动返回是navigationcontroller默认返回按钮自带的功能，如果返回按钮自定义该功能失效，
解决的办法有两个：
①
self.navigationItem.backBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:button];//这个方法用不了
只能用
self.navigationItem.backBarButtonItem =
[ [UIBarButtonItem alloc]initWithTitle: style: target: action:]
选择范围较小，
②
UIButton*button = [UIButtonbuttonWithType:UIButtonTypeCustom];
[buttonsetFrame:CGRectMake(0,0,40,40)];
[buttonsetTitle:@"返回"forState:UIControlStateHighlighted];
[buttonsetTitle:@"返回"forState:UIControlStateNormal];
[buttonaddTarget:selfaction:@selector(back)forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem*bar = [[UIBarButtonItemalloc]initWithCustomView:button];
self.navigationItem.leftBarButtonItem= bar;
但是要在push之后加上
if([self.navigationControllerrespondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.delegate=nil;
}
2、webview加载html图片自适应屏幕宽度
在用webview加载html的时候如果碰到html中有图片的时候，如果不对html做一下处理的话，会发现，加载出来的图片有些是对
屏幕不会自己适配的，这个时候处理的时候有两种方法，
①对webview做下处理，
self.mWebView.scalesPageToFit=YES;
这个方法不完善，图片是会适配屏幕，但是字体会变小，
②写一个webview的拓展类
里面对html文本用js或者css做一下处理，添加一个一个head
[data_contentappendString:@"<html>"];
[data_contentappendString:@"<head>"];
[contentappendString:@"<meta charset=/"utf-8/">"];
[contentappendString:@"<meta id=/"viewport/" name=/"viewport/" content=/"width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=false/" />"];
[contentappendString:@"<meta name=/"apple-mobile-web-app-capable/" content=/"yes/" />"];
[contentappendString:@"<meta name=/"apple-mobile-web-app-status-bar-style/" content=/"black/" />"];
[contentappendString:@"<meta name=/"black/" name=/"apple-mobile-web-app-status-bar-style/" />"];
[contentappendString:@"<style>img{100%;}</style>"];
[contentappendString:@"<style>table{100%;}</style>"];
[contentappendString:@"<title>webview</title>"];
这个处理的比较完美，也可以加在html的尾部，但是没有放在头部灵活，