改变webview字体的大小

通过导航栏上得+-按钮 改变文字的大小

1.首先创建导航栏按钮

UIBarButtonItem* itemone = [[UIBarButtonItemalloc]initWithImage:[UIImageimageNamed:@"字体加大-1"]style:UIBarButtonItemStyleDonetarget:selfaction:@selector(addLarge)];

UIBarButtonItem* itemtwo = [[UIBarButtonItemalloc]initWithImage:[UIImageimageNamed:@"字体减小-1"]style:UIBarButtonItemStyleDonetarget:selfaction:@selector(addmix)];

self.navigationItem.rightBarButtonItems=@[itemone,itemtwo];

self.navigationItem.rightBarButtonItem.tintColor= [UIColorwhiteColor];

2.创建局部变量（分别是控制大小的变量，和通过接口获取的内容）

@property(nonatomic,assign)int number;

@property(nonatomic,copy)NSString* coment;

3.初始化number =100

_number=100;

4.对coment赋值

_coment=[NSStringstringWithFormat:@"%@",result[@"result"][@"content"]];   这里是从接口获取标签的内容。展示在webview上。

5.点击增加 和减小的方法

- (void)addLarge {

if(_number<150)

{

_number+=10;

[self.webViewloadHTMLString:_comentbaseURL:nil];

}}

-(void)addmix

{

if(_number>60)

{

_number-=10;

[self.webViewloadHTMLString:_comentbaseURL:nil];

}}

6.最后一步啦(再加载结束后，对webview的字体改变)

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

NSString* stre = [NSString stringWithFormat:@"%d",_number];

stre = [stre stringByAppendingFormat:@"%@",@"%"];;

NSString* str = [NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%@'",stre];

[UIApplicationsharedApplication].networkActivityIndicatorVisible=NO;

[self.webViewstringByEvaluatingJavaScriptFromString:str];

}