很多时候，iOS原生应用快速的不能满足我们的需求，于是需要嵌入web页面来实现，这时我们需要定义一个UIWebView，再取得想要加载的url：

#import "WebViewController.h"

@interface WebViewController ()<UIWebViewDelegate,UIScrollViewDelegate>
 {
     UIActivityIndicatorView *activityIndicatorView;
 }
@property(nonatomic,strong) UIWebView  *webView;
@property (nonatomic, strong) id url;

@end

下面是实现方法：

@implementation WebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _url = @"https://www.baidu.com";   //获取URL
    // 初始化webview
    _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    // 不显示滚动条
    _webView.scrollView.showsHorizontalScrollIndicator = NO;
    _webView.scrollView.delegate = self;
    _webView.delegate = self;
    _webView.backgroundColor = [UIColor clearColor];
    [_webView setScalesPageToFit:YES];

    // 初始化无敌风火轮
    activityIndicatorView = [[UIActivityIndicatorView alloc]
                         initWithFrame : CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)] ;
    [activityIndicatorView setCenter: self.view.center] ;
    // 设置风火轮样式
    [activityIndicatorView setActivityIndicatorViewStyle: UIActivityIndicatorViewStyleGray] ;
    [self.view addSubview:_webView];
    [self.view addSubview : activityIndicatorView] ;

    // 判断URL样式，使用不同的加载方式
    if ([_url isKindOfClass:[NSString class]]) {
        [self loadWebPageWithString:_url];
    }else{
        NSURLRequest *request =[NSURLRequest requestWithURL:_url];
        [_webView loadRequest:request];
    }
}

- (void)loadWebPageWithString:(NSString*)urlString
{
    self.url = urlString;
    NSURL *url =[NSURL URLWithString:urlString];
    NSURLRequest *request =[NSURLRequest requestWithURL:url];
   [_webView loadRequest:request];
}

#pragma mark - UIWebViewDelegate
/* 返回NO表示不允许加载这个请求 */
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    return YES;
}
// 开始加载
- (void)webViewDidStartLoad:(UIWebView *)webView{
     //展示风火轮
     [activityIndicatorView startAnimating] ;
}
// 完成加载
- (void)webViewDidFinishLoad:(UIWebView *)webView{
    //停止风火轮
    [activityIndicatorView stopAnimating];
}
// 加载失败
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
    [activityIndicatorView stopAnimating];
    if([error code] == NSURLErrorCancelled){
        return;
    }
}

#pragma mark - UIScrollViewDelegate
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGPoint point = scrollView.contentOffset;
    if (point.x > 0 || point.x < 0) {
        //网页滚动时控制水平位置
        scrollView.contentOffset = CGPointMake(0, point.y);
    }
}

activityIndicatorView and webView.png