1 #import "ViewController.h"
 2 
 3 @interface ViewController ()<UIWebViewDelegate>
 4 
 5 @property (nonatomic, weak) UIActivityIndicatorView *activeView;
 6 
 7 
 8 @end
 9 
10 @implementation ViewController
11 
12 - (void)viewDidLoad {
13     [super viewDidLoad];
14     
15     self.view.backgroundColor = [UIColor grayColor];
16     
17     UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
18 
19     [self.view addSubview:webView];
20     
21     webView.delegate = self;
22     
23 //    webView.scrollView.backgroundColor = [UIColor redColor];
24 //
25 //    webView.backgroundColor = [UIColor orangeColor];
26     
27 //    [webView setOpaque:NO];//opaque是不透明的意思
28     webView.dataDetectorTypes = UIDataDetectorTypeAll;//自动检测网页上的电话号码，单击可以拨打
29     [webView setScalesPageToFit:YES];//自动缩放以适应屏幕
30     
31     //加载网页的方式
32     //1.创建并加载远程网页
33     NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];
34     [webView loadRequest:[NSURLRequest requestWithURL:url]];
35     //2.加载本地文件资源
36      //NSURL *url = [NSURL fileURLWithPath:filePath];
37      //NSURLRequest *request = [NSURLRequest requestWithURL:url];
38      //[webView loadRequest:request];
39     //3.读入一个HTML，直接写入一个HTML代码
40     //NSString *htmlPath = [[[NSBundle mainBundle]bundlePath]stringByAppendingString:@"webapp/loadar.html"];
41     //NSString *htmlString = [NSString stringWithContentsOfURL:htmlPath encoding:NSUTF8StringEncoding error:NULL];
42     //[webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];
43     
44     UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
45 //    activityView.frame = CGRectMake(100, 100, 32, 32);
46     activityView.backgroundColor = [UIColor redColor];
47     activityView.center = CGPointMake([UIScreen mainScreen].bounds.size.width * .5, [UIScreen mainScreen].bounds.size.height * .5);
48     
49     
50     self.activeView = activityView;
51     [self.view addSubview:activityView];
52     
53     
54 }
55 
56 #pragma mark - UIWebView delegate
57 
58 // 开始加载的时候执行该方法。
59 - (void)webViewDidStartLoad:(UIWebView *)webView
60 {
61     NSLog(@"%s",__func__);
62     [self.activeView startAnimating] ;
63 }
64 
65 // 加载完成的时候执行该方法。
66 - (void)webViewDidFinishLoad:(UIWebView *)webView
67 {
68         NSLog(@"%s",__func__);
69     [self.activeView stopAnimating];
70 }
71 
72 // 有错误会来到这里
73 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
74 {
75     NSLog(@"%s -- %@",__func__,error);
76 }
77 
78 // 每次请求的url地址 都会调用这个函数。返回yes表示加载。否则不加载
79 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
80     
81     NSLog(@"%s -- %@ -- %ld",__func__,request,navigationType);
82     
83     return YES;
84 }
85 
86 @end