WKWebView基本使用

WKWebView的基本使用和几个基本的代理方法

#import "ViewController.h"
#import <WebKit/WebKit.h>
@interface ViewController ()<WKNavigationDelegate,WKUIDelegate>
@property(nonatomic,strong)WKWebView *webView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIImage *bgImage = [UIImage imageNamed:@"圆角矩形"];
    [self.navigationController.navigationBar setBackgroundImage:bgImage forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setBackgroundColor:[UIColor clearColor]];
    // Do any additional setup after loading the view, typically from a nib.
    self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.hao123.com"]]];
    self.webView.navigationDelegate = self;
    self.webView.allowsBackForwardNavigationGestures = YES;
    [self.view addSubview:self.webView];
}

-(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation
{
    NSLog(@"当页面开始加载时");
}
-(void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation
{
    NSLog(@"当内容开始返回时调用");
}
-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
    NSLog(@"页面加载完成之后调用");
    [_webView evaluateJavaScript:@"document.body.offsetHeight" completionHandler:^(id _Nullable result, NSError * _Nullable error) {
        NSLog(@"abc:%f",[result doubleValue]);
    }];

}
-(void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(nonnull NSError *)error
{
    NSLog(@"页面加载失败时调用");
}
//页面跳转的代理方法
-(void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation
{
    NSLog(@" 接收到服务器跳转请求之后调用");
}
-(void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
{
    NSLog(@"在收到响应后，决定是否跳转");
    NSLog(@"%@",navigationResponse.response);
    decisionHandler(WKNavigationResponsePolicyAllow);

}
-(void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSLog(@"在发送请求之前，决定是否跳转");
    NSLog(@"%@",navigationAction.request.URL.absoluteString);
    if ([navigationAction.request.URL.absoluteString rangeOfString:@"https://www.baidu.com"].location != NSNotFound) {
        decisionHandler(WKNavigationActionPolicyAllow);
    }else{
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}