一 概述
IOS中用于展示网页内容的组件是UIWebView(过时了)和 WKWebView,本文主要介绍WKWebView
- 通过代码和布局两种方式添加WKWebView
- 为WKWebView添加标题
- 为WKWebView添加前进和后退按钮
二 通过代码和布局两种方式添加WKWebView
2.1 Storyboard布局方式
过程
- 布局文件中拖入WKWebView,并全屏显示
#import "WebKit/WebKit.h"
添加头文件
- 设置请求的requestWithURL
- Web view 通过loadRequest:request显示网页内容
代码
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| @interface ViewController () @property (weak, nonatomic) IBOutlet WKWebView *myWebview; @end
- (void)viewDidLoad { [super viewDidLoad]; NSURL *url=[NSURL URLWithString:@"https://www.baidu.com"]; NSURLRequest *request=[NSURLRequest requestWithURL:url]; [self.myWebview loadRequest:request]; }
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2.2 通过代码方式
过程
#import "WebKit/WebKit.h"
添加头文件
- 设置WKWebViewConfiguration
- 通过WKWebViewConfiguration和frame为WKWebViewConfiguration初始化
- 将webveiw添加到布局中
- 设置请求的requestWithURL
- Web view 通过loadRequest:request显示网页内容
代码
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| #import "WebKit/WebKit.h"
// 屏幕宽度 #define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width) // 屏幕高度 #define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height) @interface ViewController () @property(nonatomic,strong) IBOutlet WKWebView *webView; @end
-(void)loadView { [super loadView]; WKWebViewConfiguration *config=[[WKWebViewConfiguration alloc]init]; self.webView= [[WKWebView alloc]initWithFrame:CGRectMake(0, 60, SCREEN_WIDTH, SCREEN_HEIGHT)configuration:config]; [self.view addSubview:self.webView]; } - (void)viewDidLoad { [super viewDidLoad]; NSURL *url=[NSURL URLWithString:@"https://www.baidu.com"]; NSURLRequest *request=[NSURLRequest requestWithURL:url]; [self.webView loadRequest:request]; }
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2.3 效果图
三 为WKWebView添加标题
3.1 为ViewController嵌入Navigation导航条
一次点击:Editor——>Embed In——>Navigation Controller
嵌入之后到界面如图所示:
3.2 说明
- 遵循 WKNavigationDelegate协议
- 实现webView didFinishNavigation导航加载完成方法
- 在导航加载完成后,获取到webview的标题并设置
3.3 代码
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| @interface ViewController ()<WKNavigationDelegate> @property(nonatomic,strong) IBOutlet WKWebView *webView; @end
-(void)loadView { [super loadView]; WKWebViewConfiguration *config=[[WKWebViewConfiguration alloc]init]; self.webView= [[WKWebView alloc]initWithFrame:CGRectMake(0, 60, SCREEN_WIDTH, SCREEN_HEIGHT)configuration:config]; [self.view addSubview:self.webView]; self.webView.navigationDelegate=self; } - (void)viewDidLoad { [super viewDidLoad]; NSURL *url=[NSURL URLWithString:@"https://www.baidu.com"]; NSURLRequest *request=[NSURLRequest requestWithURL:url]; [self.webView loadRequest:request]; }
-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { self.navigationItem.title=webView.title; }
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3.4 效果图(显示 标题如:百度一下)
四 为WKWebView添加前进和后退按钮
4.2 逻辑
- 前进和后退按钮默认是不可用状态
- 网页加载完毕后,判断WebView能够执行goBack后退和goForward前进操作
- 如果能,则按钮高亮,说明可执行前进和后退操作
4.3 代码
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| #import "ViewController.h" #import "WebKit/WebKit.h" // 屏幕rect #define SCREEN_BOUNDS ([UIScreen mainScreen].bounds) // 屏幕宽度 #define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width) // 屏幕高度 #define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height) // 屏幕分辨率 #define SCREEN_RESOLUTION (SCREEN_WIDTH * SCREEN_HEIGHT * ([UIScreen mainScreen].scale))
@interface ViewController ()<WKNavigationDelegate> @property (weak, nonatomic) IBOutlet UIBarButtonItem *forward; @property (weak, nonatomic) IBOutlet UIBarButtonItem *back; @property(nonatomic,strong) IBOutlet WKWebView *webView;
@end
@implementation ViewController
-(void)loadView { [super loadView]; WKWebViewConfiguration *config=[[WKWebViewConfiguration alloc]init]; self.webView= [[WKWebView alloc]initWithFrame:CGRectMake(0, 60, SCREEN_WIDTH, SCREEN_HEIGHT)configuration:config]; [self.view addSubview:self.webView]; self.webView.navigationDelegate=self; }
- (void)viewDidLoad { [super viewDidLoad]; NSURL *url=[NSURL URLWithString:@"https://www.baidu.com"]; NSURLRequest *request=[NSURLRequest requestWithURL:url]; [self.webView loadRequest:request]; } - (IBAction)back:(UIBarButtonItem *)sender { [self.webView goBack]; } - (IBAction)forward:(id)sender { [self.webView goForward]; } #pragma mark-webview -(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { self.navigationItem.title=webView.title; //能否后退 self.back.enabled=[webView canGoBack]; self.forward.enabled=[webView canGoForward]; } @end
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4.3 效果图