网页控件UIWebView

网页控件UIWebView 可以加载本地HTML代码或者网络资源。

通过Xcode创建简单的工程

storyboard上放这几个控件

.h文件

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UIWebView *webView;

- (IBAction)testLoadHTMLString:(UIButton *)sender;

- (IBAction)testLoadData:(UIButton *)sender;

- (IBAction)testLoadRequest:(UIButton *)sender;

@end

.m文件

#import "ViewController.h"

@interface ViewController ()<UIWebViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

//第一种方法 通过html字符串加载数据 加载本地html

- (IBAction)testLoadHTMLString:(UIButton *)sender {

    NSString *htmlPath = [[NSBundle mainBundle]pathForResource:@"index" ofType:@"html"];

    NSURL *bundleUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]; //得到了当前项目中的文件路径

    NSError *error = nil;

    NSString *html = [[NSString alloc]initWithContentsOfFile:htmlPath encoding:NSUTF8StringEncoding error:&error]; //将字符集指定为 NSUTF8StringEncoding

    if(error == nil){

        [self.webView loadHTMLString:html baseURL:bundleUrl]; //从当前路径加载html文件

    }

}

//第二种方法 加载本地html

- (IBAction)testLoadData:(UIButton *)sender {

    NSString *htmlPath = [[NSBundle mainBundle]pathForResource:@"index" ofType:@"html"];

    NSURL *bundleUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]; //得到了当前项目中的文件路径

    NSError *error = nil;

    NSData *htmlData = [[NSData alloc]initWithContentsOfFile:htmlPath];

    if(error == nil){

        [self.webView loadData:htmlData MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:bundleUrl];

    }

}

//第三种方法 异步加载 通过协议实现 UIWebViewDelegate 加载网络资源

- (IBAction)testLoadRequest:(UIButton *)sender {

    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"]; //遵循http协议 指定请求的网站

    NSURLRequest *request = [NSURLRequest requestWithURL:url];  //获取NSURLRequest对象

    [self.webView loadRequest:request]; //发起异步请求网络

    self.webView.delegate = self;

}

#pragma mark -UIWebViewDelegate

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

    //加载完成调用的方法

    NSLog(@"加载完成!");

    NSLog(@"%@",[webView stringByEvaluatingJavaScriptFromString:@"document.body.innerHTML"]); //得到JavaScript语句

}

- (void)webViewDidStartLoad:(UIWebView *)webView

{

    

}

//-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

//{

//    

//}

@end

运行结果: