UIWebView头文件研读

//
//  UIWebView.h
//  UIKit
//
//  Copyright (c) 2007-2011, Apple Inc. All rights reserved.
//

typedef enum {
    UIWebViewNavigationTypeLinkClicked,  //链接类型，html中的超级链接
    UIWebViewNavigationTypeFormSubmitted, //html表单提交
    UIWebViewNavigationTypeBackForward,  //html 触发返回操作
    UIWebViewNavigationTypeReload,    //html 刷新当前页
    UIWebViewNavigationTypeFormResubmitted, //html 表单再提交
    UIWebViewNavigationTypeOther  //其他
} UIWebViewNavigationType;  //点击webview中的某些事件时的类型，js控制本地函数

@class UIWebViewInternal;
@protocol UIWebViewDelegate;

UIKIT_CLASS_AVAILABLE(2_0) @interface UIWebView : UIView {
 @private
    UIWebViewInternal *_internal;
}

@property(nonatomic,assign) id delegate;

@property(nonatomic,readonly,retain) UIScrollView *scrollView __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_5_0);

//加载web内容 有三种方式
- (void)loadRequest:(NSURLRequest *)request;
- (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL;
- (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL;

@property(nonatomic,readonly,retain) NSURLRequest *request;

- (void)reload;
- (void)stopLoading;

- (void)goBack;
- (void)goForward;

@property(nonatomic,readonly,getter=canGoBack) BOOL canGoBack;
@property(nonatomic,readonly,getter=canGoForward) BOOL canGoForward;
@property(nonatomic,readonly,getter=isLoading) BOOL loading;

//在webview中操作html网页
- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;

@property(nonatomic) BOOL scalesPageToFit;

@property(nonatomic) BOOL detectsPhoneNumbers __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA, __MAC_NA, __IPHONE_2_0, __IPHONE_3_0);
@property(nonatomic) UIDataDetectorTypes dataDetectorTypes __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_3_0);

@property (nonatomic) BOOL allowsInlineMediaPlayback __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_4_0); // iPhone Safari defaults to NO. iPad Safari defaults to YES
@property (nonatomic) BOOL mediaPlaybackRequiresUserAction __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_4_0); // iPhone and iPad Safari both default to YES

@property (nonatomic) BOOL mediaPlaybackAllowsAirPlay __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_5_0); // iPhone and iPad Safari both default to YES

@end

@protocol UIWebViewDelegate

@optional
//在js中操作webview中的object-c方法  如果获取设备信息  调摄像头等 web内容将要开始请求
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
//web内容已开始加载的回调
- (void)webViewDidStartLoad:(UIWebView *)webView;
//web内容已经加载完毕的回调
- (void)webViewDidFinishLoad:(UIWebView *)webView;
//web内容加载失败的回调
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;

@end