#import <Foundation/Foundation.h>
#import <UIKit/UIView.h>
#import <UIKit/UIKitDefines.h>
#import <UIKit/UIDataDetectors.h>
#import <UIKit/UIScrollView.h>

typedef NS_ENUM(NSInteger, UIWebViewNavigationType) {
    UIWebViewNavigationTypeLinkClicked,
    UIWebViewNavigationTypeFormSubmitted,
    UIWebViewNavigationTypeBackForward,
    UIWebViewNavigationTypeReload,
    UIWebViewNavigationTypeFormResubmitted,
    UIWebViewNavigationTypeOther
};

typedef NS_ENUM(NSInteger, UIWebPaginationMode) {
    UIWebPaginationModeUnpaginated,
    UIWebPaginationModeLeftToRight,
    UIWebPaginationModeTopToBottom,
    UIWebPaginationModeBottomToTop,
    UIWebPaginationModeRightToLeft
};

typedef NS_ENUM(NSInteger, UIWebPaginationBreakingMode) {
    UIWebPaginationBreakingModePage,
    UIWebPaginationBreakingModeColumn
};

@class UIWebViewInternal;
@protocol UIWebViewDelegate;

#pragma - mark - UIWebView
NS_CLASS_AVAILABLE_IOS(2_0) @interface UIWebView : UIView <NSCoding, UIScrollViewDelegate> { 
 @private
    UIWebViewInternal *_internal;
}

@property(nonatomic,assign) id<UIWebViewDelegate> delegate;

@property(nonatomic,readonly,retain) UIScrollView *scrollView NS_AVAILABLE_IOS(5_0);

- (void)loadRequest:(NSURLRequest *)request;    // 加载请求
- (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL; // 加载HTML文件
// data为本地的数据文件的加载data文件 MIMEType是文件类型
- (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL;   // 通过这个方法来将网络上的数据保存到本地

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

- (void)reload;         // 重新加载
- (void)stopLoading;    // 停止加载

- (void)goBack;         // 返回上一页
- (void)goForward;      // 进入下一页

@property(nonatomic,readonly,getter=canGoBack) BOOL canGoBack;      // 是否返回上一页
@property(nonatomic,readonly,getter=canGoForward) BOOL canGoForward;    // 是否进入下一页
@property(nonatomic,readonly,getter=isLoading) BOOL loading;    // 是否正在加载

// 执行 JavaScript 代码
- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;

@property(nonatomic) BOOL scalesPageToFit; // 页面自动适应屏幕

@property(nonatomic) BOOL detectsPhoneNumbers NS_DEPRECATED_IOS(2_0, 3_0);

@property(nonatomic) UIDataDetectorTypes dataDetectorTypes NS_AVAILABLE_IOS(3_0);

@property (nonatomic) BOOL allowsInlineMediaPlayback NS_AVAILABLE_IOS(4_0);
@property (nonatomic) BOOL mediaPlaybackRequiresUserAction NS_AVAILABLE_IOS(4_0);

@property (nonatomic) BOOL mediaPlaybackAllowsAirPlay NS_AVAILABLE_IOS(5_0);

@property (nonatomic) BOOL suppressesIncrementalRendering NS_AVAILABLE_IOS(6_0);

@property (nonatomic) BOOL keyboardDisplayRequiresUserAction NS_AVAILABLE_IOS(6_0);

@property (nonatomic) UIWebPaginationMode paginationMode NS_AVAILABLE_IOS(7_0);
@property (nonatomic) UIWebPaginationBreakingMode paginationBreakingMode NS_AVAILABLE_IOS(7_0);
@property (nonatomic) CGFloat pageLength NS_AVAILABLE_IOS(7_0);
@property (nonatomic) CGFloat gapBetweenPages NS_AVAILABLE_IOS(7_0);
@property (nonatomic, readonly) NSUInteger pageCount NS_AVAILABLE_IOS(7_0);

@end

@protocol UIWebViewDelegate <NSObject>

@optional
// 是否开始加载请求，返回yes可以加载，返回no不能加载
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
// 开始加载后调用
- (void)webViewDidStartLoad:(UIWebView *)webView;
// 加载结束后调用
- (void)webViewDidFinishLoad:(UIWebView *)webView;
// 加载过程中出现错误后调用，可多次被调用
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;

@end