webview中事件的用法

封装 MBProgressHud

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#import "MBProgressHUD.h"

@interface MBProgressHUD (Add)
+ (void)showError:(NSString *)error toView:(UIView *)view;

+ (MBProgressHUD *)showMessag:(NSString *)message toView:(UIView *)view;
@end

============================
#import "MBProgressHUD+Add.h"

@implementation MBProgressHUD (Add)
#pragma mark 显示错误信息
+ (void)showError:(NSString *)error toView:(UIView *)view{
    // 快速显示一个提示信息
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:view animated:YES];
    hud.labelText = error;
    // 设置图片
    hud.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"alert_failed_icon.png"]] autorelease];
    // 再设置模式
    hud.mode = MBProgressHUDModeCustomView;
    
    // 隐藏时候从父控件中移除
    hud.removeFromSuperViewOnHide = YES;
    
    // 1秒之后再消失
    [hud hide:YES afterDelay:1];
}

#pragma mark 显示一些信息
+ (MBProgressHUD *)showMessag:(NSString *)message toView:(UIView *)view {
    // 快速显示一个提示信息
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:view animated:YES];
    hud.labelText = message;
    // 隐藏时候从父控件中移除
    hud.removeFromSuperViewOnHide = YES;
    
    // YES代表需要蒙版效果
    //hud.dimBackground = YES;
    
    return hud;
}
@end

webview中MBPress的用法

#import "OauthController.h"
#import "MBProgressHUD+Add.h"
#import "WeiboAccount.h"
#import "User.h"
#import "UserMgr.h"

@interface OauthController () {
    UIWebView *_webView;
}
@end

@implementation OauthController

#pragma mark - 生命周期方法
- (void)loadView {
    CGRect frame = [UIScreen mainScreen].applicationFrame;
    _webView = [[[UIWebView alloc] initWithFrame:frame] autorelease];
    self.view = _webView;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 授权成功后，会跳到回调地址，并且把access_token拼接到回调地址后面
    // reponse_type=token代表授权成功后直接返回access_token
    NSString *str = [kOAuthURL stringByAppendingFormat:@"?%@=%@&%@=%@&display=mobile&response_type=token", kClientId, kAppKey, kRedirectURIKey, kRedirectURI];
    
    [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:str]]];
    _webView.delegate = self;
}

#pragma mark - UIWebView代理方法
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSString *url = request.URL.absoluteString;
    NSRange range = [url rangeOfString:@"access_token"];
    int location = range.location;
    // 说明这是含有access_token的回调地址
    if (location != NSNotFound) {
        // 截取后面的参数字符串
        NSString *paramStr = [url substringFromIndex:location];
        // 切割所有的参数
        NSArray *params = [paramStr componentsSeparatedByString:@"&"];
        
        // access_token=2.00iEK52CsE94CDd31b67b95dEUONIB
        // expires_in=157678625
        // uid=2148327324
        
        // 初始化账号
        WeiboAccount *account = [WeiboAccount account];
        
        // 遍历所有的参数
        for (NSString *param in params) {
            NSRange tokenRange =  [param rangeOfString:kAccessToken];
            NSRange expiresRange =  [param rangeOfString:kExpiresIn];
            NSRange uidRange =  [param rangeOfString:KUid];
            
            // 找到了accessToken
            if (tokenRange.location != NSNotFound) {
                account.accessToken = [param substringFromIndex:tokenRange.location + tokenRange.length + 1];
            } else if(expiresRange.location != NSNotFound) {
                // 找到了expiresIn
                account.expiresIn = [[param substringFromIndex:expiresRange.location + expiresRange.length + 1] longLongValue];
                
            } else if(uidRange.location != NSNotFound) {
                // 找到了uid
                account.uid = [param substringFromIndex:uidRange.location + uidRange.length + 1];
            }
        }
        
        // 获取用户数据
        UserMgr *mgr = [UserMgr mgr];
        [mgr queryUserWithUid:account.uid];
        mgr.queryUserBlock = ^(User *user, NSString *error) {
            // 设置账号昵称
            account.screenName = user.screenName;
            
            // 将账号写入沙盒
            NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
            NSString *path = [documents stringByAppendingPathComponent:kAccountFile];
            [NSKeyedArchiver archiveRootObject:account toFile:path];
            
            
            [MBProgressHUD hideHUDForView:self.view animated:YES];
            // 关闭当前控制器
            [self dismissViewControllerAnimated:YES completion:nil];
        };
        
        
        return NO;
    }
    return YES;
}

- (void)webViewDidStartLoad:(UIWebView *)webView {
    self.title = kLoadingMsg;
    [MBProgressHUD showMessag:kLoadingMsg toView:self.view];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    self.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
    [MBProgressHUD hideHUDForView:self.view animated:YES];
}
@end