为WBShareKit增加程序内登陆认证(UIWebView)

转自Rainbird的个人博客

WBShareKit是什么
WBShareKit是一个支持新浪微博，腾讯微博，豆瓣说，发推，网易微博等登陆，发布的开源库，认证方式使用的oauth。
官方地址是：WBShareKit
个人觉得WBShareKit是国内鲜有的优秀开源库之一。在微博大行其道的今天，很少有人将这么多的微博登陆封装到一块，当然不排除有这样的牛人，估计大多也都是有开源的心，没有开源的勇气。笔者很庆幸在接到程序内发微博的任务的时候遇到了WBShareKit，你不知道这样节省了我多少的时间。
WBShareKit用了挺久了，很稳定用着也很顺手，唯一觉得不大爽的地方就是用户登陆的时候，都是用的系统自带的safari实现的。这样的话，如果用户登陆不成功，会造成一定数量的用户流失。笔者当时也想过给WBShareKit加上程序内登陆的功能，无耐功力有限，觉得无从下手。当头两天这个任务再次被提上来了，竟然用了几个小时的时间给搞定了。不敢独享特整理出来，方便更多有这样需求的人。

主要改动:
WBShareKit.h 增加了一个UIWebViewDelegate,以及一个View

@interface WBShareKit : NSObject<UIWebViewDelegate>{
  SEL _successSEL;
  SEL _failSEL;
}
@property (nonatomic, retain) UIView *safariView;

WBShareKit.m 系统方面，初始化并销毁新创建的view

+ (WBShareKit *)mainShare{
  if (nil == _shareKit) {
    _shareKit = [[WBShareKit alloc] init];
    _shareKit.safariView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
  }
  return _shareKit;
}

- (void)dealloc{
  [safariView release];
  [super dealloc];
}

以下是大段的新添加的代码，直接添加到了WBShareKit.m文件的最下方

#pragma mark - safariView 弹出动画
#define kTransitionDuration 0.3
- (CGAffineTransform)transformForOrientation {
  UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
  if (orientation == UIInterfaceOrientationLandscapeLeft) {
    return CGAffineTransformMakeRotation(M_PI*1.5);
  } else if (orientation == UIInterfaceOrientationLandscapeRight) {
    return CGAffineTransformMakeRotation(M_PI/2);
  } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
    return CGAffineTransformMakeRotation(-M_PI);
  } else {
    return CGAffineTransformIdentity;
  }
}

- (void)bounce1AnimationStopped {
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:kTransitionDuration/2];
  [UIView setAnimationDelegate:self];
  [UIView setAnimationDidStopSelector:@selector(bounce2AnimationStopped)];
  safariView.transform = CGAffineTransformScale([self transformForOrientation], 0.9, 0.9);
  [UIView commitAnimations];
}

- (void)bounce2AnimationStopped {
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:kTransitionDuration/2];
  safariView.transform = [self transformForOrientation];
  [UIView commitAnimations];
}

#pragma mark - 显示safariView 程序内登陆的界面
- (void)doShowSafariWebView:(NSString *)_url{
  if ([safariView.subviews count] == 0) {
    //添加一个头
    UIButton *titleBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    [titleBtn setBackgroundImage:[UIImage imageNamed:@"head"]
                        forState:UIControlStateHighlighted];
    [titleBtn setBackgroundImage:[UIImage imageNamed:@"head"]
                        forState:UIControlStateNormal];
    [safariView addSubview:titleBtn];
    [titleBtn release];
    
    UIButton *backBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 60, 45)];
    [backBtn setTitle:@"取消" forState:UIControlStateNormal];
    backBtn.titleLabel.font = [UIFont systemFontOfSize:14];
    backBtn.titleLabel.adjustsFontSizeToFitWidth = TRUE;
    [backBtn addTarget:self
                action:@selector(removeSafariview)
      forControlEvents:UIControlEventTouchUpInside];
    [backBtn setBackgroundImage:[UIImage imageNamed:@"bianji.png"] 
                       forState:UIControlStateNormal];
    [backBtn setBackgroundImage:[UIImage imageNamed:@"bianjidown.png"] 
                       forState:UIControlStateHighlighted];
    [safariView addSubview:backBtn];
    [backBtn release];
    

    UIWebView *_curWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 416)];
    _curWebView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    _curWebView.delegate = self;
    [_curWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:_url]]];
    _curWebView.tag = 5;
    [safariView addSubview:_curWebView];
    [_curWebView release];
    
  }
  else {
    UIView *_curWebView = [safariView viewWithTag:5];
    [(UIWebView *)_curWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:_url]]];
  }
  UIWindow *window = [UIApplication sharedApplication].keyWindow;
  if (!window) {
    window = [[UIApplication sharedApplication].windows objectAtIndex:0];
  }
  [window addSubview:safariView];

  safariView.frame = CGRectMake(0, 20, 320, 460);
  
  safariView.transform = CGAffineTransformScale([self transformForOrientation], 0.001, 0.001);
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:kTransitionDuration/1.5];
  [UIView setAnimationDelegate:self];
  [UIView setAnimationDidStopSelector:@selector(bounce1AnimationStopped)];
  safariView.transform = CGAffineTransformScale([self transformForOrientation], 1.1, 1.1);
  [UIView commitAnimations];
}

- (void)removeSafariview{
  [safariView removeFromSuperview];
  UIView *_curWebView = [safariView viewWithTag:5];
  [(UIWebView *)_curWebView loadHTMLString:@"" baseURL:nil];
}
#pragma mark - UIWebViewDelegate
- (BOOL)webView:(UIWebView *)webView 
shouldStartLoadWithRequest:(NSURLRequest *)request 
 navigationType:(UIWebViewNavigationType)navigationType{
  if ([[request.URL absoluteString] hasPrefix:CallBackURL]) {
    [self handleOpenURL:request.URL];
    [self removeSafariview];
    return NO;
  }
  else {
    return YES;
  }
  
}

在WBShareKit.m中间做的操作就是把

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];

替换为:

[self performSelector:@selector(doShowSafariWebView:) withObject:url];

然后就是添加了三个图片文件，that’s all
我是今天新下载的代码：
原始代码 修改后的代码
最后再次对WBShareKit作者的开源精神表示崇高的敬意！开源万岁！