在 iOS 7 中创建通用搜索文本字段(谷歌和网址)

我们如何像在iOS 7 safari中那样创建一个通用搜索文本字段。我知道如何创建一个谷歌搜索字段，但我如何创建一个同时具有谷歌搜索和URL搜索的文本字段。

谷歌搜索字段：

    -(void)SearchButtonClicked {
        NSString *query = [maintext.text stringByReplacingOccurrencesOfString:@" " withString:@"+"];
        NSString *urlString = [NSString stringWithFormat:@"%@", query];
        // remember to change the view controller class in storyboard
        MyWebViewController *webViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"WebView"];
        // urlString is a public property on MyWebViewController
        webViewController.urlString = urlString;
        [self presentViewController:webViewController animated:YES completion:nil];  
    }
    - (IBAction)SearchButton:(id)sender {
        NSString *query = [maintext.text stringByReplacingOccurrencesOfString:@" " withString:@"+"];
        NSString *urlString = [NSString stringWithFormat:@"http://www.google.com/search?q=%@", query];
        // remember to change the view controller class in storyboard
        MyWebViewController *webViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"WebView"];
        // urlString is a public property on MyWebViewController
        webViewController.urlString = urlString;
        [self presentViewController:webViewController animated:YES completion:nil];
}

我的网页视图控制器：

#import "MyWebViewController.h"
#import "ViewController.h"
#import <Social/Social.h>
#import "SIAlertView.h"
#import "TTAlertView.h"
#import "ETActivityIndicatorView.h"

@implementation MyWebViewController {

}
@synthesize searchField;
@synthesize webView;
ETActivityIndicatorView * etActivity;
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    NSURL *url = [NSURL URLWithString:self.urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:request];

}
-(void)webView:(UIWebView *)webBlog didFailLoadWithError:(NSError *)error{
    if ([error code] != -999) {
        NSLog(@"Could not load the dumb webPage");
        //show error alert, etc.
        TTAlertView *alert = [[TTAlertView alloc] initWithTitle:@"Internet Error"
                                                        message:@"Searched cannot open the page because your iPhone is not connected to the internet."
                                                       delegate:self
                                              cancelButtonTitle:@"Dismiss"
                                              otherButtonTitles:nil];
        [alert show];
        [etActivity setHidden:YES];

    }else{
        NSLog(@"Could not load the dumb web page...just might blame user!");
    }
}

//Called whenever the view starts loading something
- (void)webViewDidStartLoad:(UIWebView *)webView {
    [etActivity startAnimating];
    [etActivity setHidden:NO];
}
//Called whenever the view finished loading something
- (void)webViewDidFinishLoad:(UIWebView *)webView {
    [etActivity stopAnimating];
    [etActivity setHidden:YES];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [webView setDelegate:self];
    self.searchField.backgroundColor = [UIColor colorWithRed:255.0/255 green:255.0/255 blue:255.0/255 alpha:1.0f];
    self.searchField.layer.cornerRadius = 3.0f;
    self.searchField.placeholder = @"Search or enter address";
    self.searchField.leftViewMode = UITextFieldViewModeAlways;
    UIView* leftView1 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
    self.searchField.leftView = leftView1;
    //Setup handling of LEFT and RIGHT swipes
    UISwipeGestureRecognizer *recognizer;
    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
    [[self view] addGestureRecognizer:recognizer];

    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
    [[self view] addGestureRecognizer:recognizer];
    self.searchField.delegate = self;
    //ETActivityIndicatorView
    etActivity = [[ETActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 60.0f, 60.0f)];
    etActivity.center=self.view.center;
    //you can set your custom color for ETActivityIndicatorView
    etActivity.color = [UIColor colorWithRed:13.0/255 green:136.0/255 blue:236.0/255 alpha:1.0f];
    [self.view addSubview:etActivity];
}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
    if (recognizer.direction == UISwipeGestureRecognizerDirectionRight) {
        NSLog(@"Swipe Right");
          [webView goBack];
    }
    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"Swipe Left");
         [webView goForward];
    }
}

#pragma mark - RNGridMenuDelegate
- (void)gridMenu:(RNGridMenu *)gridMenu willDismissWithSelectedItem:(RNGridMenuItem *)item atIndex:(NSInteger)itemIndex {
    if (itemIndex == 0) {
        NSLog(@"Reload");
        [self.webView reload];
    }
    if (itemIndex == 1) {
        NSLog(@"Facebook");
        if([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) //check if Facebook Account is linked
        {
            mySLComposerSheet = [[SLComposeViewController alloc] init]; //initiate the Social Controller
            mySLComposerSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook]; //Tell him with what social plattform to use it, e.g. facebook or twitter
            [mySLComposerSheet setInitialText:[NSString stringWithFormat:@""]]; //the message you want to post
                       [self presentViewController:mySLComposerSheet animated:YES completion:nil];
        }
        [mySLComposerSheet setCompletionHandler:^(SLComposeViewControllerResult result) {
            switch (result) {
                case SLComposeViewControllerResultCancelled:
                    break;
                case SLComposeViewControllerResultDone:
                    break;
                default:
                    break;
            } //check if everything worked properly. Give out a message on the state.
        }];

    }
    if (itemIndex == 2) {
        if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter])
        {
            SLComposeViewController *tweetSheet = [SLComposeViewController
                                                   composeViewControllerForServiceType:SLServiceTypeTwitter];
            [tweetSheet setInitialText:@""];
            [self presentViewController:tweetSheet animated:YES completion:nil];
        }
    }
    if (itemIndex == 3) {
        NSLog(@"Home");
        MyWebViewController *MainView = [self.storyboard instantiateViewControllerWithIdentifier:@"MainView"];
        [self presentViewController:MainView animated:NO completion:nil];
    }
}


- (void)showList {
    NSInteger numberOfOptions = 4;
    NSArray *options = @[
                         @"Reload",
                         @"Facebook",
                         @"Twitter",
                         @"Home",
                         ];
    RNGridMenu *av = [[RNGridMenu alloc] initWithTitles:[options subarrayWithRange:NSMakeRange(0, numberOfOptions)]];
    av.delegate = self;
    av.itemFont = [UIFont boldSystemFontOfSize:18];
    av.itemSize = CGSizeMake(150, 55);
    [av showInViewController:self center:CGPointMake(self.view.bounds.size.width/2.f, self.view.bounds.size.height/2.f)];
}

- (IBAction)onShowButton:(id)sender {
    [self showList];
}

![enter image description here][1]

在以下情况下，谷歌浏览器假定键入的文本是网址：

文本不包含空格(一个单词(：
1. 以有效且可接受的 URI 方案(如 http、https 和 ftp (开头。
2. 以正斜杠 ( / ( 开头。
3. 以有效的 TLD 结尾(参见 1、2、3(。
4. 以正斜杠 ( / ( 结尾。
5. 已知主机名(如 localhost (。
6. 有效的 IP 地址。
文本包含空格(多个单词(：
1. 以正斜杠 ( / ( 开头。
文本包含一个问号(?(和前面的部分可以假定为URL。

在所有其他情况下，您可以放心地假定键入的文本是搜索词。

这不是一个完整的规则列表，但我认为它对于常规使用来说绰绰有余。

主要参考：铬-多功能箱设计原则。

更新：

以下是一些提示，可帮助您将以前的规则转换为工作代码(顺序很重要(：

(规则 3( 替换与此正则表达式匹配的文本部分：
```
?.*$
```
使用空字符串@""，然后应用其他规则。

、1.4、1.5 和2.1(匹配此正则表达式：

^((/)|((https?|ftp):S+$)|(S+/$)|(localhost$))

(规则 1.3(您可以从上面的链接中收集一些流行的 TLD，并从中形成一个正则表达式，如下所示：
```
S+.(com|net|org|....)$
```

(规则 1.6( 匹配此正则表达式：

^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([0-9]|[1-9][0-9]|1[0-9‌]{2}|2[0-4][0-9]|25[0-5])$

使用此代码。这基本上检查输入到文本字段中的文本。如果它是一个完整的网址，那么它会直接重定向到它，否则输入的文本会在谷歌上搜索。

- (IBAction)SearchButton:(id)sender 
{
    MyWebViewController *webViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"WebView"];
    NSString *urlString = maintext.text;
    if([urlString rangeOfString:@"//"].location == NSNotFound)
    {
        // to resolve a url according to rfc 1808 (the most common form of URL), it must contain '//' in it.
        // appending '//' in the url string to check for valid url
        urlString = [NSString stringWithFormat:@"//%@", urlString];
    }
    NSURL *url = [NSURL URLWithString:urlString];
    if(url && (url.scheme || url.host) && ([urlString rangeOfString:@"."].location != NSNotFound))
    {
       // url is valid, it contains domain and host
        webViewController.urlString = maintext.text;
    }
    else 
    {
        NSString *query = [maintext.text stringByReplacingOccurrencesOfString:@" " withString:@"+"];
        NSString *urlString = [NSString stringWithFormat:@"http://www.google.com/search?q=%@", query];
        // urlString is a public property on MyWebViewController
        webViewController.urlString = urlString;
    }
    [self presentViewController:webViewController animated:YES completion:nil];
}

对于额外的检查，您还可以检查 url 是否有效，就像 ping 它并检查它是否响应一样。

您可以创建一个类别：

@interface NSString (NSStringValidator)
- (BOOL)isValidEmail;
- (BOOL)isValidURL;
@end
@implementation NSString (NSStringValidator)
- (BOOL)isValidEmail {
    NSString *regExpPattern = @"\b([a-zA-Z0-9%_.+\-]+)@([a-zA-Z0-9.\-]+?\.[a-zA-Z]{2,6})\b";
    NSError *errorNext = NULL;
    NSRegularExpression *regexNext = [NSRegularExpression regularExpressionWithPattern:regExpPattern
                                                                               options:NSRegularExpressionCaseInsensitive
                                                                                 error:&errorNext];
    NSRange range = [regexNext rangeOfFirstMatchInString:self
                                                 options:NSRegularExpressionCaseInsensitive
                                                   range:NSMakeRange(0, self.length)];
    return NSEqualRanges(range, NSMakeRange(0, self.length));
}
- (BOOL)isValidURL {
    NSString *regExpPattern = @"(?i)(?:(?:https?):\/\/)?(?:\S+(?::\S*)?@)?(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:\/[^\s]*)?";
    NSError *errorNext = NULL;
    NSRegularExpression *regexNext = [NSRegularExpression regularExpressionWithPattern:regExpPattern
                                                                               options:NSRegularExpressionCaseInsensitive
                                                                                 error:&errorNext];
    NSRange range = [regexNext rangeOfFirstMatchInString:self
                                                 options:NSRegularExpressionCaseInsensitive
                                                   range:NSMakeRange(0, self.length)];
    return NSEqualRanges(range, NSMakeRange(0, self.length));
}
@end

然后调用类别方法：

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField
{
    [theTextField resignFirstResponder];
    if (theTextField.text.isValidURL) {
        //open site
    } else {
        //search text
    }
    return YES;
}

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