在JSON中檢測鏈接並使它們可點擊iOS

Question

在我的應用程序中，我正在解析來自服務器上JSON文件的文本。在一些帖子（文本）中有鏈接。但現在我無法點擊鏈接。這只是一個乾淨的文字和帖子，出現在我的文本視圖中。那麼，我該如何檢測這個JSON文本中的鏈接並使它們可點擊並在Safari中打開？

這裏是我的代碼解析的帖子：

#import "DEMOSecondViewController.h" 
#import "DEMONavigationController.h" 
#import "PostsObject.h" 
#import "RNBlurModalView.h" 
#import "AFNetworking.h" 
#import "PostsNextView.h" 

#import "KIImagePager.h" 
#import "TableHeaderView.h" 

#import "DEMOMenuViewController.h" 
#import "UIViewController+REFrostedViewController.h" 

@interface DEMOSecondViewController() 
@end 

@implementation DEMOSecondViewController 
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView; 
@synthesize fontForCellText; 
@synthesize btnFaceBook, btnTwitter, btnTwitter2; 
@synthesize strURLToLoad; 
@synthesize movies; 

- (IBAction)showButtonMenu { 
    [self.frostedViewController presentMenuViewController]; 
} 

- (void)refresh:(UIRefreshControl *)refreshControl { 
    [refreshControl endRefreshing]; 
} 

-(UIStatusBarStyle)preferredStatusBarStyle{ 
    return UIStatusBarStyleLightContent; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init]; 
    [refreshControl setTintColor:[UIColor whiteColor]]; 
    [refreshControl addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventValueChanged]; 
    [self.tableView addSubview:refreshControl]; 

    strURLToLoad = [[NSMutableString alloc] init]; 

    [btnFaceBook setTitle:@"json-1.php/file.json" forState:UIControlStateDisabled]; 
    [btnTwitter setTitle:@"json-2.php/file.json" forState:UIControlStateDisabled]; 
    [btnTwitter2 setTitle:@"json-3.php/file.json" forState:UIControlStateDisabled]; 

    [btnFaceBook setTag:@"facebookButton"]; 
    [btnTwitter setTag:@"twitterButton"]; 
    [btnTwitter2 setTag:@"twitter2Button"]; 

    [btnFaceBook setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal]; 
    [btnFaceBook setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected]; 

    [btnTwitter setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal]; 
    [btnTwitter setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected]; 

    [btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"tab_selected.png"] forState:UIControlStateNormal]; 
    [btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"tab_unselected.png"] forState:UIControlStateSelected]; 

    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil]; 
    PostsObject *cell = [nib objectAtIndex:0]; 
    fontForCellText = cell.title.font; 
    cellTextWidth = cell.title.frame.size.width; 
    cellHeightExceptText = cell.frame.size.height - cell.title.frame.size.height; 

    [self.navigationController setNavigationBarHidden:YES]; 

    self.tableView.separatorColor = [UIColor clearColor]; 

    // Setting Up Activity Indicator View 
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 

    self.activityIndicatorView.color = [UIColor grayColor]; 

    self.activityIndicatorView.hidesWhenStopped = YES; 
    self.activityIndicatorView.center = self.view.center; 
    [self.view addSubview:self.activityIndicatorView]; 
    [self.activityIndicatorView startAnimating]; 
    self.tableView.separatorColor = [UIColor clearColor]; 

    // Initializing Data Source 
    movies = [[NSMutableArray alloc] init]; 

    [self btnFromTabBarClicked:btnFaceBook]; 
} 

- (void)loadJSONFromCurrentURL 
{ 
    [self.activityIndicatorView startAnimating]; 

    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:strURLToLoad]]; 

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) { 
     [movies setArray:JSON]; 
     [self.activityIndicatorView stopAnimating]; 
     [self.tableView reloadData]; 

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { 
     NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo); 
    }]; 

    [operation start]; 
} 

- (IBAction)btnFromTabBarClicked:(UIButton *)sender 
{ 
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO; 

    sender.selected = YES; 

    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]]; 

    [self loadJSONFromCurrentURL]; 
} 

// Table View Data Source Methods 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 

    return movies.count; 

} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return 1; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

    static NSString *Identifier2 = @"PostsObject"; 

    PostsObject *cell = [tableView dequeueReusableCellWithIdentifier:Identifier2]; 
    if (cell == nil) { 
     NSArray *nib= [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil]; 
     cell = (PostsObject *)[nib objectAtIndex:0]; 

     cell.backgroundColor = [UIColor clearColor]; 

     UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"celeb_b3.jpg"]]; 
     [tempImageView setFrame:self.tableView.frame]; 

     self.tableView.backgroundView = tempImageView; 
    } 

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row]; 
    NSString *strText = [movie objectForKey:[self getTextKey]]; 

    CGRect rect = cell.title.frame; 
    rect.size.height = [self getHeightForText:strText]; 
    cell.title.frame = rect; 
    cell.title.text = strText; 
    cell.arrow.center = CGPointMake(cell.arrow.frame.origin.x, rect.origin.y + rect.size.height/2); 
    cell.published.text = [movie objectForKey:[self getPostedTime]]; 
    cell.twitterName.text = [movie objectForKey:[self getTwitterName]]; 

    return cell; 
} 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //get the data you want to pass 
    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row]; 

    // Allocate second view you want to open 
    PostsNextView *newView = [[PostsNextView alloc] init]; 
    // pass the data 
    newView.theMovie = movie; 

    // present view 
    [self.navigationController pushViewController:newView animated:YES]; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row]; 
    NSString *strText = [movie objectForKey:[self getTextKey]]; 

    CGFloat cellHeight = cellHeightExceptText + [self getHeightForText:strText]; 
    return cellHeight; 

} 

- (NSString *)getTextKey 
{ 
    return btnTwitter.selected?@"message":@"message"; 
} 

- (NSString *)getPostedTime 
{ 
    return btnTwitter.selected?@"posted":@"published"; 
} 

- (NSString *)getTwitterName 
{ 
    return btnTwitter2.selected?@"user":@"celebname"; 
} 

- (CGFloat)getHeightForText:(NSString *)strText 
{ 
    CGSize constraintSize = CGSizeMake(cellTextWidth, MAXFLOAT); 
    CGSize labelSize = [strText sizeWithFont:fontForCellText constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping]; 
    NSLog(@"labelSize.height = %f",labelSize.height); 
    return labelSize.height; 
} 


@end 

Answer 1

您可以使用NSRegularExpression和類似的模式：

((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)

識別URL的範圍在你的字符串，然後使用NSAttributedString來創建帶有可點擊鏈接的字符串以放置在UILabel和其他控件中。