如何在Objective-C中單擊UILabel上的超鏈接打開視圖控制器

我必須通過UILabel. 這對我來說只奏效了一半。我不能UITextView根據我的專案要求使用。

以下代碼在 a 上創建一個超鏈接UILabel并檢測鏈接上的觸摸，但我想打開一個視圖控制器而不是 URL。

@property (weak, nonatomic) @IBOutlet UILabel *label;
NSLayoutManager *layoutManager;
NSTextContainer *textContainer;
NSTextStorage *textStorage;

在 a 上創建超鏈接UILabel：

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"String with a link" attributes:nil];
NSRange linkRange = NSMakeRange(14, 4);
NSDictionary *linkAttributes = @{ NSForegroundColorAttributeName : [UIColor colorWithRed:0.05 green:0.4 blue:0.65 alpha:1.0],
                                  NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) };
[attributedString setAttributes:linkAttributes range:linkRange];
_label.attributedText = attributedString;

// 檢測對此超鏈接的觸摸。

_label.userInteractionEnabled = YES;
[_label addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapOnLabel:)]];

要找出點擊是在鏈接上，而不是在標簽的任何其他部分。

// 創建 NSLayoutManager、NSTextContainer 和 NSTextStorage 的實體

layoutManager = [[NSLayoutManager alloc] init];
textContainer = [[NSTextContainer alloc] initWithSize:CGSizeZero];
textStorage = [[NSTextStorage alloc] initWithAttributedString:attributedString];

// 配置 layoutManager、textStorage 和 textContainer

[layoutManager addTextContainer:textContainer];

[textStorage addLayoutManager:layoutManager];

textContainer.lineFragmentPadding = 0.0;
textContainer.lineBreakMode = _label.lineBreakMode;
textContainer.maximumNumberOfLines =_label.numberOfLines;

// 每次標簽改變其框架時，更新 textContainer 的大小：

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    textContainer.size = self.label.bounds.size;
}

// 檢測點擊是否正好在鏈接上：

- (void)handleTapOnLabel:(UITapGestureRecognizer *)tapGesture
{
    CGPoint locationOfTouchInLabel = [tapGesture locationInView:tapGesture.view];
    CGSize labelSize = tapGesture.view.bounds.size;
    CGRect textBoundingBox = [layoutManager usedRectForTextContainer:textContainer];
    CGPoint textContainerOffset = CGPointMake((labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
                                              (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);
    CGPoint locationOfTouchInTextContainer = CGPointMake(locationOfTouchInLabel.x - textContainerOffset.x,
                                                         locationOfTouchInLabel.y - textContainerOffset.y);
    NSInteger indexOfCharacter = [layoutManager characterIndexForPoint:locationOfTouchInTextContainer
                                                       inTextContainer:textContainer
                              fractionOfDistanceBetweenInsertionPoints:nil];
    NSRange linkRange = NSMakeRange(14, 4);
    if (NSLocationInRange(indexOfCharacter, linkRange)) {
        // Open an URL, or handle the tap on the link in any other way
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://stackoverflow.com/"]];
    }
}

// 使用這個函式來呈現 newViewController

-(void)navigateToTATViewController{
    TATViewController *tatVC = [[self getStoryboardWithStoryboardType: kListingStoryboard] instantiateViewControllerWithIdentifier: @"TATViewControllerID"];
    [self.navigationController presentViewController: tatVC animated:true completion:nil];
}

uj5u.com熱心網友回復：

所以基本上你需要更新這一行：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://stackoverflow.com/"]];

并將其替換為[self navigateToTATViewController];

標籤：IOS 目标-c 超链接 uitap手势识别器

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