如何在 UILabel 中选择特定单词（Swift 2.0）？

Question

我一整天都面临一个大问题，可能有一个简单的解决方案。我有一个UILabel，其中包含一个NSAttributedString。我希望UILabel 中的特定范围可以点击。我不想要任何第三方功能。

这是我的示例代码：

let str = dict["itemName"] as! NSString
range = string.rangeOfString(dict["itemName"] as! String)!
index = string.startIndex.distanceTo(range.startIndex)
attributedString.addAttribute(NSForegroundColorAttributeName, value: color, range: NSRange(location: index, length: str.length))

Answer 1

您可以使用 UITextview 并为其添加点击手势，而不是使用 UILabel。这是一个例子，你可以达到同样的效果。

/* Set Tap gesture on Text view */

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapResponse:)];
tapGesture.numberOfTapsRequired = 1;
[yourTextView addGestureRecognizer:tapGesture];

- (void) tapResponse:(UITapGestureRecognizer *)recognizer
{

UITextView *textView =  (UITextView *)recognizer.view;
CGPoint location = [recognizer locationInView:textView];

CGPoint position = CGPointMake(location.x, location.y);

//get location in text from textposition at point
UITextPosition *tapPosition = [textView closestPositionToPoint:position];

//fetch the word at this position (or nil, if not available)
UITextRange *textRange = [textView.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
NSString *tappedWord = [textView textInRange:textRange];

NSLog(@"tapped word : %@", tappedWord);    
}

Answer 2

**ClickableTextView.h**

@protocol ClickableTextViewDelegate <NSObject>

@required
-(void)textview:(UITextView *)clickableTextView clickedText:(NSString *)text;

@end

@interface ClickableTextView : UITextView

@property (weak, nonatomic) id <ClickableTextViewDelegate> tapDelegate;

-(instancetype)initWithDelegate:(id)delegate;

@end


**ClickableTextView.m**

-(void)awakeFromNib {
    [super awakeFromNib];

    [self setProperties];
}


-(void)setProperties {

  self.userInteractionEnabled = YES;
  self.editable = NO;
  self.scrollEnabled = NO;
  self.textContainerInset = UIEdgeInsetsMake(0, 0, 0, 0);
  self.dataDetectorTypes = UIDataDetectorTypeLink;
  self.backgroundColor = [UIColor clearColor];

  /* Set Tap gesture on Text view */
  UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapResponse:)];
  tapGesture.numberOfTapsRequired = 1;
  [self addGestureRecognizer:tapGesture];

}

- (void) tapResponse:(UITapGestureRecognizer *)recognizer
{

UITextView *textView =  (UITextView *)recognizer.view;
CGPoint location = [recognizer locationInView:textView];

CGPoint position = CGPointMake(location.x, location.y);

//get location in text from textposition at point
UITextPosition *tapPosition = [textView closestPositionToPoint:position];

//fetch the word at this position (or nil, if not available)
UITextRange *textRange = [textView.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
NSString *tappedWord = [textView textInRange:textRange];

NSLog(@"tapped word : %@", tappedWord); 

if(tappedWord) {

    if([self.tapDelegate respondsToSelector:@selector(textview:clickedText:)]){
        [self.tapDelegate textview:self clickedText:tappedWord];
    }
 }

}

在你的 TableViewCell 中使用这个自定义类而不是 UITextView，然后在你的

中设置委托

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

并在委托方法中获取结果。

-(void)textview:(UITextView *)clickableTextView clickedText:(NSString *)text {
}

Answer 3

Swift 2.0：

最好使用 UITextView。

1 ) 制作 TapGesture 并添加到 UITextView。 覆盖 func viewDidLoad() { super.viewDidLoad()

    let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "tapResponse:")
    tapGesture.numberOfTapsRequired = 1
    sampleTextView.addGestureRecognizer(tapGesture)    
}

2) 添加获取选中单词的方法。

func tapResponse(recognizer: UITapGestureRecognizer) {
        let location: CGPoint = recognizer.locationInView(sampleTextView)
        let position: CGPoint = CGPointMake(location.x, location.y)
        let tapPosition: UITextPosition = sampleTextView.closestPositionToPoint(position)!
        let textRange: UITextRange = sampleTextView.tokenizer.rangeEnclosingPosition(tapPosition, withGranularity: .Word, inDirection: 1)!

        let tappedWord: String = sampleTextView.textInRange(textRange)!
        print("tapped word : %@", tappedWord)
    }