在UITextView中使超链接可点击是很简单的。您只需在IB中的视图上设置“检测链接”复选框，它就会检测HTTP链接并将其转换为超链接。
然而，这仍然意味着用户看到的是“原始”链接。RTF文件和HTML都允许你设置一个用户可读的字符串，“后面”有一个链接。
将带属性的文本安装到文本视图(或UILabel或UITextField)是很容易的。但是，当带有属性的文本包含链接时，它是不可点击的。
是否有一种方法使用户可读的文本点击在UITextView, UILabel或UITextField?
在SO上的标记是不同的，但这里是大致的思想。我想要的是这样的文本:
这个变形是由Face Dancer生成的，点击在应用程序商店中查看。
我唯一能得到的是:
这个变形是由Face Dancer生成的，点击http://example.com/facedancer在应用商店中查看。
当前回答
如果你有@Karl Nosworthy和@esilver上面提供的问题，我已经更新了NSMutableAttributedString扩展到它的Swift 4版本。
extension NSMutableAttributedString {
public func setAsLink(textToFind:String, linkURL:String) -> Bool {
let foundRange = self.mutableString.range(of: textToFind)
if foundRange.location != NSNotFound {
_ = NSMutableAttributedString(string: textToFind)
// Set Attribuets for Color, HyperLink and Font Size
let attributes = [NSFontAttributeName: UIFont.bodyFont(.regular, shouldResize: true), NSLinkAttributeName:NSURL(string: linkURL)!, NSForegroundColorAttributeName: UIColor.blue]
self.setAttributes(attributes, range: foundRange)
return true
}
return false
}
}
其他回答
如果你想在UITextView中使用NSLinkAttributeName，那么你可以考虑使用AttributedTextView库。它是一个UITextView子类，它让处理这些变得很容易。更多信息请参见:https://github.com/evermeer/AttributedTextView
你可以让文本的任何部分像这样交互(其中textView1是一个UITextView IBoutlet):
textView1.attributer =
"1. ".red
.append("This is the first test. ").green
.append("Click on ").black
.append("evict.nl").makeInteract { _ in
UIApplication.shared.open(URL(string: "http://evict.nl")!, options: [:], completionHandler: { completed in })
}.underline
.append(" for testing links. ").black
.append("Next test").underline.makeInteract { _ in
print("NEXT")
}
.all.font(UIFont(name: "SourceSansPro-Regular", size: 16))
.setLinkColor(UIColor.purple)
为了处理标签和提及，你可以使用这样的代码:
textView1.attributer = "@test: What #hashtags do we have in @evermeer #AtributedTextView library"
.matchHashtags.underline
.matchMentions
.makeInteract { link in
UIApplication.shared.open(URL(string: "https://twitter.com\(link.replacingOccurrences(of: "@", with: ""))")!, options: [:], completionHandler: { completed in })
}
我发现这真的很有用，但我需要在相当多的地方这样做，所以我已经包装了我的方法在一个简单的扩展到NSMutableAttributedString:
斯威夫特3
extension NSMutableAttributedString {
public func setAsLink(textToFind:String, linkURL:String) -> Bool {
let foundRange = self.mutableString.range(of: textToFind)
if foundRange.location != NSNotFound {
self.addAttribute(.link, value: linkURL, range: foundRange)
return true
}
return false
}
}
斯威夫特2
import Foundation
extension NSMutableAttributedString {
public func setAsLink(textToFind:String, linkURL:String) -> Bool {
let foundRange = self.mutableString.rangeOfString(textToFind)
if foundRange.location != NSNotFound {
self.addAttribute(NSLinkAttributeName, value: linkURL, range: foundRange)
return true
}
return false
}
}
使用示例:
let attributedString = NSMutableAttributedString(string:"I love stackoverflow!")
let linkWasSet = attributedString.setAsLink("stackoverflow", linkURL: "http://stackoverflow.com")
if linkWasSet {
// adjust more attributedString properties
}
objective - c
我只是满足了在纯Objective-C项目中做同样事情的要求，这里是Objective-C类别。
@interface NSMutableAttributedString (SetAsLinkSupport)
- (BOOL)setAsLink:(NSString*)textToFind linkURL:(NSString*)linkURL;
@end
@implementation NSMutableAttributedString (SetAsLinkSupport)
- (BOOL)setAsLink:(NSString*)textToFind linkURL:(NSString*)linkURL {
NSRange foundRange = [self.mutableString rangeOfString:textToFind];
if (foundRange.location != NSNotFound) {
[self addAttribute:NSLinkAttributeName value:linkURL range:foundRange];
return YES;
}
return NO;
}
@end
使用示例:
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:"I love stackoverflow!"];
BOOL linkWasSet = [attributedString setAsLink:@"stackoverflow" linkURL:@"http://stackoverflow.com"];
if (linkWasSet) {
// adjust more attributedString properties
}
确保NSTextField的Behavior属性被设置为Selectable。
我需要继续使用一个纯的UILabel，所以从我的点击识别器称为这(这是基于malex的响应在这里:字符索引在触摸点UILabel)
UILabel* label = (UILabel*)gesture.view;
CGPoint tapLocation = [gesture locationInView:label];
// create attributed string with paragraph style from label
NSMutableAttributedString* attr = [label.attributedText mutableCopy];
NSMutableParagraphStyle* paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.alignment = label.textAlignment;
[attr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, label.attributedText.length)];
// init text storage
NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:attr];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[textStorage addLayoutManager:layoutManager];
// init text container
NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeMake(label.frame.size.width, label.frame.size.height+100) ];
textContainer.lineFragmentPadding = 0;
textContainer.maximumNumberOfLines = label.numberOfLines;
textContainer.lineBreakMode = label.lineBreakMode;
[layoutManager addTextContainer:textContainer];
// find tapped character
NSUInteger characterIndex = [layoutManager characterIndexForPoint:tapLocation
inTextContainer:textContainer
fractionOfDistanceBetweenInsertionPoints:NULL];
// process link at tapped character
[attr enumerateAttributesInRange:NSMakeRange(characterIndex, 1)
options:0
usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {
if (attrs[NSLinkAttributeName]) {
NSString* urlString = attrs[NSLinkAttributeName];
NSURL* url = [NSURL URLWithString:urlString];
[[UIApplication sharedApplication] openURL:url];
}
}];
我写了一个方法，添加一个链接(linkString)到一个字符串(fullString)与特定的url(urlString):
- (NSAttributedString *)linkedStringFromFullString:(NSString *)fullString withLinkString:(NSString *)linkString andUrlString:(NSString *)urlString
{
NSRange range = [fullString rangeOfString:linkString options:NSLiteralSearch];
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:fullString];
NSMutableParagraphStyle *paragraphStyle = NSMutableParagraphStyle.new;
paragraphStyle.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = @{NSForegroundColorAttributeName:RGB(0x999999),
NSFontAttributeName:[UIFont fontWithName:@"HelveticaNeue-Light" size:10],
NSParagraphStyleAttributeName:paragraphStyle};
[str addAttributes:attributes range:NSMakeRange(0, [str length])];
[str addAttribute: NSLinkAttributeName value:urlString range:range];
return str;
}
你应该这样称呼它:
NSString *fullString = @"A man who bought the Google.com domain name for $12 and owned it for about a minute has been rewarded by Google for uncovering the flaw.";
NSString *linkString = @"Google.com";
NSString *urlString = @"http://www.google.com";
_youTextView.attributedText = [self linkedStringFromFullString:fullString withLinkString:linkString andUrlString:urlString];
如果你想在你的UITextView活动子字符串，那么你可以使用我的扩展TextView…它简短而简单。你可以随意编辑。
结果:
代码: https://github.com/marekmand/ActiveSubstringTextView
