我希望在包含一些文本的UITextView中绘制一个可自定义的行(使用NSAttributedString)
这是我尝试过的
NSString *unicodeStr = [NSString stringWithFormat:@"%C%C%C",0x00A0,0x0009,0x00A0]; //nbsp,tab,nbsp
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:unicodeStr];
NSRange strRange = NSMakeRange(0,str.length);
NSMutableParagraphStyle *const tabStyle = [[NSMutableParagraphStyle alloc] init];
tabStyle.headIndent = 16; //padding on left and right edges
tabStyle.firstLineHeadIndent = 16;
tabStyle.tailIndent = -16;
NSTextTab *listTab = [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentCenter location:40 options:@{}]; //this is how long I want the line to be
tabStyle.tabStops = @[listTab];
[str addAttribute:NSParagraphStyleAttributeName value:tabStyle range:strRange];
[str addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInt:2] range:strRange];
但无论我为制表位置(本例中为40)和tailIndent(此处为-16)提供的值,该行仅尊重headIndent并跨越整个UITextView宽度(当然减去headIndent).
编辑 – 我很确定问题是因为我没有使用正确的unicode字符(尽管它们似乎是合乎逻辑的选择).如果这给某人一个提示,如果我在第二个之后添加一个空格,即朝向末尾,则标签仅限于一个标签长度
解决方法
这是你的预期结果吗？
你能试试这个：
NSTextTab *listTab = [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentCenter location:self.textView.frame.size.width - tabStyle.firstLineHeadIndent + tabStyle.tailIndent options:@{}];
这是完整的代码：
- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSString *unicodeStr = @"\n\u00a0\t\t\n";
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:unicodeStr];
NSRange strRange = NSMakeRange(0,str.length);
NSMutableParagraphStyle *const tabStyle = [[NSMutableParagraphStyle alloc] init];
tabStyle.headIndent = 16; //padding on left and right edges
tabStyle.firstLineHeadIndent = 16;
tabStyle.tailIndent = -70;
NSTextTab *listTab = [[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentCenter location:self.textView.frame.size.width - tabStyle.headIndent + tabStyle.tailIndent options:@{}]; //this is how long I want the line to be
tabStyle.tabStops = @[listTab];
[str addAttribute:NSParagraphStyleAttributeName value:tabStyle range:strRange];
[str addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInt:2] range:strRange];
NSAttributedString *htmlStr = [[NSAttributedString alloc] initWithData:[@"<h1>Lorem ipsum dolor sit er elit lamet</h1>" dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
[str insertAttributedString:htmlStr atIndex:0];
[str appendAttributedString:htmlStr];
self.textView.attributedText = str;
}
