使用 UITextView 和 NSMutableAttributedString 对齐的文本

问题描述

我正在尝试使用 NSMutableAttributedString 为 UITextView 放置一个对齐的文本，NSMutableAttributedString 由不同的 NSAttributedString 因为我需要粗体和普通字体，所以我附加了不同的NSString，这是我的NSMutableAttributedString:

I'm trying to put a justified text for a UITextView with NSMutableAttributedString, the NSMutableAttributedString is composed of different NSAttributedString because I need bold and regular font, so I append different NSString, this is my NSMutableAttributedString:

NSAttributedString *one = [[NSAttributedString alloc] initWithString:@"abc"
                                                          attributes:boldDict];
NSAttributedString *two = [[NSAttributedString alloc] initWithString:@" def"
                                                          attributes:regularDict];
NSAttributedString *three = [[NSAttributedString alloc] initWithString:@" ghi"
                                                            attributes:boldDict];

NSMutableAttributedString *string =
 [[NSMutableAttributedString alloc] initWithAttributedString:one];
[string appendAttributedString:two];
[string appendAttributedString:three];

我已经试过了:

[self.text_view setTextAlignment:NSTextAlignmentJustified]

还有这个:

NSMutableParagraphStyle *paragraphStyles = [[NSMutableParagraphStyle alloc] init];
paragraphStyles.alignment = NSTextAlignmentJustified;
Dictionary *attributes = @{NSParagraphStyleAttributeName: paragraphStyles};

并将其应用于 NSMutableAttributedString，但两者都不起作用.我该怎么办?

and apply this to NSMutableAttributedString, but neither works. how i can do?

推荐答案

我通过为 NSAttributedString 指定透明背景色解决了同样的问题.

I fixed the same problem by specifying transparent background color for the NSAttributedString.

看起来像 UILabel 代码中的一个错误，它应该像 NSString 一样呈现简单的 NSAttributedString.

Looks like a bug in the UILabel code which should render simple NSAttributedString like NSString.

Xamarin.iOS 示例:

Xamarin.iOS example:

var paragraphStyle = new NSMutableParagraphStyle();
paragraphStyle.Alignment = UITextAlignment.Justified;
var attributedText = new NSAttributedString(simpleString,
                         paragraphStyle: paragraphStyle,
                         backgroundColor: Color.Transparent.ToUIColor());
myLabel.AttributedText = attributedText;

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