Justified text with UITextView and NSMutableAttributedString

问题

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];

I have tried this:

[self.text_view setTextAlignment:NSTextAlignmentJustified]

and this:

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

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

回答1:

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

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

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;

来源：https://stackoverflow.com/questions/23430475/justified-text-with-uitextview-and-nsmutableattributedstring

标签

ios

objective-c

uitextview

nsattributedstring

nsmutableattributedstring