как установить поля на NSAttributedText при преобразовании из RTF

Question

Я преобразовать некоторые RTF текст в NSAttributedString с помощью этого кода (Xamarin C#, но та же логика применима и к Swift/Obj-C)

NSData data = NSData.FromString(RTFString); 
NSDictionary opt = NSDictionary.FromObjectAndKey(NSObject.FromObject("NSDocumentTypeDocumentAttribute"), NSObject.FromObject(NSDocumentType.RTF)); 
NSDictionary docatt = null; 
NSError error = null; 
NSAttributedString sRTF = new NSAttributedString(data, opt, out docatt, ref error); 

это отлично работает, но при преобразовании текста RTF он, похоже, устанавливает значение по умолчанию для правого поля, так что текст не течет по всей ширине UILabel. В исходном тексте RTF нет значения маржи.

Как изменить или установить значение поправочного значения полученного атрибута, чтобы оно перетекало по всей ширине моей метки?

Образец RTF

sample.rtf

{\\rtf1\\ansi\\ansicpg1252\\uc1\\htmautsp\\deff2{\\fonttbl{\\f0\\fcharset0 Times New Roman;}{\\f2\\fcharset0 Segoe UI;}}{\\colortbl\\red0\\green0\\blue0;\\red255\\green255\\blue255;\\red255\\green165\\blue0;}\\loch\\hich\\dbch\\pard\\plain\\ltrpar\\itap0{\\lang1033\\fs26\\f2\\cf0 \\cf0\\ql{\\f2 {\\b\\fs30\\cf2\\ltrch 1. Gum/Lip Irritation: }{\\fs24\\ltrch Whitening gel that comes into contact with gum tissue or the lips can become inflammed or bleached. The inflammation or whitening effect is temporary. You may feel a stinging and/or tingling sensation on these soft tissues during the treatment.2. Tooth Sensitivity: You may experience some tooth sensitivity during the first 24 hours after your treatment. Underlying tooth/gum disease such as existing sensitivity, cracked teeth, open cavities, leaking fillings, exposed roots or other dental conditions may worsen or prolong tooth sensitivity after treatment.3. Spots or Streaks: There is a potential to develop white spots or streaks on your teeth due to calcium deposits that naturally occur in teeth. These spots are not caused by Beaming White gel. The gel just brings these calcium deposits out and makes them more visible. This effect will fade over time.4. Relapse: After your treatment, it is natural for teeth color to regress over time. This relapse can be slowed down by avoiding staining agents such as coffee, tea, tobacco, red wine, colas etc. It is very important to avoid these staining agents, especially during the first 24 hours after treatment. I understand that the results of my treatment are not permanent, that up to 3 applications may be needed for desired effect and maintanence treatment every recommended very 4-6 months.}\\li0\\ri0\\sa0\\sb0\\fi0\\ql\\par}\r\n}\r\n} 

Answer 1

Вставьте крайний правый край (\margrXXXX), или один из только 0должен также работать, но не всегда (?), для переопределения поля по умолчанию вашей строки rtf, чтобы можно было использовать всю ширину вашего UILabel.Frame для точки абзаца абзаца.

До:

После:

{\rtf1\ansi\ansicpg1252\uc1\htmautsp\margr20000\deff2{\fo...‌​