如何在UITextView中附加文本

Question

我有一個隨機屬性和隨機大小的UITextView 。 我需要在UITextView附加一個水印。 但水印需要具有不同的文本屬性和不同的對齊方式。

例：

This is the UITextView with random  properties.

                         This is the watermark.

Answer 1

您需要使用屬性字符串（ NSAttributedString ）而不是字符串（ NSString ）。

UITextView具有text屬性和attributedText屬性。 在您的情況下，在創建屬性字符串后使用attributedText屬性。

Answer 2

嘗試使用屬性字符串：

NSString *textViewText = @"...";
NSString *watermarkText = @"\nThis is the watermark";
NSString *fullText = [textViewText stringByAppendingString:watermarkText];

NSMutableParagraphStyle *watermarkParagraphStyle = [NSMutableParagraphStyle new];
watermarkParagraphStyle.alignment = NSTextAlignmentCenter;

NSMutableAttributedString *fullTextAttributed = [[NSMutableAttributedString alloc] initWithString:fullText];
[fullTextAttributed addAttribute:NSParagraphStyleAttributeName
                           value:watermarkParagraphStyle
                           range:[fullText rangeOfString:watermarkText]];
textView.attributedText = fullTextAttributed;

Answer 3

這是@ skorolkov的Objective-C代碼的翻譯：

let textViewText = "..."
let watermarkText = "\nThis is the watermark"
let fullText = textViewText + watermarkText

let watermarkParagraphStyle = NSMutableParagraphStyle()
watermarkParagraphStyle.alignment = NSCenterTextAlignment

let fullTextAttributed = NSMutableAttributedString(string: fullText)
fullTextAttributed.addAttribute(NSParagraphStyleAttributeName,
                         value: watermarkParagraphStyle,
                         range: fullText.rangeOfString(waterMarkText))
textView.attributedText = fullTextAttributed