NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
style.alignment = NSTextAlignmentJustified;
style.firstLineHeadIndent = 10.0f;
style.headIndent = 10.0f;
style.tailIndent = -10.0f;
NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:@"" attributes:@{ NSParagraphStyleAttributeName : style}];
self.contentLbl.numberOfLines = 0;
self.contentLbl.attributedText = attrText;
iOS給UILabel設置內邊距
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