Swift
let sampleText = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
// Create label
let label = UILabel(frame: CGRectMake(0, 0, view.frame.size.width, 400))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.ByWordWrapping
// Justify text through paragraph style
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.Justified
let attributes = [NSParagraphStyleAttributeName: paragraphStyle, NSBaselineOffsetAttributeName: NSNumber(float: 0)]
let attributedString = NSAttributedString(string: sampleText, attributes: attributes)
label.attributedText = attributedString
view.addSubview(label)Objective-C
NSString *sampleText = @"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
// Create label
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 400)];
label.numberOfLines = 0;
label.lineBreakMode = NSLineBreakByWordWrapping;
// Justify text through paragraph style
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentJustified;
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:sampleText attributes:@{
NSParagraphStyleAttributeName : paragraphStyle,
NSBaselineOffsetAttributeName : [NSNumber numberWithFloat:0]
}];
label.attributedText = attributedString;
[self.view addSubview:label];