iOS修改字间距
var paragraphStyle =NSParagraphStyle.defaultParagraphStyle().mutableCopy() as NSMutableParagraphStyle
paragraphStyle.lineSpacing = 4.0
var attributes = [NSParagraphStyleAttributeName: paragraphStyle]
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var paragraphStyle =NSParagraphStyle.defaultParagraphStyle().mutableCopy() as NSMutableParagraphStyle
paragraphStyle.lineSpacing = 4.0
var attributes = [NSParagraphStyleAttributeName: paragraphStyle]