Swift中计算字符串的宽高

// 计算字符串的宽度，高度

letstring:String ="swift中计算字符串的宽度和高度。swift中计算字符串的宽度和高度。swift中计算字符串的宽度和高度。"

letfont:UIFont! = UIFont(name:"EuphemiaUCAS",size:12.0)

let attributes = [NSFontAttributeName:font]

let option = NSStringDrawingOptions.UsesLineFragmentOrigin

letrect:CGRect = string.boundingRectWithSize(CGSizeMake(320.0,999.9),options: option,attributes: attributes,context:nil)

print("rect:\(rect)")