Swift - 计算文本高度

概述http://www.cnblogs.com/YouXianMing/p/5823893.html //// String+StringHeight.swift// StringHeight//// Created by YouXianMing on 16/8/30.// Copyright © 2016年 YouXianMing. All rights reserved.//

http://www.cnblogs.com/YouXianMing/p/5823893.HTML

////  String+StringHeight.swift//  StringHeight////  Created by YouXianMing on 16/8/30.//  copyright © 2016年 YouXianMing. All rights reserved.//import UIKitextension String {        /**     Get the height with the string.          - parameter attributes: The string attributes.     - parameter fixeDWIDth: The fixed wIDth.          - returns: The height.     */    func heightWithStringAttributes(attributes : [String : AnyObject],fixeDWIDth : CGfloat) -> CGfloat {                guard self.characters.count > 0 && fixeDWIDth > 0 else {                    return 0        }                let size = CGSizeMake(fixeDWIDth,CGfloat.max)        let text = self as Nsstring        let rect = text.boundingRectWithSize(size,options:.UseslineFragmentOrigin,attributes: attributes,context:nil)                return rect.size.height    }        /**     Get the height with Font.          - parameter Font:       The Font.     - parameter fixeDWIDth: The fixed wIDth.          - returns: The height.     */    func heightWithFont(Font : UIFont = UIFont.systemFontOfSize(18),fixeDWIDth : CGfloat) -> CGfloat {                guard self.characters.count > 0 && fixeDWIDth > 0 else {                        return 0        }                let size = CGSizeMake(fixeDWIDth,attributes: [NSFontAttributename : Font],context:nil)                return rect.size.height    }        /**     Get the wIDth with the string.          - parameter attributes: The string attributes.          - returns: The wIDth.     */    func wIDthWithStringAttributes(attributes : [String : AnyObject]) -> CGfloat {                guard self.characters.count > 0 else {                        return 0        }                let size = CGSizeMake(CGfloat.max,0)        let text = self as Nsstring        let rect = text.boundingRectWithSize(size,context:nil)                return rect.size.wIDth    }        /**     Get the wIDth with the string.          - parameter Font: The Font.          - returns: The string's wIDth.     */    func wIDthWithFont(Font : UIFont = UIFont.systemFontOfSize(18)) -> CGfloat {                guard self.characters.count > 0 else {                        return 0        }                let size = CGSizeMake(CGfloat.max,context:nil)                return rect.size.wIDth    }}

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