Swift，swiftcode

Swift，swiftcode

Swift - 計算文本高度

 

效果

 

源碼

////  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, CGFloat.max)        let text = self as NSString        let rect = text.boundingRectWithSize(size, options:.UsesLineFragmentOrigin, 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, options:.UsesLineFragmentOrigin, attributes: attributes, 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, 0)        let text = self as NSString        let rect = text.boundingRectWithSize(size, options:.UsesLineFragmentOrigin, attributes: [NSFontAttributeName : font], context:nil)                return rect.size.width    }}