前言
开发中某些情况下，会遇到一些特殊要求，比如需要将一段文本按照固定宽度分割成字符串数组，这里提供一段使用核心文本切割字符串的方法。
Swift代码
import UIKitextension String { ///根据字体和宽度切割字符串 func separatedLines(with font: UIFont, width: CGFloat) -> [String] { let attributedString = NSMutableAttributedString(string: self) attributedString.addAttribute(NSAttributedString.Key(kCTFontAttributeName as String), value: CTFontCreateWithName((font.fontName) as CFString, font.pointSize, nil), range: NSRange(location: 0, length: attributedString.length)) let frameSetter = CTFramesetterCreateWithAttributedString(attributedString) let path = CGMutablePath() path.addRect(CGRect(x: 0, y: 0, width: width, height: 100000), transform: .identity) let frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, nil) let lines = CTFrameGetLines(frame) var linesArray: [String] = [] for line in (lines as Array) { let lineRef = line as! CTLine let lineRange: CFRange = CTLineGetStringRange(lineRef) let range = NSRange(location: lineRange.location, length: lineRange.length) let lineString = (self as NSString).substring(with: range) linesArray.append(lineString) } return linesArray }}复制代码 OC代码
#import#import "NSString+Separated.h"#import @implementation NSString (Separated)/** 根据字体和每一行宽度切割字符串 @param font 字体 @param width 宽度 @return 切割后字符串数组 */- (NSArray *)separatedLinesWithFont:(UIFont *)font width:(CGFloat)width { NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self]; [attributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)CTFontCreateWithName((__bridge CFStringRef)([font fontName]), [font pointSize], NULL) range:NSMakeRange(0, attributedString.length)]; CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attributedString); CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, NULL, CGRectMake(0, 0, width, 100000)); CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL); NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame); NSMutableArray *linesArray = [[NSMutableArray alloc]init]; for (id line in lines) { CTLineRef lineRef = (__bridge CTLineRef )line; CFRange lineRange = CTLineGetStringRange(lineRef); NSRange range = NSMakeRange(lineRange.location, lineRange.length); NSString *lineString = [self substringWithRange:range]; [linesArray addObject:lineString]; } return (NSArray *)linesArray;}@end复制代码