131 lines
5.0 KiB
Objective-C
131 lines
5.0 KiB
Objective-C
//
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// NSString+MTLimit.m
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// Meet
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//
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// Created by ko1o on 2018/10/22.
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// Copyright © 2018年 ko1o. All rights reserved.
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//
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#import "NSString+MTLimit.h"
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@implementation NSString (MTLimit)
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- (NSInteger)mt_customByteLength
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{
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//拿到所有str的length长度（包括中文英文..都算为1个字符）
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NSUInteger len = self.length;
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//汉字字符集
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// NSString* pattern = @"[\u4e00-\u9fa5]";
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// NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];
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// //计算中文字符的个数
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// NSInteger numMatch = [regex numberOfMatchesInString:self options:NSMatchingReportProgress range:NSMakeRange(0, len)];
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// //计算中文2个字符，英文1个字符
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// return len + numMatch;
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//两个英文字符算1个长度,中文的话默认也是1,emoj表情返回是不固定的长度 2-7
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static NSRegularExpression* regex;
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if (!regex) {
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NSString* pattern = @"[a-zA-Z]";
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regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];
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}
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NSInteger numMatch = [regex numberOfMatchesInString:self options:NSMatchingReportProgress range:NSMakeRange(0, len)];
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return len - (numMatch ) / 2;
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}
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- (NSString *)mt_safeSubStringWithStringLength:(NSInteger)maxLength
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{
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return [self mt_safeSubStringWithByteLength:maxLength isCaculateCustomByteLength:NO];
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}
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- (NSString *)mt_safeSubStringWithByteLength:(NSInteger)maxLength
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{
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return [self mt_safeSubStringWithByteLength:maxLength isCaculateCustomByteLength:YES];
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}
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- (NSString *)mt_safeSubStringWithByteLength:(NSInteger)maxLength isCaculateCustomByteLength:(BOOL)isCaculateCustomByteLength
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{
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NSString * textString = self;
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NSRange fullRange = NSMakeRange(0, [textString length]);
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__block NSMutableString * resultString = [NSMutableString string];
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NSInteger currentLength = isCaculateCustomByteLength ? textString.mt_customByteLength :textString.length;
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if (currentLength > maxLength) {
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[textString enumerateSubstringsInRange:fullRange
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options:NSStringEnumerationByComposedCharacterSequences
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usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop)
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{
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// NSLog(@"%@ %@", substring, NSStringFromRange(substringRange));
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NSMutableString * toString = [resultString mutableCopy];
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[toString appendString:substring];
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NSInteger currentLength = isCaculateCustomByteLength ? toString.mt_customByteLength :toString.length;
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if (currentLength <= maxLength) {
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resultString = toString;
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} else {
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*stop = YES;
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}
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}];
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textString = [resultString copy];
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}
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return textString;
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}
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//判断字符串的字符个数 Unicode编码后是按4个字符算的
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- (NSInteger)mt_unicodeCharacterByteLength
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{
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NSString * tempStr = self;
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int strlength = 0;
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char* p = (char*)[tempStr cStringUsingEncoding:NSUnicodeStringEncoding];
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for (int i=0 ; i<[tempStr lengthOfBytesUsingEncoding:NSUnicodeStringEncoding] ;i++) {
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if (*p) {
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p++;
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strlength++;
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}
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else {
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p++;
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}
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}
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return strlength;
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}
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- (BOOL)mt_stringContainsEmoji
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{
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// 过滤所有表情。returnValue为NO表示不含有表情，YES表示含有表情
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__block BOOL returnValue = NO;
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[self enumerateSubstringsInRange:NSMakeRange(0, [self length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
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const unichar hs = [substring characterAtIndex:0];
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// surrogate pair
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if (0xd800 <= hs && hs <= 0xdbff) {
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if (substring.length > 1) {
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const unichar ls = [substring characterAtIndex:1];
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const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
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if (0x1d000 <= uc && uc <= 0x1f77f) {
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returnValue = YES;
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}
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}
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} else if (substring.length > 1) {
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const unichar ls = [substring characterAtIndex:1];
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if (ls == 0x20e3) {
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returnValue = YES;
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}
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} else {
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// non surrogate
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if (0x2100 <= hs && hs <= 0x27ff) {
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returnValue = YES;
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} else if (0x2B05 <= hs && hs <= 0x2b07) {
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returnValue = YES;
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} else if (0x2934 <= hs && hs <= 0x2935) {
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returnValue = YES;
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} else if (0x3297 <= hs && hs <= 0x3299) {
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returnValue = YES;
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} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
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returnValue = YES;
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}
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}
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}];
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return returnValue;
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}
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@end
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