OC学习之可变字符串NSMutableString

NSMutableString 继承于NSString 所以NSSting的所有方法NSMutableString都继承并且也可以用

下面有两个方法NSString没有的

//长度为0 同样表示空的字符串NSMutableString * str3 = [[NSMutableString alloc] initWithCapacity:0];//类方法的创建形式空的NSMutableString * str4 = [NSMutableString string];//可变字符串的相关方法//重置字符串 str1 = @"dsa";NSMutableString * str1 = [[NSMutableString alloc] initWithString:@"dsa"];// str1 = @"s1s2s3ss";[str1 setString:@"s1s2s3ss"];//格式化的形式追加字符串 str1 = @"s1s2s3ss1";[str1 appendFormat:@"%d",1];//追加一个字符串 str1 = @"s1s2s3ss1asd";[str1 appendString:@"asd"];//删除字符串 range = {3,3};NSRange range = NSMakeRange(3, 3);// str1 = @"s1sss1asd"; 删除的字符串是s2s[str1 deleteCharactersInRange:range];NSLog(@"%@",str1);//插入字符串在下标为3的地方插入,这里对要插入的字符串长度没限制,不会覆盖掉原来后面的字符串[str1 insertString:@"UUUUUU" atIndex:3];NSLog(@"%@",str1); //str1 = @"s1sUUUUUUss1asd";//替换字符串[str1 replaceCharactersInRange:NSMakeRange(3, 7) withString:@"AAAAAAAAAAA"];NSLog(@"%@",str1); //str1 = @"s1sAAAAAAAAAAAs1asd";

几个关于可变字符串的方法小程序/*10.将原字符串进行小写转大写，大写转小写*/NSMutableString * str101 = [[NSMutableString alloc]initWithFormat:@"%@",@"HeHeDa"];NSMutableString * str102 = [[NSMutableString alloc] init];for (int i = 0; i < str101.length; i++) {unichar tempChar = [str101 characterAtIndex:i];if (tempChar >= 65 && tempChar <= 90) {NSMutableString * tempString1 = [[NSMutableString alloc] initWithFormat:@"%c",tempChar];NSString * str103 = [tempString1 lowercaseString];[str102 appendString:str103];}else{NSMutableString * tempString2 = [[NSMutableString alloc] initWithFormat:@"%c",tempChar];NSString * str104 = [tempString2 uppercaseString];[str102 appendString:str104];}}NSLog(@"%@",str102);/*11.对字符串按字母顺序进行排序比如输入@“aczabczab”输出@“aaabbcczz”*/NSMutableString * str111 = [[NSMutableString alloc]initWithFormat:@"%@",@"aczabczab"];for (int i = 0; i < str111.length – 1; i++) {for (int j = i + 1; j < str111.length; j++) {unichar ci = [str111 characterAtIndex:i];unichar cj = [str111 characterAtIndex:j];if (ci > cj) {NSRange iRange = {i,1};NSRange jRange = {j,1};[str111 replaceCharactersInRange:iRange withString:[[NSString alloc] initWithFormat:@"%c",cj]];[str111 replaceCharactersInRange:jRange withString:[[NSString alloc] initWithFormat:@"%c",ci]];}}}NSLog(@"%@",str111);/*12.使用NSLog打印99乘法表*/for (int i = 1; i < 10; i++) {NSMutableString * str121 = [[NSMutableString alloc] init];for (int j = 1; j <= i; j++) {[str121 appendFormat:@"%d*%d=%d\t",j,i,i * j];}NSLog(@"%@",str121);}字符串的方法就是这些，之前老师说过，万物皆字符串，所以字符串以后肯定会常用，本身的方法也不是很多，勤加练习应该没多大问题。

，就算是一辆永久单车也能让你的梦想走很远。

相关文章：

你感兴趣的文章：

标签云：