NSMutableString

NSMutableString
生成

NSMutableString *mStr1 = [NSMutableString stringWithString:@"あいうえお"];
NSMutableString *mStr2 = [NSMutableString stringWithCString:"かきくけこ" encoding:NSUTF8StringEncoding];
NSMutableString *mStr3 = [NSMutableString stringWithFormat:@"%@ と %@", mStr1, mStr2];

入替え

[mStr setString:@"ABCDE"];

追加

[mStr appendString:@"あいうえお"];
[mStr appendFormat:@" に %@", @"かきくけこ"];

挿入

[mStr insertString:@"挿入" atIndex:15];

置換

[mStr replaceCharactersInRange:NSMakeRange(3, 1) withString:@"置換"];

削除

[mStr deleteCharactersInRange:NSMakeRange(1, 3)];