1 以C字符串构建OC字符串
NSMutableString * str1 = [NSMutableString stringWithUTF8String:"hello world"];
NSLog(@"str1 = %@",str1);
2 可变字符串构造字符串一般形式
NSMutableString *str2 = [NSMutableString stringWithString:str1];
NSLog(@"str2 = %@",str2);
NSMutableString *str3 = [NSMutableString stringWithFormat:@"%d###%s",1,"asdf"];
NSLog(@"str3 = %@",str3);
3 以可变容量申请创建字符串
NSMutableString *str4 = [NSMutableString stringWithCapacity:20];
//以内容容量大小申请创建可变字符串 以后改变
4 删除
[str2 deleteCharactersInRange:NSMakeRange(2, 2)];
//[对象 方法] 执行结束之后自动返回给对象
NSLog(@"str2 = %@",str2);
5 追加
追加字符串
[str2 appendString:str1];
NSLog(@"str2 = %@",str2);
格式化追加
[str2 appendFormat:@"%d###%.1f",1,1.5];
NSLog(@"str2 = %@",str2);
6 插入
[str1 insertString:@"插入" atIndex:0];
NSLog(@"str1 = %@",str1);
7 重置字符串 修改
[str2 setString:@"hello world"];
NSLog(@"str2 = %@",str2);
8 字符串替换
NSMutableString *str5 = [NSMutableString stringWithString:@"nanjing boweifeng nanjing"];
//1 出现的字符串 2 使用替换的 3附加条件 4 范围
[str5 replaceOccurrencesOfString:@"jing" withString:@"替换" options:NSLiteralSearch range:NSMakeRange(0, 10)];
NSLog(@"str5 = %@",str5);
//用字符串 替换某个范围
[str5 replaceCharactersInRange:NSMakeRange(0, 3) withString:@"范围"];
NSLog(@"str5 = %@",str5);
