OC NSMutableString的使用

#pragma mark 可变字符串的创建
void stringCreate() {
    // 预先分配10个字数的存储空间
    NSMutableString *str = [[NSMutableString alloc] initWithCapacity:];
    // 设置字符串内容
    [str setString:@""];

    // 拼接一个字符串
    [str appendString:@""];
    // 拼接字符串
    [str appendFormat:@"age is %i and height is %.2f", , 1.55f];

    // 替换字符串
    NSRange range = [str rangeOfString:@"height"];
    //NSRange range = NSMakeRange(7, 3);
    [str replaceCharactersInRange:range withString:@"no"];

    // 插入字符串
    [str insertString:@"abc" atIndex:];

    // 删除字符串
    range = [str rangeOfString:@"age"];
    [str deleteCharactersInRange:range];

    NSLog(@"%@", str);

    // 释放对象
    [str release];
}

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        stringCreate();
    }
    return ;
}