oc 字符串 数组 简单使用

//    NSString不可变的字符串的类
    
//    初始化
    NSString *str1 = @"字面量";//字面量 （语法糖），⚠️ 不可变
    NSString *str2 = [[NSString alloc]initWithFormat:@"initWithFormat: %d",33];
    NSLog(@"%@",str1);
    NSLog(@"%@",str2);
    
//    便利构造器
    NSString *str3 = [NSString stringWithFormat:@" 便利构造器: %d",23];
    NSLog(@"%@",str3);

//    获取字符串长度
//    NSString *str4 = @"abcde";
    NSString *str4 = [[NSString alloc]initWithFormat:@"蓝鸥科技 公司"];
    NSLog(@"%lu", (unsigned long)[str4 length]);
    
//    判断字符串是否以指定字符串开始或结束
    BOOL a = [str4 hasPrefix:@"s"];//前缀
    NSLog(@"%d",a);
    NSLog(@"%d", [str4 hasSuffix:@"sd"]);//后缀
    
//    字符串截取
    NSLog(@"%@",[str4 substringFromIndex:2]);//从第几个开始截取字符串到结束 包括当前下标
    NSLog(@"%@",[str4 substringToIndex:2]);//从0下标开始截取字符串到当前下标 ⚠️不包括当前下标
//    实例化NSRage 变量 然后再执行 substringWithRange
//     获取一个字符串中 字符的rang：
     NSRange rang = [str4 rangeOfString:@"蓝鸥"];
     
    NSRange range = NSMakeRange(2, 2);
    NSLog(@"%@",[str4 substringWithRange:range]);
    
//    字符串拼接
    NSString *s = [str4 stringByAppendingString:@"3G"];
    NSLog(@"%@",s);
    NSString *ns = [str4 stringByAppendingFormat:@"  %@  ggg",str1];
    NSLog(@"%@",ns);
    
//    字符串比较
    NSString *cmp1 = @"ab";
    NSString *cmp2 = @"as";
    NSLog(@"%ld", [cmp1 compare:cmp2]);
    if (NSOrderedAscending == [cmp1 compare:cmp2]) {
        NSLog(@"后一个大");
    }else if (NSOrderedDescending ==[cmp1 compare:cmp2]){
         NSLog(@"前一个大");
    }else if (NSOrderedSame ==[cmp1 compare:cmp2]){
        NSLog(@"相等");
    }
    
    NSLog(@"----%d", [cmp1 isEqualToString:cmp2]);//只能比是否相等 不等返回0 相等返回1
    
    
//    字符串替换
//    [str4 stringByReplacingCharactersInRange:<#(NSRange)#> withString:<#(NSString *)#>]
    NSLog(@"%@", [ns stringByReplacingOccurrencesOfString:@"ggg" withString:@"6666"]);
    
//    字符串大小写转换
    NSString *str5 =@"avcF";
    NSLog(@"%@", [str5 uppercaseString]);//全部转换为大写
//    NSLog(@"%@", [str5 uppercaseStringWithLocale:<#(NSLocale *)#>])
    
    NSLog(@"%@", [str5 lowercaseString]);//全部转换为小写
    
    NSLog(@"%@", [str5 capitalizedString]);//首字母大写 其余的都小写
    
//    字符串和数值类型的转换
//    数值类型转换为字符串
    NSString *valueStr = [NSString stringWithFormat:@"%d",555];
    NSLog(@"字符串类型：%@",valueStr);
//    字符串转换为数值类型
    NSLog(@"数值类型：%d", [valueStr intValue]);
    
    
    
//    NSMutableString 可变的字符串
     
     
    NSMutableString *mutableStr1 = [[NSMutableString alloc]initWithFormat:@"avhj"];
    NSMutableString *mutableStr2 = [NSMutableString stringWithFormat:@"dsda"];
    
//   拼接字符串
    [mutableStr1 stringByAppendingString:@"dsa"];//使用父类NSString的字符串拼接方法 需要字符串接收
    
    [mutableStr1 appendFormat:@"--s--%@",mutableStr2];//直接拼接到自身
    NSLog(@"%@",mutableStr1);
    
//    插入字符串
    
    NSMutableString *mutableStr3 = [NSMutableString stringWithFormat:@"sdsd"];
    [mutableStr3 insertString:@"--www--" atIndex:1];//在 atIndex 这个位置前面查入
    NSLog(@"%@",mutableStr3);
    
    
//    删除字符串
    NSMutableString *mutableStr4 = [NSMutableString stringWithFormat:@"稻草人"];
    NSRange range1 = NSMakeRange(0, 2);
    [mutableStr4 deleteCharactersInRange:range1];//从开始索引 删除 到 后一个索引之前的
    NSLog(@"%@",mutableStr4);
    
    */
    
    /*
    NSString *ns= [NSString stringWithFormat:@"sda.png"];
    if ([ns hasSuffix:@"png"]) {
         ns = [ns stringByReplacingOccurrencesOfString:@"png" withString:@"jpg"];
    } else{
        ns = [ns stringByAppendingFormat:@".jpg"];
    }
    NSLog(@"%@",ns);
    
    
    NSMutableString *ns1= [NSMutableString stringWithFormat:@"sda.png"];
    NSRange rang = [ns1 rangeOfString:@"png"];
    if ([ns1 hasSuffix:@"png"]) {
         [ns1 replaceCharactersInRange:rang withString:@"jpg"];
    } else{
        [ns1 stringByAppendingFormat:@".jpg"];
    }
    NSLog(@"%@",ns1);
    */
    
//    NSArray 常用的方法
    /*
     不可变数组 ：有序 ，下标从 0 开始；
     注意：数组存储的只能是对象类型，不能是数值类型
     */
    /*
//    初始化方法
    NSArray *arr1 = @[@"obj1" ,@"obj2", @"obj3"];//字面量
    NSArray *arr2 = [[NSArray alloc]initWithArray:arr1];
    NSArray *arr3 = [[NSArray alloc]initWithObjects:@"a",@"s",@"d", nil];
    NSArray *arr4 = [NSArray array];//数组初始化 并没有值
    NSArray *arr5 = [NSArray arrayWithArray:arr3];
    NSArray *arr6 = [NSArray arrayWithObject:@"ds"];
    NSArray *arr7 = [NSArray arrayWithObjects:@"22",@"33", nil];
    NSLog(@"%@",arr1);
    NSLog(@"%@",arr2);
    NSLog(@"%@",arr3);
    NSLog(@"%@",arr4);
    NSLog(@"%@",arr5);
    NSLog(@"%@",arr6);
    NSLog(@"%@",arr7);
    
    
//    获取元素个数
    NSLog(@"%lu",[arr1 count]);
    
    
//    根据索引值获取对象
    NSString *a = [arr1 objectAtIndex:2];
    NSLog(@"%@", a);
    
//    获取对象在数组中的索引值
    NSLog(@"%lu", [arr1 indexOfObject:@"obj2"]);
    
    
    
//
//     NSMutableArray
//     可变数组，是NSAray的子类，可以增删改等操作
//     
//     
//    实例化数组对象
    NSMutableArray *mutablearr1 = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3", nil];
    
//    添加元素
    [mutablearr1 addObject:@"4"];
    [mutablearr1 addObjectsFromArray:@[@"22",@"33"]];
    NSLog(@"%@",mutablearr1);
    
//    插入元素
    [mutablearr1 insertObject:@"ss" atIndex:1];
    NSLog(@"%@",mutablearr1);
//    删除元素
    [mutablearr1 removeObjectAtIndex:1];
    [mutablearr1 removeObjectsInArray:@[@"2",@"3"]];
    NSLog(@"%@",mutablearr1);
//    替换元素
    [mutablearr1 replaceObjectAtIndex:1 withObject:@"aa"];
    NSLog(@"%@",mutablearr1);
    
//    交换指定位置的两个元素
    [mutablearr1 exchangeObjectAtIndex:1 withObjectAtIndex:2];
    NSLog(@"%@",mutablearr1);
    
//    数组遍历
    for (int i = 0; i <[mutablearr1 count]; i++) {
        NSLog(@"%@",mutablearr1[i]);//字面量的形式访问数组元素
        NSLog(@"%@",[mutablearr1 objectAtIndex:i]);
    }
    for (NSString *obj in mutablearr1) {
        NSLog(@"%@",obj);
    }
    
    */
    
    /*
    
    NSMutableArray *name = [NSMutableArray arrayWithObjects:@"a",@"b",@"c",@"d", nil];
    NSMutableArray *price = [NSMutableArray arrayWithObjects:@"77",@"55",@"32",@"42", nil];
    
    [name addObject:@"q"];
    [price addObject:@"92"];
//    for (NSString* obj in name) {
//        NSLog(@"%@",obj);
//    }
//    for (NSString* obj in price) {
//        NSLog(@"%@",obj);
//    }
//    for (int i = 0; i < [name count]; i++) {
//        NSLog(@"%@---%@",[name objectAtIndex:i],[price objectAtIndex:i]);
//    }
    
    [price removeObjectAtIndex:[name indexOfObject:@"c"]];
    [name removeObject:@"c"];
//    for (int i = 0; i < [name count]; i++) {
//        NSLog(@"%@---%@",[name objectAtIndex:i],[price objectAtIndex:i]);
//    }
    
    [price replaceObjectAtIndex:[name indexOfObject:@"q"] withObject:@"99"];
    
    for (int i = 0; i < [name count]; i++) {
        NSLog(@"%@---%@",[name objectAtIndex:i],[price objectAtIndex:i]);
    }
    */
    
//       NSNumber
    NSNumber *nm = [NSNumber numberWithInt:3];
    NSLog(@"%@",nm);
    
    NSLog(@"%d", [nm intValue]);
    
    NSRange range = NSMakeRange(2, 3);
    NSValue *nv = [NSValue valueWithRange:range];
//    NSRange r = [nv rangeValue];
    NSLog(@"%@",nv);