NSString //字符串 NSInteger //长整形(64位下) CGFloat //实型
NSStringAndNSMutableString 字符串对象
NSArrayAndNSmutableArray 数组
NSNumber 数值对象类 (区别于NSInteger 基本数据类型)
NSValue 结构体
NSDictionaryAndNSMutableDictionary 字典型数据
NSSetAndNSMutableSet 集合
1)NSStringAndNSMutableString
创建字符串对象
initWithString 相当于直接赋值常量字符串对象
NSString *str1 = @"张三";
//stringWithString :相当于直接赋值
NSString*str2 = @"李四"; //
NSString *str2 =[NSString stringWithString:@""]
initWithFormat :通过传入格式化字符串进行字符串对象的创建
NSString *str3 = [[NSString alloc]initWithFormat:@"常量字符串 %@ %d %f",@"iPhone",6,6089.00];
NSLog(@"%@",str3);
//stringWithFormat : 其实内部封装了 alloc 以及 initWithFormat :操作
NSString *str4 = [NSString stringWithFormat:@"通过便利构造器创建字符串"];
NSLog(@"%@",str4);
//initWithUTF8String : 将C语言的字符串 转化成 OC 字符串对象
NSString *str5 = [[NSString alloc]initWithUTF8String:"我是一个C语言字符串,不加@"];
NSLog(@"%@",str5);
//
NSString *str6 = [NSString stringWithUTF8String:"哔了狗了,通过便利构造器的方法将C语言转化为OC字符串"];
NSLog(@"%@",str6);
NSString *str =[NSString stringWithFormat:@"http://www.baidu.com"];
NSLog(@"%@",str);
//1.替换 将所有符合条件的字符串进行替换
NSString *replaceStr =[str stringByReplacingOccurrencesOfString:@"baidu" withString:@"lanxiang"];
NSLog(@"%@",replaceStr);
//2.拼接
NSString *appendStr = [str stringByAppendingFormat:@".cn"];
NSLog(@"%@",appendStr);
//3.长度
NSUInteger length = [str length];
NSLog(@"length = %lu",length);
//4 大小写转换
NSString *upperStr = [str uppercaseString];
NSLog(@"%@",upperStr);
NSString *lowerStr = [upperStr lowercaseString];
NSLog(@"%@",lowerStr);
//首字母大写
NSString *capital = [str capitalizedString];
NSLog(@"%@",capital);
//5.判断开头结尾 一般用来判断字符串的格式
BOOL isPerFix = [str hasPrefix:@"ftp"];
NSLog(@"%d",isPerFix);
BOOL isSufFix = [str hasSuffix:@".com"];
NSLog(@"%d",isSufFix);
6.字符串截取
substringFromIndex : 从给定位置开始截取大字符串结束(包括当前位置)
substringToIndex : 从开头截取到指定位置 (不包括当前位置)
substringWithRange : 通过给定范围进行字符串的截取
系统给我们提供了 快速创建结构体的方式 NSMake + 结构体名 (例如 NSRange NSMakeRange(1,10);)
NSString *subStr1 = [str substringFromIndex:3];
NSLog(@"%@",subStr1);
NSString *subStr2 = [str substringToIndex:3];
NSLog(@"%@",subStr2);
NSString *subStr3 = [str substringWithRange:NSMakeRange(11, 7)];
NSLog(@"%@",subStr3);
判断相等
NSString *str2 = [NSString stringWithFormat:@"aa"];
NSString *str3 = [NSString stringWithFormat:@"aa"];
BOOL isEqual =[str2 isEqualToString:str3];
NSLog(@"%d",isEqual);
//比较
NSInteger result = [str2 compare:str3];
NSLog(@"result = %ld",result);
1.1NSMutableString 可变字符串 是NSString的子类 增添了NSString 的可变的功能
NSMutableString *xiaoMing = [[NSMutableString alloc ]initWithFormat:@"xiaoMing love wifi"];
//增
//拼接
[xiaoMing appendFormat:@" xiaoHong"];
NSLog(@"%@",xiaoMing);
//插入
[xiaoMing insertString:@"and " atIndex:17];
NSLog(@"%@",xiaoMing);
//可变子类不要轻易调用父类不可变的方法
//删
//删除
[xiaoMing deleteCharactersInRange:NSMakeRange(12, 8)];
NSLog(@"%@",xiaoMing);
//替换
[xiaoMing replaceCharactersInRange:NSMakeRange(12, 10)withString:@"wifi"];
NSLog(@"%@",xiaoMing);
//改
[xiaoMing setString:@"xiaoMing and xiaoHong live happily forever"];
NSLog(@"%@",xiaoMing);
//判断字符串@"aBcD_EfGK"中是否有EfGk,如果有将EfGK转换成WXYZ,并让字符串的大写字母转成小写,输出修改完成的字符串
NSString *str =@"aBcD_EfGk";
//rangeOfString:查找所给字符串在原字符串中的范围 如果length > 0 说明 存在,如果length == 0 则不存在
NSRange range = [str rangeOfString:@"EfGk"];
NSLog(@"%ld %ld",range.location,range.length);
if (range.length > 0) {
NSString *newStr = [str stringByReplacingOccurrencesOfString:@"EfGk" withString:@"WXYZ"];
//转化为小写
NSString *lowerStr = [newStr lowercaseString];
NSLog(@"%@",lowerStr);
}
2)NSArrayAndNSmutableArray
2.1NSArray
NSString *Nokia = @"Nokia";
NSString *apple = @"Apple";
NSString *mi = @"MI";
//initWithObjects:在初始化时 一次性存入多个对象 对象和对象之间","隔开 以"nil"结尾 ,nil 之后的对象不再存储
NSArray *array = [[NSArray alloc]initWithObjects:Nokia,apple,mi, Nokia,nil];
NSLog(@"%@",array);
//数组个数
NSInteger count = [array count];
NSLog(@"count = %ld",count);
//访问数组元素
NSString *what = [array objectAtIndex:3];
NSLog(@"%@ %@",what,array[2]);
//通过对象 找到索引值
//indexOfObject: 只是 找到第一个满足条件的对象的下标
NSInteger index = [array indexOfObject:Nokia];
NSLog(@"%ld",index);
//遍历数组
for (int i = 0; i < array.count; i++)
{
NSLog(@"%@",[array objectAtIndex:i]);
}
NSArray *sortedArray = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"%@",sortedArray);
2.1NSMutableArray
NSString *xiaoYi = [NSString stringWithFormat:@"xiaoYi
