NSString //字符串 NSInteger //長整形(64位下) CGFloat //實型
NSStringAndNSMutableString 字符串對象
NSArrayAndNSmutableArray 數組
NSNumber 數值對象類 (區別於NSInteger 基本數據類型)
NSValue 結構體
NSDictionaryAndNSMutableDictionary 字典型數據
NSSetAndNSMutableSet 集合
1)NSStringAndNSMutableString
創建字符串對象
initWithString 相當於直接賦值常量字符串對象
NSString *str1 = @"張三";
//stringWithString :相當於直接賦值
NSString*str2 = @"李四"; //
NSString *str2 =[NSString stringWithString:@""]
initWithFormat :通過傳入格式化字符串進行字符串對象的創建
NSString *str3 = [[NSString alloc]initWithFormat:@"常量字符串 %@ %d %f",@"iPhone",6,6089.00];
NSLog(@"%@",str3);
//stringWithFormat : 其實內部封裝了 alloc 以及 initWithFormat :操作
NSString *str4 = [NSString stringWithFormat:@"通過便利構造器創建字符串"];
NSLog(@"%@",str4);
//initWithUTF8String : 將C語言的字符串 轉化成 OC 字符串對象
NSString *str5 = [[NSString alloc]initWithUTF8String:"我是一個C語言字符串,不加@"];
NSLog(@"%@",str5);
//
NSString *str6 = [NSString stringWithUTF8String:"嗶了狗了,通過便利構造器的方法將C語言轉化爲OC字符串"];
NSLog(@"%@",str6);
NSString *str =[NSString stringWithFormat:@"http://www.baidu.com"];
NSLog(@"%@",str);
//1.替換 將所有符合條件的字符串進行替換
NSString *replaceStr =[str stringByReplacingOccurrencesOfString:@"baidu" withString:@"lanxiang"];
NSLog(@"%@",replaceStr);
//2.拼接
NSString *appendStr = [str stringByAppendingFormat:@".cn"];
NSLog(@"%@",appendStr);
//3.長度
NSUInteger length = [str length];
NSLog(@"length = %lu",length);
//4 大小寫轉換
NSString *upperStr = [str uppercaseString];
NSLog(@"%@",upperStr);
NSString *lowerStr = [upperStr lowercaseString];
NSLog(@"%@",lowerStr);
//首字母大寫
NSString *capital = [str capitalizedString];
NSLog(@"%@",capital);
//5.判斷開頭結尾 一般用來判斷字符串的格式
BOOL isPerFix = [str hasPrefix:@"ftp"];
NSLog(@"%d",isPerFix);
BOOL isSufFix = [str hasSuffix:@".com"];
NSLog(@"%d",isSufFix);
6.字符串截取
substringFromIndex : 從給定位置開始截取大字符串結束(包括當前位置)
substringToIndex : 從開頭截取到指定位置 (不包括當前位置)
substringWithRange : 通過給定範圍進行字符串的截取
系統給我們提供了 快速創建結構體的方式 NSMake + 結構體名 (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);
判斷相等
NSString *str2 = [NSString stringWithFormat:@"aa"];
NSString *str3 = [NSString stringWithFormat:@"aa"];
BOOL isEqual =[str2 isEqualToString:str3];
NSLog(@"%d",isEqual);
//比較
NSInteger result = [str2 compare:str3];
NSLog(@"result = %ld",result);
1.1NSMutableString 可變字符串 是NSString的子類 增添了NSString 的可變的功能
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);
//可變子類不要輕易調用父類不可變的方法
//刪
//刪除
[xiaoMing deleteCharactersInRange:NSMakeRange(12, 8)];
NSLog(@"%@",xiaoMing);
//替換
[xiaoMing replaceCharactersInRange:NSMakeRange(12, 10)withString:@"wifi"];
NSLog(@"%@",xiaoMing);
//改
[xiaoMing setString:@"xiaoMing and xiaoHong live happily forever"];
NSLog(@"%@",xiaoMing);
//判斷字符串@"aBcD_EfGK"中是否有EfGk,如果有將EfGK轉換成WXYZ,並讓字符串的大寫字母轉成小寫,輸出修改完成的字符串
NSString *str =@"aBcD_EfGk";
//rangeOfString:查找所給字符串在原字符串中的範圍 如果length > 0 說明 存在,如果length == 0 則不存在
NSRange range = [str rangeOfString:@"EfGk"];
NSLog(@"%ld %ld",range.location,range.length);
if (range.length > 0) {
NSString *newStr = [str stringByReplacingOccurrencesOfString:@"EfGk" withString:@"WXYZ"];
//轉化爲小寫
NSString *lowerStr = [newStr lowercaseString];
NSLog(@"%@",lowerStr);
}
2)NSArrayAndNSmutableArray
2.1NSArray
NSString *Nokia = @"Nokia";
NSString *apple = @"Apple";
NSString *mi = @"MI";
//initWithObjects:在初始化時 一次性存入多個對象 對象和對象之間","隔開 以"nil"結尾 ,nil 之後的對象不再存儲
NSArray *array = [[NSArray alloc]initWithObjects:Nokia,apple,mi, Nokia,nil];
NSLog(@"%@",array);
//數組個數
NSInteger count = [array count];
NSLog(@"count = %ld",count);
//訪問數組元素
NSString *what = [array objectAtIndex:3];
NSLog(@"%@ %@",what,array[2]);
//通過對象 找到索引值
//indexOfObject: 只是 找到第一個滿足條件的對象的下標
NSInteger index = [array indexOfObject:Nokia];
NSLog(@"%ld",index);
//遍歷數組
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