IOS學習筆記2015-03-20OC-集合-數組

2019-11-14 19:24:17

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[NSArray]一 定義1  不可變數組2 oc中數組的元素可以是任何對象  3 數字中裝有元素的地址 二 初始化NSArray *變量 = [[NSArry alloc] initWithObjects:對象...,nil];三 使用場景1 遍歷數組 A 枚舉 NSEnumerator *enums = [array1 objectEnumerator];  while (obj=[enums nextObject]) B 下標 for (i=0;i<count;i++) {C 快速枚舉法for(id obj in array1)2 獲取長度int count = [數組對象 count];[NSMutableArray]一 定義1 可變數組2 可以插入任意對象二 初始化NSMutableArray *變量名 = [[NSMutableArray alloc] init];三 使用場景1 增加對象[mutableArray addObject:@"JACK"];2 下標替換對象[mutableArray exchangeObjectAtIndex:0 withObjectAtIndex:2];3 移除對象 [mutableArray removeObject:person];   [mutableArray removeObjectAtIndex:0];4 順序枚舉遍歷  NSEnumerator *_enums = [mutableArray objectEnumerator];5 倒序枚舉遍歷   NSEnumerator *_reverseEnums = [mutableArray reverSEObjectEnumerator];6 字符串和數組的轉換  NSArray *_strArray = [str componentsSeparatedByString:@" "];  NSString *str = [_strMutableArray componentsJoinedByString:@" "];

////  main.m//  OC-數組////  Created by wangtouwang on 15/3/20.//  Copyright (c) 2015年 wangtouwang. All rights reserved.//#import <Foundation/Foundation.h>#import "Person.h"int main(int argc, const char * argv[]) {    @autoreleasepool {        // 不可變數組 NSArry        NSLog(@"NSArry");        Person *person = [Person new];        person._name=@"JACK";                //初始化        NSArray *array1 = [[NSArray alloc] initWithObjects:@"jack",@"lucy",person, nil];        NSLog(@"%@",array1);                //枚舉        NSLog(@"枚舉器法打印數組結果:");        NSEnumerator *enums = [array1 objectEnumerator];        id obj;        while (obj=[enums nextObject]) {            NSLog(@"%@",obj);        }                //快速枚舉         NSLog(@"快速枚舉法打印數組結果:");        for(id obj in array1){            NSLog(@"%@",obj);        }                //下標便利        NSInteger i = 2;        id obj2 = [array1 objectAtIndex:i];        NSLog(@"%@",obj2);                //獲取長度        NSInteger count=[array1 count];        NSLog(@"數組長度 %lu",count);        i=0;        for (i=0;i<count;i++) {            NSLog(@"%@",[array1 objectAtIndex:i]);        }                //可變數組 NSMutableArray                NSMutableArray *mutableArray  = [[NSMutableArray alloc] init];        //增加        [mutableArray addObject:@"JACK"];         [mutableArray addObject:@"MOBILE"];         [mutableArray addObject:@"TEL"];        [mutableArray addObject:@"BOOK"];        [mutableArray addObject:@"STUDENT"];        [mutableArray addObject:person];        NSLog(@"%@",mutableArray);                //替換對象         NSLog(@"替換對象");        [mutableArray exchangeObjectAtIndex:0 withObjectAtIndex:2];         NSLog(@"%@",mutableArray);                //移除對象 參數 id類型        NSLog(@"移除對象 參數 id類型");        [mutableArray removeObject:person];         NSLog(@"%@",mutableArray);        //移除對象 參數 NSInteger          NSLog(@"移除對象 參數 NSInteger");        [mutableArray removeObjectAtIndex:0];         NSLog(@"%@",mutableArray);                //正序枚舉遍歷         NSLog(@"正序枚舉遍歷");        NSEnumerator *_enums = [mutableArray objectEnumerator];        id obj3;        while (obj3=[_enums nextObject]) {             NSLog(@"%@",obj3);        }        //倒序枚舉遍歷  并且可以遍歷時刪除         NSLog(@"倒序枚舉遍歷 并且可以遍歷時刪除");        NSEnumerator *_reverseEnums = [mutableArray reverseObjectEnumerator];        while (obj3=[_reverseEnums nextObject]) {             NSLog(@"%@",obj3);            [mutableArray removeObject:obj3];        }        NSLog(@"倒序枚舉遍歷結束 查看數組長度 %lu",[mutableArray count]);                //字符串和數組的轉換        NSString *str = @"hello world hao are you";        NSArray *_strArray = [str componentsSeparatedByString:@" "];        NSLog(@"lenght = %lu",[_strArray count]);                NSMutableArray *_strMutableArray = [[NSMutableArray alloc] init];        NSEnumerator *_strEnums = [_strArray reverseObjectEnumerator];        NSString *objstring ;        while (objstring=[_strEnums nextObject]) {            [_strMutableArray addObject:objstring];        }       NSLog(@"%@",_strMutableArray);                str = [_strMutableArray componentsJoinedByString:@" "];        NSLog(@"%@",str);    }    return 0;}