oc數組基本操做

[self.historyData containsObject:textField.text] //判斷是否在數組內部
[self.historyData exchangeObjectAtIndex:[self.historyData indexOfObject:textField.text] withObjectAtIndex:0];
//替換某一個數組
[self.historyData insertObject:textField.text atIndex:0];//插入到某個位置
[[oldKey reverseObjectEnumerator] allObjects] //數組倒敘
 
NSRange range = NSMakeRange(0, 20);
self.localKeyWord = (NSMutableArray *)[readyArr subarrayWithRange:range]; //數組截取

[collectionArr indexOfObject:someObject]; //數組所在位置

---

containObject:(nsobject*)object  //數組存不存在

---

//不可變數組變成 可變數組

 NSArray * title =  @[@"省份",@"城市",@"區/縣"];

[self.cartAddressInfoModel.titleArr addObjectsFromArray:title];

---

 

//替換數組

[index.selectArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        if (obj == listArray[indexPath.row]) {
            *stop = YES;
            if (*stop == YES) {
                [index.selectArray removeObject:obj];
            }
        }
        if (*stop) {
            YLLog(@"array is %@",index.selectArray);
        }
    }];
===========================
 for (NSString *key in keyNewArrays) {
                [dictArr addObject:[NSString stringWithFormat:@"%@=%@",key,dict[key]] ];
                if([key isEqualToString:@"secret"]){
                    [dictArr replaceObjectAtIndex:i withObject:[NSString stringWithFormat:@"%@=%@",key,kHttpSecret]];
                }
                i++;
            }