/* 初始化方法:
1.init返回一个空数组 2.initWithArray从已有数组初始化 3.initWithContentsOfFile//从plist文件加载 4.initWithContentsOfUrl//从网络地址上获取 5.initWithObject用一个对象初始化 6.initWithObjects从多对象初始化 self.theDataArray=[[NSMutableArray alloc]initWithCapacity:5];//指定有五个元素初始化 */ /*打印第一个元素: NSLog(@"the object is:%@",[theDataArray firstObjectCommonWithArray:theDataArray]); */ /*打印最后一个元素: NSLog(@"the object is:%@",[theDataArray lastObject]); */ /*枚举所有元素,方法一: for (NSString * theStr in theDataArray) { NSLog(@"%@:",theStr); } */ /*枚举所有元素,方法二: for (int i=0,i<[theDataArray count],i++) { //NSLog(@"%@:",[theDataArray objectAtIndex:i]); } */ /* 枚举所有元素,方法三,用枚举器: NSEnumerator *enumerator=[theDataArray objectEnumerator]; id obj; while (obj =[enumerator nextObject]) { NSLog(@"%@",obj); } */ /* //添加元素 [theDataArray addObject:@"这是新添加的元素"];//从最后开始添加 */ /* //从指定索引插入元素 [theDataArray insertObject:@"this is inerted object" atIndex:0];//是插入到指定 索引的前面 */ /* //修改.更新元素 [theDataArray replaceObjectAtIndex:0 withObject:@"new obj"];//指定索引修改 */ /* //判断数组是否包含某个对象 if ([theDataArray containsObject:@"selectiont"]) { NSLog(@"the object selection is contained in array"); } else{ NSLog(@"not contain"); } */ /* //获取元素索引 NSLog(@"the idx is:%i",[theDataArray indexOfObject:@"selection"]); */ /*//数组元素排序 方法一: NSArray *theTempArr=[[NSArray alloc] initWithArray:[theDataArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]]; */ //[theDataArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]; // or @selector(compare:) /*//数组元素排序 方法二: NSLog(@"before sorted array:%@",theDataArray); NSCountedSet *cset=[[NSCountedSet alloc] initWithArray:theDataArray]; NSArray *theTempArr=[[NSArray alloc] initWithArray:[[cset allObjects]sortedArrayUsingSelector:@selector(compare:)]]; NSLog(@"after sorted array:%@",theTempArr); */ /* //对数组对象进行排序 NSSortDescriptor NSSortDescriptor *sortDescriptor=[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];//@“name”是对象属性 [theDataArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];//返回排序好的数组 //还可以用自定义方法:[theDataArray sortUsingSelector:@selector(custom Method:)];-(NSInteger)customMethod:(someObject *)otherObj{ NSCompareResult compareResult=[self.name compare:otherObj.name]; if(compareResult == NSOrderedSame) return 0;if(compareResult == NSOrderedAscending) return 1; else return -1;}*//* //对象数组过滤(NSPredicate)NSArray *keyArray=[[NSArray alloce]initWtihObjects:@"A",@"B",nil]; for (NSString *key in keyArray) { //定义规则: NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"SELF.name beginswith[c] %@",key]; //SELF.name是对象属性,beginswith[c] %@",key 表示选出name以key开头的对象 //或者 :NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"SELF.name contains [c] %@",key]; //contains[c] %@",key 表示选出name中包含有key的对象 //或者 :NSInteger age=20;NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"SELF.age > %i",age]; // 表示选出age>20的对象 //或者 :NSString * matchStr=@"hel*";NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"SELF.name like %@",matchStr]; // 表示选出name中包含与字符串matchStr相似的对象 NSArray *newArr=[theDataArray filteredArrayUsingPredicate:apredicate]; [theDataDict setValue:newArr forKey:key]; }*//* //删除数组元素NSMutableArray *tempArray=[[NSMutableArray alloc]initWithObjects:@"one",@"tow",@"threr",nil]; [tempArray removeObjectAtIndex:0];//从指定索引移除 [tempArray removeAllObjects];//移除所有元素 [tempArray removeLastObject];//移除最后那个元素 [tempArray removeObjectsInArray:newArray];//移除指定数组中元素 [tempArray removeObjectsAtIndexes: NSIndexSet *__strong)];//从所选择的索引中移除*/