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Objective-C的数组比C++，Java的数组强大在于，NSArray保存的对象可以是不同的对象。但只能保存对象，int ,char,double等基本数据类型不能直接保存，需要通过转换成对象才能加入数组。
1、NSArray 不可变数组
[array count] : 数组的长度。
[array objectAtIndex 0]: 传入数组脚标的id 得到数据对象。
[arrayWithObjects; ...] :向数组对象初始化赋值。这里可以写任意对象的指针,结尾必须使用nil。
1.1、创建数组
1、创建数组
| NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil]; |
2、数组所包含对象个数
| [self.dataArray count] |
3、获取指定索引处的对象
| [self.dataArray objectAtIndex:2] |
4、从一个数组拷贝数据到另一数组(可变数级)
| //arrayWithArray: //NSArray *array1 = [[NSArray alloc] init]; NSMutableArray *MutableArray = [[NSMutableArray alloc] init]; NSArray *array = [NSArray arrayWithObjects: @"a",@"b",@"c",nil]; NSLog(@"array:%@",array); MutableArray = [NSMutableArray arrayWithArray:array]; NSLog(@"MutableArray:%@",MutableArray); array1 = [NSArray arrayWithArray:array]; NSLog(@"array1:%@",array1); |
5、COPY
| NSMutableArray *newArray = [[NSMutableArray alloc] init]; NSArray *oldArray = [NSArray arrayWithObjects: @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil]; NSLog(@"oldArray:%@",oldArray); for(int i = 0; i < [oldArray count]; i++) { obj = [[oldArray objectAtIndex:i] copy]; [newArray addObject: obj]; } // NSLog(@"newArray:%@", newArray); [newArray release]; |
6、深COPY
| //NSMutableArray *newArray = [[NSMutableArray alloc] init]; NSArray *oldArray = [NSArray arrayWithObjects: @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil]; NSLog(@"oldArray:%@",oldArray); newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers); NSLog(@"newArray:%@", newArray); [newArray release]; |
7、快速枚举
| //NSMutableArray *newArray = [[NSMutableArray alloc] init]; NSArray *oldArray = [NSArray arrayWithObjects: @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil]; NSLog(@"oldArray:%@",oldArray); for(id obj in oldArray) { [newArray addObject: obj]; } // NSLog(@"newArray:%@", newArray); [newArray release]; |
8、切分数组
| NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"]; NSLog(@"string:%@",string); NSArray *array = [string componentsSeparatedByString:@","]; NSLog(@"array:%@",array); [string release]; |
9、从数组合并元素到字符串
| NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil]; NSString *string = [array componentsJoinedByString:@","]; NSLog(@"string:%@",string); |
10、 给数组分配容量
| array = [NSMutableArray arrayWithCapacity:20]; |
11、 在数组末尾添加对象
| NSMutableArray *array = [NSMutableArray arrayWithObjects:@"One",@"Two",@"Three",nil]; [array addObject:@"Four"]; NSLog(@"array:%@",array); |
12、删除数组中指定索引处对象
| NSMutableArray *array = [NSMutableArray arrayWithObjects:@"One",@"Two",@"Three",nil]; [array removeObjectAtIndex:1]; NSLog(@"array:%@",array); |
Objective-C语法之NSArray和NSMutableArr
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原文地址：http://www.cnblogs.com/ianhao/p/4418290.html
