objective-c对NSArray的学习

转自：http://gekie.iteye.com/blog/1086256

ＮＳＡＲＲＡＹ简单的使用

定义数组，遍历数组：

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NSArray *array; array = [NSArray arrayWithObjects:@"one", @"two", @"three", @"four",nil];   int i; for(i = 0; i < [array count]; i++) { NSLog(@"index %d has %@.",i,[array objectAtIndex:i]); }

切分字符串：

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NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];   // insert code here... NSString *string = @"oop:ack:bork:greeble:ponies";   NSArray *array = [[[NSArray array] init] autorelease]; // array = [NSArray arrayWithObjects:@"one", @"two", @"three", @"four",nil];   array = [string componentsSeparatedByString:@":"];   int i; for(i = 0; i < [array count]; i++) { NSLog(@"index %d has %@.",i,[array objectAtIndex:i]); }

合并数组：

1 2	NSArray *array1 = [NSArray arrayWithObjects:@"1", @"2", @"3", nil]; NSString *joinedString = [array1 componentsJoinedByString:@","];

可变数组：

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NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];   array = [NSMutableArray arrayWithCapacity: 17];   int i;   for(i = 0; i < 4; i++) { [array addObject:@"aaa"]; NSLog(@"hello %d %@",i, [array objectAtIndex:i]); }