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objective-c对NSArray的学习


艰难的开始,学习IOS 开发。 NSARRAY简单的使用

定义数组,遍历数组:

    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:

    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:

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

可变数组:

    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]);
    }

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