我正在研究扫描wi-fi网络的应用程序并列出ip列表和连接的设备。
我尝试通过创建两个新的对象属性ip4thOctet和ip3thOctet来对ip列表进行排序,并在依赖它们之后进行排序。
@property (nonatomic, assign) NSInteger ip4thOctet;
@property (nonatomic, assign) NSInteger ip3thOctet;
和:
-(NSInteger)ip4thOctet {
if (self.ipAddress) {
return [[[self.ipAddress componentsSeparatedByString:@"."] lastObject] intValue];
}
return 0;
}
-(NSInteger)ip3thOctet {
if (self.ipAddress) {
NSInteger elements = [[self.ipAddress componentsSeparatedByString:@"."] count];
return [[[self.ipAddress componentsSeparatedByString:@"."] objectAtIndex:elements-1] intValue];
}
return 0;
}
基于这些属性,我试图对数组进行排序:
-(void)lanScanDidFindNewDevice:(Device*)device {
if (![connectedDevicesMutable containsObject:device]) {
[connectedDevicesMutable addObject:device];
}
self.connectedDevices = [NSMutableArray arrayWithArray:connectedDevicesMutable];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"ip4thOctet"
ascending:YES
selector:@selector(compare:)
];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
self.connectedDevices = [self.connectedDevices sortedArrayUsingDescriptors:sortDescriptors];
NSSortDescriptor *sortDescriptor3thIpOctect = [[NSSortDescriptor alloc] initWithKey:@"ip3thOctet"
ascending:YES
selector:@selector(compare:)
];
NSArray *sortDescriptors3th = [NSArray arrayWithObject:sortDescriptor3thIpOctect];
self.connectedDevices = [self.connectedDevices sortedArrayUsingDescriptors:sortDescriptors3th];
}
客户预期结果如下:
预期:
172.17.0.1
172.17.0.2
172.17.1.1
172.17.1.3
172.17.3.1
你能帮我按照客户的期望对ip列表进行排序吗?
目前的结果是:
172.17.0.1
172.17.1.1
172.17.3.1
172.17.0.2
172.17.1.2
172.17.0.3
172.17.1.3
答案 0 :(得分:1)
objectAtIndex:elements-1
中的ip3thOctet
您正在访问最后一个元素(从0开始计数)。所以你们都要为最后一个元素排序。您应该使用elements-2
。