这是怎么啦？界面不刷新！！

[zby2008]

求助！
storyboard 中 布置了两个viewcontroller界面，暂且分别叫A界面和B界面，它们之间使用 storyboard segue 链接方式（shou push），其中A界面为首界面。
实现功能是：当接收到网络命令时，刷新A界面里面的按钮排布、显示或者隐藏。
问题是：刚打开app时，仅在首页时，网络命令接收到后都能自动更新A界面的布局，一旦点击进入到B界面后再回到A界面，之后收到的网络命令，A界面不再能自动更新排布了！？

以上，求解，望大神赐教新手！

[xttxqjfg]

上代码看看吧 刷新UI建议放在主线程。。

[zby2008]

// // ViewController.m // test // // Created by z on 2017/3/28. // Copyright © 2017年 test. All rights reserved. // #import "ViewController.h" #import "GCDAsyncUdpSocket.h" #import <ifaddrs.h> #import <arpa/inet.h> @interface ViewController () <GCDAsyncUdpSocketDelegate> @property (weak, nonatomic) IBOutlet UIButton *open; @property (weak, nonatomic) IBOutlet UIButton *close; @property (weak, nonatomic) IBOutlet UIButton *op; @property (weak, nonatomic) IBOutlet UIButton *opclose; @end @implementation ViewController static BOOL bsw = false; GCDAsyncUdpSocket * udpSocket = nil; static NSNotificationCenter *center = nil; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. // if (center == nil) { center = [NSNotificationCenter defaultCenter]; [center addObserver:self selector:@selector(msgSW:) name:@"msgSW" object:nil]; } // socket init if(udpSocket == nil){ udpSocket = [[GCDAsyncUdpSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_main_queue()]; NSError * error = nil; [udpSocket bindToPort:5678 error:&error]; if (error) { NSLog(@"udpsocket error:%@",error); }else { [udpSocket beginReceiving:&error]; [udpSocket enableBroadcast:YES error:&error]; NSLog(@"udpsocket ok %@:%i",[self deviceIPAdress],5678); } } } - (void) msgSW:(NSNotification *) notificaion { if (bsw) { bsw = false; self.open.hidden = true; self.close.hidden = true; self.op.hidden = false; self.opclose.hidden = false; }else{ bsw = true; self.open.hidden = false; self.close.hidden = false; self.op.hidden = true; self.opclose.hidden = true; } } - (IBAction)Hide:(id)sender { if (bsw) { bsw = false; self.open.hidden = true; self.close.hidden = true; self.op.hidden = false; self.opclose.hidden = false; }else{ bsw = true; self.open.hidden = false; self.close.hidden = false; self.op.hidden = true; self.opclose.hidden = true; } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - GCDAsyncUdpSocket delegate -(void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext { //data就是接收的数据 unsigned char var; if (data.length == 1) { [data getBytes:&var length:1]; [center postNotificationName:@"msgSW" object:nil]; NSLog(@"get=%d",var); } } - (NSString *)deviceIPAdress { NSString *address = @"an error occurred when obtaining ip address"; struct ifaddrs *interfaces = NULL; struct ifaddrs *temp_addr = NULL; int success = 0; success = getifaddrs(&interfaces); if (success == 0) { // 0 表示获取成功 temp_addr = interfaces; while (temp_addr != NULL) { if( temp_addr->ifa_addr->sa_family == AF_INET) { // Check if interface is en0 which is the wifi connection on the iPhone if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) { // Get NSString from C String address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)]; } } temp_addr = temp_addr->ifa_next; } } freeifaddrs(interfaces); return address; } @end

[scribbler]

没看到进入B界面的东西

[zby2008]

引用 3 楼 scribbler 的回复:

没看到进入B界面的东西

进入b界面的事storyboard界面可视化设置的，无限代码关联。 盼高手解答！

[a649309]

-(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; //按需+判断试试 [self.view setNeedsDisplay]; }

[zby2008]

显示流程和测试流程我再具体描述下： app启动----->首页A界面（接收网络命令，能正常隐藏或者显示界面上的按钮布局）---->按跳转到B界面按钮----->进入了B界面---->在B界面按返回按钮----->回到A界面----->在A界面（接收到网络命令“隐藏或者显示界面上的按钮”，但不见命令有效，界面不见刷新，看不到按钮被隐藏或者显示的变化，打了断点，代码执行进入均正常，就不见界面刷新）。

[_逍遥]

遇到这种怪异的问题，很可能是xib或者storybord的问题，建议删了重建试试