2 starwar2012 starwar2012 于 2013.04.07 15:27 提问

ios中传递CGpoint 结果错误

需要发送CGpoint 到主类中。使用了Notification,但是不知在接受端如何从Notification中提取出CGpoint。在log输出的结果是0.0

代码
发送:

 NSValue *pointAsObject =[NSValue valueWithCGPoint:CGPointMake(touchDetectingView.lastTouchPosition.x, touchDetectingView.lastTouchPosition.y)];
  [[NSNotificationCenter defaultCenter] postNotificationName: @"swap" object:pointAsObject];

接收端 Header 文件:

- (void)incomingNotification:(NSNotification *)notification;

接受端 M 文件:

[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(incomingNotification:) name:@"swap" object:nil];

- (void)incomingNotification:(NSNotification *)notification
{
     NSValue *pointAsObject = [[notification userInfo] valueForKey:@"swap"];
    NSLog (@"Successfully received the test notification %f",pointAsObject.CGPointValue.y);
}

1个回答

vieri_ch
vieri_ch   2013.04.07 16:17
已采纳

请看黑体字,你应该放到userinfo里传递,post的时候,而不是通过object传递

NSValue *pointAsObject =[NSValue valueWithCGPoint:CGPointMake(touchDetectingView.lastTouchPosition.x, touchDetectingView.lastTouchPosition.y)];
NSDictionary *dict = [NSDictionary dictionaryWithObject:pointAsObject
                                                      forKey:@"point"];
[[NSNotificationCenter defaultCenter] postNotificationName: @"swap" object:self userinfo:dict];* ** 

接收并处理消息

- (void)incomingNotification:(NSNotification *)notification
{
          NSValue *pointAsObject = [[notification userInfo] valueForKey:@"point"];
        NSLog (@"Successfully received the test notification %f",pointAsObject.CGPointValue.y);
}
Csdn user default icon
上传中...
上传图片
插入图片
准确详细的回答,更有利于被提问者采纳,从而获得C币。复制、灌水、广告等回答会被删除,是时候展现真正的技术了!